#linuxcnc | Logs for 2012-02-25

[00:00:10] <pfred1> basically it is how many step pulses your machine thnks it needs to move a unit measure
[00:00:20] <pfred1> yours sounds about half off to me
[00:05:37] * pfred1 just loaded up drill.py here
[00:05:52] <pfred1> I need to learn Python
[00:06:26] <Tom_itx> i need to learn it a bit too
[00:07:09] <pfred1> looking at the source it is a rather introspective language
[00:07:24] <pfred1> seems to keep on mentioning "self" an awful lot
[00:07:57] <pfred1> http://wiki.linuxcnc.org/uploads/drill.py
[00:08:11] <Thetawaves> self is similar to this in C++
[00:08:51] <pfred1> http://www.douglas-self.com/
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[00:09:45] <pfred1> any algebra wizards here?
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[00:10:52] <pfred1> I have this equation π X Dia. X RPM / 12 = SFPM
[00:11:27] <pfred1> but I usually know what SFPM I want and what Dia. I am running too so I usually need to solve it for RPM
[00:11:30] <Thetawaves> something is weird about that equation
[00:12:23] <pfred1> so I made up this equation SFPM / (π X (Dia. / 12)) = RPM
[00:12:35] <pfred1> it works but it is a pain to calculate
[00:12:40] <Thetawaves> what is x?
[00:12:47] <pfred1> times
[00:13:22] <Thetawaves> SFPM / (* (Dia. / 12)) = RPM?
[00:13:30] <Thetawaves> seems i am missing a symbol
[00:13:43] <pfred1> oh you can't see π ?
[00:14:12] <Thetawaves> you should use utf8 as your character set
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[00:14:23] <alex4nder> looks good here
[00:14:25] <pfred1> I am
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[00:14:51] <pfred1> alex4nder you can see the PI symbol?
[00:15:27] <alex4nder> yah
[00:15:28] <Thetawaves> pfred1, here is a simpler equation
[00:15:34] <Thetawaves> there*
[00:15:38] <pfred1> Thetawaves that is what I was thinking
[00:16:15] <pfred1> PI X Dia. X RPM / 12 = SFPM
[00:16:22] <Thetawaves> cutting speed * 4 / D
[00:16:32] <pfred1> no that is inaccurate
[00:16:43] <Thetawaves> ohhh
[00:16:56] <pfred1> my mill is pretty picky about its surface speeds
[00:17:21] <Tom_itx> is it tough to scan a file for a string in python?
[00:17:56] <pfred1> seems more a perlish thing to do
[00:18:05] <Thetawaves> load the file into a string and do a string search?
[00:19:31] <pfred1> didn't Nebraska try to legislate PI = 4 once?
[00:19:48] <pfred1> one of them backwards western states
[00:19:59] <Thetawaves> rpm = (sfpm * 12) / (dia * pi) ?
[00:20:21] <pfred1> http://en.wikipedia.org/wiki/Indiana_Pi_Bill
[00:22:48] <Thetawaves> or really rpm = sfpm * (12/ (dia * pi))
[00:23:25] <pfred1> Thetawaves that would be a lot easier to solve
[00:23:57] <Thetawaves> or actually rpm = sfpm * ( 3.819 / dia)
[00:24:10] <Thetawaves> calculate the 3.819 number to your desired descimal places via 12/pi
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[00:25:25] <Thetawaves> run your numbers and let me know if that actually works
[00:25:33] * Thetawaves *thinks* he can do algebra
[00:25:47] <pfred1> yeah that was what I had to do for the formula I made
[00:26:30] <pfred1> I know PI X DIA. X RPM / 12 = SFPM works
[00:26:52] <Thetawaves> any of those three i supplied should also work
[00:27:08] <pfred1> so when my other formula joved with its results i knew it worked but it seems it could be simplified to me
[00:27:51] <pfred1> I'll try rpm = sfpm * ( 3.819 / dia)
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[00:28:41] <AitalMAC> It's possible to set a spindle with PWM or PDM with acceleration and decelleration?
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[00:30:23] <Thetawaves> pfred1, success?
[00:31:39] <pfred1> Thetawaves donno haven't tried it yet will soon
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[00:32:56] <pfred1> Thetawaves it is pretty close
[00:33:21] <pfred1> just the difference in how many decimal places 3.819 is
[00:33:28] <Thetawaves> add some more digits to your 3.819
[00:33:40] <pfred1> Thetawaves then it gets harder to use
[00:33:50] <Thetawaves> it would be handy to keep that in one of the memory slots on your calculator
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[00:34:34] <Thetawaves> just remember to save 12/pi before you start your session :)
[00:35:02] <pfred1> I got 1739.6726
[00:35:19] <pfred1> when the actual value was 1740
[00:37:24] <Thetawaves> nahhhh
[00:37:29] <pfred1> now I get 1739.9999 if I do 12/PI first
[00:37:31] <Thetawaves> the 'actual value' is some rounding
[00:37:50] <Thetawaves> 1739.6726???? pfffff 1740 good enough
[00:37:54] <pfred1> pft I never get the exact RPM out of my mill anyways
[00:37:56] <Thetawaves> :)
[00:38:43] <pfred1> I used to hunt wiht the different speeds to figure out which one I should run was a pain
[00:39:39] <pfred1> then one day I had the bright idea to write the speeds into my endmill box
[00:39:47] <pfred1> that saved me a lot of time
[00:40:01] <Thetawaves> if you only cut one material?
[00:40:10] <pfred1> but not every tool I own is in a box and yes that is the other issue too
[00:40:24] <pfred1> mostly it matters when I mill steel
[00:40:42] <pfred1> other stuff I can be off on the speed and it isn't the end of the world or the tool I'm using
[00:40:48] <Thetawaves> so you only have the calcs for steel?
[00:41:08] <Thetawaves> thanks for the tip
[00:41:29] <pfred1> well if you have the steel speeds yo ucan sort of figure for softer materials
[00:41:44] <pfred1> figure double or triple it depending
[00:42:25] <pfred1> softer than steel I think the general rule is if there ain't fire gouting out you're good to go
[00:42:55] <Jymmm> This is kinda creepy http://i42.tinypic.com/2rwvzeq.jpg
[00:42:57] <Jymmm> (if it's true that is)
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[00:43:15] <Thetawaves> i bet my microstepping setting is messing up my axis scale
[00:43:23] <Thetawaves> test axis functions perfectly
[00:43:31] <pfred1> Thetawaves it is one of the factors for your axis scale figure
[00:43:49] <pfred1> if you double it you should be spot on
[00:44:03] <pfred1> your 2.5 will turn into a 5
[00:44:08] <Thetawaves> i have it set to 1
[00:44:10] <Thetawaves> should set to 0
[00:44:17] <pfred1> so you're half stepping then?
[00:44:31] <pfred1> 1 is full stepping
[00:44:48] <pfred1> I don't think there is a 0
[00:45:17] <Thetawaves> i don't really know what i should set there, i don't think my driver does any microstepping
[00:45:18] <pfred1> 2 is half stepping 4 quad etc
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[00:45:35] <pfred1> full stepping is prety horrible
[00:45:54] <Thetawaves> so set it to 2?
[00:46:06] <pfred1> I've run in full step mode it is how can I put it? limiting
[00:46:08] <pfred1> yes
[00:46:25] <pfred1> half stepping is about the minimum i can stomach
[00:47:36] <pfred1> Thetawaves what kind of driver do you have?
[00:49:29] <Thetawaves> noname chinese
[00:49:40] <pfred1> what IC is it based on?
[00:49:49] <Thetawaves> i'll have to open it up tonight
[00:50:10] <pfred1> it doesn't even say what it is?
[00:50:21] <pfred1> is it a TB6560?
[00:50:21] <Thetawaves> i set it up to do half stepping, now the test area definitely moves 8mm in total when i told it 4mm
[00:50:34] <Thetawaves> i have a feeling emc2 will move 5mm when i tell it to now however
[00:51:08] <Thetawaves> there are no numbers on the outside of the box
[00:51:24] <pfred1> got a link with a pic of the board?
[00:51:50] <pfred1> thoug hthe old SLAs and the TB do kind of look alike from a distance
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[00:52:06] <pfred1> and the old toshibas look like the new one too
[00:53:24] <pfred1> if it is a cheapie multi axis Chinese board odds are it is a TB based driver
[00:54:01] <pfred1> lets hope they didn't saddle you with an old TA board
[00:54:16] <pfred1> they're still floating around though
[00:55:54] <Thetawaves> http://www.amonstar.com/template/file/3020/desktop-CNC%20user%20manual.doc
[00:56:02] <Thetawaves> thats got some detail pictures
[00:56:14] <Thetawaves> a ton of the connectors are different though
[00:56:38] <Thetawaves> i'll open it up now
[00:57:07] <pfred1> your machine came with Mach3?
[00:57:57] <pfred1> hmm yeah they're not being entirely forthcoming about what exact drivers you have
[00:58:05] <pfred1> they might be old TAs
[00:58:41] <pfred1> which with the right freewhelling diodes I guess there is nothing wrong with them
[00:59:36] <Thetawaves> i took the cover off and the main ICs are on the bottom of the board
[00:59:43] <Thetawaves> only the optos on top
[01:00:18] <pfred1> I wonder what this one chinese character means?
[01:00:40] <pfred1> it probably means i run to casino with roud eye's money or something
[01:01:27] <pfred1> Thetawaves the mach3 your machine came with is the limited trial version?
[01:01:37] <Thetawaves> no idea
[01:01:42] <Thetawaves> i assume it is a hacked version
[01:01:44] <pfred1> you never ran it?
[01:01:50] <Thetawaves> i don't own windows
[01:01:51] <pfred1> that was just what I was thinking
[01:02:16] <pfred1> if it came from China they have some kind of a moral obligation to crack western commercial software or something
[01:02:58] <Thetawaves> it would make the machine pretty much useless to a huge market
[01:03:03] <Thetawaves> without mach3
[01:03:07] <pfred1> everyone is all hot to trot on mach land because mach doesn't support win7 or some such nonsense
[01:03:48] phantone is now known as phantoxe
[01:03:58] <pfred1> closed source makes about as much sense as dinosaurs staring at comets
[01:04:09] <Thetawaves> pfred1, you want me to send you the exe?
[01:04:14] <pfred1> in the long run it is about as survivable too
[01:04:14] <Thetawaves> beware, there be sharks
[01:04:30] <pfred1> I can't DCC firewalled
[01:05:02] <Thetawaves> you probably don't want to run shady chinese exes anyway
[01:05:10] <pfred1> ya gotta say the chinese language sure is pretty in print
[01:05:34] <pfred1> I seen pics of their small keyboards though
[01:05:47] <pfred1> you know the ones with only about 2,500 keys?
[01:06:05] <pfred1> gotta be murder to touch type on
[01:06:34] <Thetawaves> no
[01:06:52] <Thetawaves> each character is like 3 keys pressed together
[01:06:57] <Thetawaves> or something
[01:07:05] <Thetawaves> there is an encoding scheme
[01:07:16] <pfred1> we got nothing to worry about from over there!
[01:07:43] <pfred1> least ways not until they give up that chicken scratch they pass off as text
[01:08:51] <pfred1> their Internet is freaky too you ever check it out?
[01:09:34] <Thetawaves> no
[01:09:35] <pfred1> not to say that our Internet is wrapped too tightly but theirs is really bizarre
[01:10:48] <pfred1> lets just say that as a culture they fixate an awful lot
[01:12:38] <pfred1> if one Chinese person is into something you can bank on a half a billion of them being into the same thing
[01:13:33] <pfred1> and when they go in they go all in
[01:14:25] * pfred1 wonders what the Chinese translation for rugged individualist is ....
[01:15:06] <pfred1> probably political prisoner or something to that effect
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[01:19:01] <pfred1> Chinglish is a riot!
[01:19:09] <pfred1> Notice:
[01:19:16] <pfred1> 2. You’d better use the PC to control the machine, especially for this machine and do not install other software if conditions permit.
[01:19:38] <pfred1> Valen you hear that? You'd better!
[01:20:46] <pfred1> what scares me is when I read too much of it and it starts making sense
[01:25:12] <pfred1> Thetawaves EMC2 is listed as acceptable software for your machine
[01:28:01] <pfred1> Thetawaves all your motor settings are on page 14
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[01:33:59] <Valen> if its a chinese controller they are probably wrong
[01:34:16] <pfred1> Valen come on they got it to work
[01:34:24] <pfred1> http://www.newegg.com/Product/Product.aspx?Item=N82E16856119041
[01:34:28] <pfred1> hawt!
[01:34:29] <Valen> there are like 3 different similar controllers that most of the chinese "mills" use
[01:34:49] <Valen> and they all copy the instructions from some other different controller that has a different pinout
[01:34:56] <pfred1> heh
[01:35:03] <pfred1> this was a software setup page
[01:35:08] <Valen> not that i'm generalising
[01:35:24] <Valen> yeah they have info to put into stepconf, thats just wrong info
[01:35:29] <Valen> but good luck
[01:35:31] <pfred1> Foxconn SFF R50-D4 Intel Atom D525 (1.8GHz, Dual-core) Intel NM10 Intel GMA 3150 Barebone $109.99
[01:35:33] <Valen> you might get lucky
[01:35:52] <Valen> i want quad core atoms!
[01:36:12] <pfred1> how come?
[01:36:25] <pfred1> one core for OS one for RTAI
[01:36:39] <Valen> more cores for OS
[01:36:42] <Valen> gets kinda laggy
[01:36:43] <pfred1> why?
[01:36:53] <pfred1> shouldn't
[01:37:06] <pfred1> what are you doing ripping movies while you're cutting?
[01:37:07] <Valen> webcam often uses 100% cpu
[01:37:24] <pfred1> why are you running a webcam with your CONC controller?
[01:37:29] <pfred1> CNC controller even
[01:38:02] <Valen> alignment camera
[01:38:58] <Valen> http://www.cnczone.com/forums/attachment.php?attachmentid=143600&amp;d=1318136270
[01:39:09] <Valen> from http://www.cnczone.com/forums/1004601-post29.html
[01:39:17] <Valen> the camera is off to the left of that image
[01:39:37] <pfred1> too advanced for me I just use stop blocks
[01:39:41] <Valen> and here it is integrated into emc http://www.cnczone.com/forums/attachment.php?attachmentid=143603&d=1318136270
[01:39:44] <Valen> tis easy
[01:40:40] <Valen> but yeah, more cores would be handy when your doing stuff other than cutting
[01:40:53] <pfred1> that is what I have other PCs for
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[01:41:22] <pfred1> my CNC box is dedicated to task
[01:41:39] <Valen> i use it for everything in the shop except the radio ;->
[01:41:46] * pfred1 pulled it out of that trash heap special!
[01:42:04] <pfred1> nope i have a separate PC in my garage for other nonsense
[01:42:36] <Valen> i often use stuff i find on the interweb for cutting with ;->
[01:42:41] <Valen> looking up feeds n speeds
[01:43:37] <pfred1> I just got a Starret catalog in a thrift store has spme feeds and speed tables in it
[01:43:53] <pfred1> cost me a quarter
[01:44:49] <pfred1> I just bought a tool last weekend I always wanted
[01:44:58] <pfred1> never thought I'd ever get one either
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[01:46:16] <Valen> hrm?
[01:46:32] <pfred1> I got a left handed circular saw
[01:46:51] <pfred1> they're pretty rare you know?
[01:47:06] <pfred1> I never could justify what they cost either
[01:47:14] <pfred1> even though I'm left handed
[01:47:36] <pfred1> I got to admit is is kind of weird to run a circular saw wiht my left hand now
[01:47:50] <pfred1> I been doing it right handed for so long
[01:48:08] <Valen> lol
[01:48:10] * pfred1 can't mouse with his left hand either ....
[01:49:18] <pfred1> years ago I was like I'm going to learn right handed because there is no way I'm going to be moving mice for the rest of my life
[01:50:41] <pfred1> I think it is because of that that I can't draw on computers though
[01:51:20] <pfred1> and trying to mouse with my left hand feels positively perverse to me today
[01:51:39] * pfred1 has a Wacom though ...
[01:52:06] <pfred1> but it's kind of strange too
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[01:52:53] <pfred1> I almost got it all setup once in Linux with the pressure sensitivity and everything
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[01:54:05] <pfred1> I don't think I ever quite got the eraser to work right though some part of it I couldn't manage to get 100% right
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[02:06:45] <blockbuster> what's a good cnc milling software?
[02:07:21] <pfred1> blockbuster LinuxCNC
[02:07:38] <blockbuster> i don't have a linux.. is there a windows base software?
[02:07:46] <blockbuster> what's a good windows based software?
[02:07:48] <pfred1> blockbuster Linux is free
[02:08:02] <blockbuster> is there a link you can provide?
[02:08:15] <pfred1> http://linuxcnc.org/
[02:08:33] <blockbuster> can it do 4th axis rotary?
[02:08:34] <pfred1> when you download the CD image it comes with the OS
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[02:10:27] <pfred1> blockbuster you mean like this? http://www.youtube.com/watch?v=9Ut4fG6lO80
[02:10:42] <blockbuster> yes
[02:12:15] <blockbuster> can it do 4th axis ??
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[02:13:35] <pfred1> blockbuster you just watched a video what do you think?
[02:13:51] <blockbuster> i like it.. i wan to do something like that. can the software do that?
[02:14:19] <blockbuster> i need a software that converts my stl files to gcode.
[02:14:46] <pfred1> blockbuster why stop at just 4 axises? http://www.youtube.com/watch?v=7WCrqqoZkPg
[02:15:01] <blockbuster> i only have a 4 axis cnc mill
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[02:30:58] <joe9> I love this idea: http://www.instructables.com/id/Accurized-Craftsman-Drill-Press/ , but my drill press quill does not have the metal bracket around it.
[02:31:18] <joe9> Any suggestions on how I can add a vernier calipers to a drill press.
[02:31:55] <joe9> http://www.harborfreight.com/heavy-duty-16-speed-bench-drill-press-38142.html is my drill press.
[02:32:20] <joe9> I am thinking I could attach a round bracket or something like that to the quill.
[02:32:28] <pfred1> this is my drill press http://img535.imageshack.us/img535/8026/millpic.jpg
[02:33:03] <joe9> pfred1: it does seem to have something there.
[02:33:11] <joe9> did you put a calipers too?
[02:33:19] <pfred1> no
[02:33:19] <joe9> or, is it just the depth guage?
[02:33:44] <pfred1> yes if i need to bore a hole to a depth I just take the piece out and measure it
[02:33:56] <pfred1> it doesn't really come up that often
[02:35:28] <pfred1> although if i could get glass scales for the X and Y table I'd do that
[02:35:47] <joe9> pfred1: quick question, Is it possible to get a O ring shaped bracket that I can attach to the quill?
[02:36:00] <joe9> at Home depot ?
[02:36:26] <pfred1> maybe I don't know
[02:36:27] <joe9> I am told that the machinist could help with it, but, I want to see if I could do it with just the home depot stuff.
[02:36:55] <pfred1> lowes seems to have more stuff than home depot
[02:39:28] <pfred1> joe9 this is my secret for how I can unload a piece http://www.instructables.com/id/Vise-Stop/
[02:39:51] <pfred1> pop it out measure pop it right back in
[02:40:51] <Thetawaves> what should i do as a first cut?
[02:41:01] <pfred1> Thetawaves air
[02:41:11] <Thetawaves> of what?
[02:41:18] <pfred1> lots do the logo
[02:41:19] <joe9> pfred1: how does it work? I could not understand it much from the article. let me google "vise stop"
[02:41:49] <pfred1> joe9 you load the piece into the vise bring the stop up to it and lock it down
[02:42:04] <pfred1> then when you open the vise you can remove the piece and put it right back where it was
[02:42:33] <pfred1> as in you'll be drilling the same hole if you are drilling a hole
[02:44:11] <pfred1> Thetawaves then when you're done cutting air the next most popular thing is to load a pencil as a tool and let it draw on a piece of paper
[02:44:25] <pfred1> pencils are cheap enough
[02:45:28] <joe9> pfred1: why not use parallels?
[02:45:44] <pfred1> joe9 I do
[02:45:51] <pfred1> they go under the work though
[02:46:09] <pfred1> they don't really align it side to side
[02:46:40] <joe9> oh, ok. vise stop is for side-to-side alignment.
[02:46:43] <joe9> got it.
[02:46:49] <Thetawaves> pfred1, so i've got my z axis setup -40 to 0
[02:47:14] <Thetawaves> emc logo claims to go outside the bounds of my z axis
[02:47:16] <pfred1> why not -2 to +2 ?
[02:47:26] <pfred1> yeah that'll happen
[02:47:46] <pfred1> that took me a bit to figure out
[02:47:51] <Thetawaves> so all my thing should be setup with +-
[02:47:59] <Thetawaves> s/thing/axis/
[02:48:05] <pfred1> well the Z axis for the logo
[02:48:36] <Thetawaves> ok
[02:49:00] <pfred1> in the comments it gives some hints to get it to run
[02:49:07] <pfred1> I forget what it is now
[02:50:25] <pfred1> joe9 lots of people make vise stops that screw right to their vises
[02:50:38] <pfred1> I didn't feel like drilling a hole in mine though
[02:50:48] <joe9> i am searching to see if I can buy it from HF or HomeDepot.
[02:50:54] <pfred1> not because it is a great vise but I just didn't feel like getting another vise out to hold it in
[02:51:27] <joe9> i am thinking of something that I can clamp onto the vise.
[02:51:43] <pfred1> yup people og that route too sort of like a custom C clamp
[02:51:48] <joe9> I do not think I can get a good hole in my vise.
[02:52:08] <pfred1> there is on on instructables
[02:52:20] <pfred1> http://www.instructables.com/id/Machinist-Vise-Stop-Clamps-on-jaw-/
[02:52:23] <pfred1> that idiot
[02:53:01] <pfred1> with his precision vise stop woo woo
[02:53:17] <pfred1> you cna jamb a rock into a tee slot and it'd work
[02:54:35] <Tom_itx> use a dowel pin in a tool holder
[02:54:40] <pfred1> but yeah work stops are really handy now that i have one I use it a lot
[02:54:52] <Tom_itx> use allthread off the end of the vise
[02:54:59] <Tom_itx> there are dozens of ways to make a stop
[02:55:08] <pfred1> and a million uses too
[02:55:27] <pfred1> it really ups the repeatibility game
[02:55:53] <Connor> http://www.cnczone.com/forums/1043298-post104.html
[02:56:01] <Connor> My End stop I made using 80/20.
[02:56:23] <pfred1> ah the third word for cnczone
[02:56:31] <pfred1> after mach3 and Gecko
[02:56:50] <Connor> Eh?
[02:57:10] <pfred1> you can basicilly sum that entire site up with those 3 words
[02:57:21] <Connor> I don't think so.
[02:57:27] <Connor> Lots of good info on that site.
[02:59:02] <pfred1> cnczone emc2 About 34,400 results cnczone mach3 About 204,000 results
[03:00:05] <pfred1> I'm surprised it is so even
[03:01:22] <pfred1> it doesn't seem like mach3 is much longer for this world anyways
[03:01:46] <pfred1> XP licenses are getting harder to come by :)
[03:03:19] <pfred1> hey i thought this site got taken offline? http://www.rapidsharedata.com/tag/cnc+zone+mach3+crack/
[03:04:27] <pfred1> check it out someone has posted the EMC2 crack! http://www.rapidsharedata.com/tag/EMC2+crack/
[03:04:47] <pfred1> mad hacking skillz
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[03:10:53] <joe9> any suggestions on where I can find a round clamp that I can attach to the quill of a drill press?
[03:11:04] <Tom_itx> make one?
[03:11:18] <joe9> I am planning to use that clamp to either attach the jaw of a calipers or a dial indicator
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[03:12:23] <joe9> Tom_itx: I am a noob. I doubt I can make one that is flawless.
[03:12:25] <pfred1> joe9 I made this to hold a little router http://i.imgur.com/7u0zS.jpg
[03:12:33] <pfred1> drilling that hole wasn't easy!
[03:13:12] <pfred1> I used an adjustable spade bit
[03:14:14] <pfred1> I made it so I could fit that tool into the column http://i.imgur.com/zWNB9.jpg
[03:14:27] <pfred1> almost like it was made for it huh?
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[03:15:24] <tehDarkAura> hardware?
[03:15:38] <pfred1> no, software
[03:16:04] <tehDarkAura> can someone point me to some prefered hardware setups
[03:16:07] <tehDarkAura> ;)
[03:16:22] <pfred1> for LinuxCNC?
[03:16:46] <tehDarkAura> yeah to drive the steppers etc
[03:17:28] <pfred1> the really hardcore here seem to lean towards servos
[03:17:58] <tehDarkAura> ahh wow
[03:18:10] <pfred1> well I run open ended steppers
[03:18:33] * pfred1 dreams of someday running servos but who knows ...
[03:19:15] <pfred1> my drivers just have step and direction inputs and it was easy to get it to work with LinuxCNC
[03:19:25] <pfred1> I mean even I could do it!
[03:20:12] <tehDarkAura> hehehe
[03:20:20] <pfred1> tehDarkAura http://www.youtube.com/watch?v=cgbeyNNBZ68
[03:21:22] <pfred1> you can get drivers similar to what I have for about $22 USD for 3 axis boards
[03:21:24] <tehDarkAura> very cool :)
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[03:22:11] <pfred1> but if you want higher performance you have to go for nicer more expensive hardware
[03:22:22] <tehDarkAura> ahhh I see
[03:22:33] <tehDarkAura> can I bug you for a link or name?
[03:22:38] <pfred1> that'd set you back about $150 or more
[03:23:07] <tehDarkAura> even that isnt too bad -- rather start small and move if i identify a need though
[03:23:27] <pfred1> well the more expensive drivers hold their value better
[03:23:38] <tehDarkAura> ahh okay
[03:23:53] <pfred1> the cheap ones are hardly worth their weight to ship around
[03:24:24] <tehDarkAura> oh i just realised the title of the vid is a driver ;)
[03:24:51] <pfred1> well the main driver IC
[03:24:55] * tehDarkAura brews more coffee
[03:25:03] <pfred1> that is a TB6560AHQ based motor driver
[03:25:20] <pfred1> they're about as cheap as it gets well you can go al itle cheaper
[03:25:24] <pfred1> but not much
[03:28:17] <pfred1> dang G540s are that expensive?
[03:39:19] <tehDarkAura> one on ebay with 4 motors for 650 :P
[03:39:35] <tehDarkAura> looks like nice motors though
[03:40:22] <pfred1> I bought surplus motors and they were $13 a piece 200 oz/in bipolar
[03:40:35] <tehDarkAura> ohh nice
[03:40:56] <pfred1> ah most would consider them underpowered for a homebrew CNC router
[03:41:00] <tehDarkAura> what V?
[03:41:04] <pfred1> so I figured I'd use 2 an axis
[03:41:13] <tehDarkAura> makes sense
[03:41:24] <tehDarkAura> nema23?
[03:41:27] <pfred1> cheaper than one big powerful motor
[03:41:36] <pfred1> yeah twin stack nema 23s
[03:41:44] <tehDarkAura> sweet
[03:42:29] <tehDarkAura> you use acme threaded rod or V cut?
[03:42:36] <pfred1> tehDarkAura watch this http://www.youtube.com/watch?v=fHPKaHLzXes
[03:42:42] <tehDarkAura> kk
[03:43:48] <tehDarkAura> ahhh
[03:44:02] <tehDarkAura> looks like it goes pretty fast
[03:44:06] <pfred1> I raised my microstep mode and got it to run faster never made a video though
[03:44:28] <pfred1> I think i made it to 1.5 or 1.7 IPS
[03:44:35] <tehDarkAura> nice!
[03:45:01] <pfred1> yeah not too shabby for 24VDC power in I guess
[03:45:13] <pfred1> remember you have to power this stuff
[03:45:19] <pfred1> more power usually costs more money
[03:45:24] <tehDarkAura> yeah im in no hurry -- if i can get my pcbs made here instead of shipping to china ill be happy :)
[03:45:48] <pfred1> high perf steppers run 48VDC and up
[03:45:55] <tehDarkAura> ahhh wow
[03:46:09] <pfred1> so I'm firmly entrenched in the middling performance category presently
[03:46:37] <pfred1> the way i look at it is I have lots of room for improvement
[03:46:50] <tehDarkAura> :) no doubt
[03:47:12] <tehDarkAura> better to get rolling and make your own pcbs for the drivers ;)
[03:47:42] <tehDarkAura> im intrigued what the servo stuff looks like
[03:47:50] * tehDarkAura goes to youtube to search
[03:47:54] <pfred1> these are the drivers I made http://www.instructables.com/id/TB6560-Microstepping-Bipolar-Chopper-Stepper-Motor/
[03:48:42] <pfred1> yeah for servos folks here seem to prefer mesa boards
[03:49:11] <pfred1> that is all peak performance stuff steppers usually can't keep pace with any of that
[03:49:31] <pfred1> but it seems pretty complicated to me to get it all working
[03:50:37] <Tom_itx> i used a mesa board for my steppers
[03:50:47] <pfred1> sure they work for that too
[03:51:02] <Tom_itx> don't have new driver boards yet, still using the original ones i had
[03:51:14] <pfred1> Tom_itx I'm trying to keep my entire build under $100 :)
[03:51:36] <pfred1> we all have to have goals you know?
[03:51:39] <tehDarkAura> right on!
[03:52:09] <tehDarkAura> boards look nice -- will definately be back to look at your schem again
[03:52:18] <pfred1> 100 IPM for under 4100
[03:52:23] <pfred1> 100 IPM for under $100
[03:52:36] <tehDarkAura> thats awsome
[03:52:49] <Tom_itx> what are you driving with them?
[03:52:56] <pfred1> router
[03:53:08] <Tom_itx> less load than a mill then?
[03:53:16] <pfred1> I picked up at a flea market for $15
[03:53:26] <pfred1> oh yes much less
[03:53:39] <pfred1> my mill cost $800 so that blows the budget right there
[03:54:06] <pfred1> I mean the whole machine under $100
[03:55:10] <pfred1> if I was to CNC my mill, and I'm not, I'd need to replace its lead screws
[03:55:52] <pfred1> they'd likely run me more than $100 an axis to do
[03:56:04] <pfred1> and render the machine useless ot me for manual use
[03:56:33] <pfred1> so that whole plan is scotched
[03:57:12] <pfred1> plus I've no work i am interested in doing CNC on a mill
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[04:01:00] <Tom_itx> i do
[04:01:07] <Tom_itx> but my mill is really small
[04:01:17] <pfred1> mine is no giant
[04:01:32] <Tom_itx> sherline
[04:01:37] <Tom_itx> i've had for years
[04:01:39] <pfred1> Ok yours would fit on mine
[04:01:44] <Tom_itx> :)
[04:01:57] <pfred1> but I've run a mill 4 of mine would fit on too
[04:01:58] <Tom_itx> i used to program/run the big ones
[04:02:03] <jdhnc> joe9: http://www.ebay.com/itm/180586633070
[04:02:29] <pfred1> that thing was awesome
[04:02:39] <pfred1> it's run a 3 inch hogger like nothing
[04:02:57] <pfred1> just go blasting right through M3 steel
[04:03:24] <Tom_itx> these were mostly tree, fadal and okuma
[04:03:28] <Tom_itx> vmc
[04:03:42] <Tom_itx> various sizes
[04:03:47] <pfred1> this thing said Milwaukee #3 on it
[04:04:11] <Tom_itx> we ran mostly aircraft stuff
[04:04:25] <pfred1> maybe you used tools i made then?
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[04:04:43] <pfred1> we made clamps for the aircraft industry
[04:04:55] <pfred1> I think Boeing
[04:04:59] <Tom_itx> we made most of our fixtures
[04:05:09] <pfred1> we just made the clamps
[04:05:18] <Tom_itx> we were certified for boeing but they never sent much our way
[04:05:19] <pfred1> they'd attach them to their own fixtures
[04:05:51] <AitalMAC> it's possible to connect stepgen of a fourth axis to the spindle controll?
[04:06:19] <Tom_itx> seems almost anything is possible with linuxcnc
[04:07:06] <pfred1> it is all ones and zeros
[04:07:31] <pfred1> the matrix!
[04:07:38] <AitalMAC> So if i get the Hal right i can connect it?
[04:07:55] <pfred1> connect it to what?
[04:08:16] <AitalMAC> Praticly i need acceleration and decelaration for my spindle
[04:08:25] <AitalMAC> but PWMgen does not provide that
[04:08:33] <pfred1> ah ha
[04:08:35] <AitalMAC> so i was sondering if i could use stepgen
[04:08:45] <AitalMAC> wonderings
[04:08:59] <AitalMAC> just wild guess
[04:09:01] <pfred1> so PWM just puts out one frequency?
[04:09:07] <AitalMAC> Yes
[04:09:20] <pfred1> not much modulaiton going on there
[04:09:28] <pfred1> modulation even
[04:09:47] <AitalMAC> Yes
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[04:09:56] <pfred1> that doesn't sound right to me
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[04:10:05] <AitalMAC> But i like to be able to use my spindle with the M3 command from Gcode
[04:10:11] <pfred1> the big deal with PWM is that it M's
[04:10:13] <AitalMAC> and not as an actual fourth axis
[04:11:14] <pfred1> EMC can't do spindle speed control?
[04:11:30] <Tom_itx> why not?
[04:11:40] <Tom_itx> just need feedback
[04:12:04] <pfred1> OK open loop spindle speed control then
[04:12:40] <pfred1> I find even that hard to believe
[04:14:10] <pfred1> AitalMAC http://linuxcnc.org/docs/2.5/html/examples/spindle.html#_spindle_soft_start
[04:14:11] <AitalMAC> I don't think i can get to 8000 RPM with feedback
[04:14:39] <pfred1> AitalMAC is that what you need?
[04:14:56] <AitalMAC> thank you
[04:15:03] <pfred1> sure np
[04:15:04] <AitalMAC> i'll look into it i'll let you know
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[04:18:20] <AitalMAC> I see how it works for acceleration, will it do the same for decellaration?
[04:18:42] <AitalMAC> if i send an M5 command, will it decellerate?
[04:20:39] <pfred1> it seems like if you want all the spindle control you do maybe a spindle encoder isn't asking too much?
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[04:29:32] <tehDarkAura> could make a spot for a mag and use a hall effect sensor
[04:29:59] <pfred1> tehDarkAura most do it with make break light plates
[04:30:26] <tehDarkAura> ahhh
[04:30:42] <pfred1> then with a couple sensors you can extraploate
[04:31:00] <pfred1> extrapolate even
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[04:31:04] <tehDarkAura> ;)
[04:31:20] <pfred1> getting late here been trying to get away for a while now
[04:31:22] <tehDarkAura> im no spelling nazi -- no spell check in my client
[04:31:32] <tehDarkAura> later
[04:31:45] <tehDarkAura> thanks for the links & info :)
[04:31:53] <pfred1> that is just my sausage fingers getting tied up over the keyboard
[04:33:45] <pfred1> tehDarkAura if you are building your own machine the best advise I can think to offer is take your time planning and that should save you from some of the more lethal pitfalls that catch folks in more of a hurry to get up and running
[04:35:12] <pfred1> well that and have some realistic targets you wish to achieve
[04:35:24] <pfred1> you know some concrete goals
[04:35:42] <pfred1> as far as speed size accuracy etc go
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[04:35:55] <tehDarkAura> okay cool -- appreciate the advise :)
[04:36:02] <tehDarkAura> *c
[04:36:14] <pfred1> once you've outlined all of that then your decisions get easier to make
[04:36:32] <pfred1> when you can come up with some numbers
[04:38:40] <tehDarkAura> totally makes sense -- I've been checking a lot of other people attempts / successes -- has helped
[04:39:27] <pfred1> successes are easy enough to find examples of failures can be more telling though
[04:40:47] <tehDarkAura> the blogs that end mid project ;)
[04:40:57] <pfred1> exactly
[04:41:05] <pfred1> yeah last update in 2008
[04:41:14] <tehDarkAura> lol have seen a few
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[04:47:04] <morfic> pcw_home: you wouldn't happen to have some little script that creates a test setup out of all used pins the hardware+firmware have available? if not i'll figure out how to copy/paste some sort of *vcp "test panel" together.
[04:48:45] <pfred1> tehDarkAura see if you can find a copy of this file http://www.scribd.com/doc/50421588/CNCMechanics-v1-2
[04:49:28] <tehDarkAura> aha! very cool thank you ! :)
[04:50:33] <pfred1> in their viewer that file looks kind of scrambled to me
[04:50:45] <pfred1> could be my browser I don't know
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[04:53:46] <tehDarkAura> not to bad in mine -- first page got cut short i think
[04:54:11] <pfred1> tehDarkAura the original filename is CNCMechanics v1.2.pdf
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[06:11:20] <AitalMAC_2> http://linuxcnc.org/docs/2.5/html/examples/spindle.html
[06:13:08] <AitalMAC_2> i need help with the spindle soft start
[06:17:29] <AitalMAC> I have connect spindle to PWMgen and the scale is working but it's on the side
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[06:17:35] <AitalMAC> i would like to connect them
[06:18:03] <AitalMAC> I'm using 2 PC sorry for the confusion
[06:18:13] <aitek> hello
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[06:19:07] <AitalMAC> Right now when i set a speed i see the scale doing his acceleration and decelleration job
[06:19:13] <AitalMAC> in the hal meter
[06:19:45] <AitalMAC> but my spindle is still jumping like hell because the pwm are still outputted like before
[06:19:55] <AitalMAC> Any help?
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[06:30:21] <AitalMAC> sorry i got it
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[07:41:18] <DJ9DJ> moin
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[11:05:24] <Rogue> hi
[11:25:47] <DJ9DJ> hi
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[11:55:54] <yoyo_> hi
[12:00:53] <DJ9DJ> hi
[12:01:53] <yoyo_> is there a gcode to touch a over a circuit of object ?
[12:02:40] <archivist> touch a over a circuit? do you mean probe
[12:03:00] <yoyo_> I have object flat object ~h2mm
[12:03:28] <yoyo_> and I would like to probe it over a circuit
[12:04:02] <yoyo_> something like 3d touch scanning but not 3d only 2d over circuit
[12:04:56] <archivist> to do what with the information?
[12:05:38] <yoyo_> have circuit probe coordinates
[12:05:42] <awallin_> http://www.youtube.com/watch?v=_Qr8tZXGXZU
[12:06:23] <archivist> not sure what you mean by circuit in this context
[12:07:03] <yoyo_> points on the circumference of the object
[12:10:28] <yoyo_> scan edges of object not sufrace
[12:11:26] <archivist> I know what you want now, just not aware of a simple method at the moment
[12:12:26] <yoyo_> I can write it by my self but first I wanted to ask
[12:12:34] <cncbasher> could gridprobe.ngc be of use , and turn off the z axis probing perhaps
[12:14:58] <archivist> I think it needs a different algorithm thing of an M or an O part to be scanned
[12:15:03] <archivist> think
[12:16:57] <archivist> or better still a maze
[12:17:01] <cncbasher> simple until you think how the hell do i do it
[12:17:20] <yoyo_> yyy no drama :P
[12:17:46] <yoyo_> if there is no ready gcode I will write it and share
[12:18:22] <archivist> use the standard 3d and slice maybe
[12:18:25] <cncbasher> i'm not aware of one
[12:18:35] <yoyo_> in the meantime new release of mgcodegenerator on wiki :)
[12:19:50] <cncbasher> i have always wanted to scan /probe items , i'll have to give it a go now
[12:30:42] <Loetmichel> *buuurrrrp*... my wife goes on a doc-controlled diet tomorrow... so she bought a "last meal" at McD... and supplied me with the same ;-)
[12:30:52] * Loetmichel is a bit short of bursting ;-)
[12:31:12] <Loetmichel> good monrning/ good day btw.
[12:39:44] <cncbasher> it will be your last meal too , did she not tell you ..
[12:46:10] <DJ9DJ> hi Loetmichel :)
[12:46:19] <DJ9DJ> hehe
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[12:49:16] <Loetmichel> cncbasher: she did ;-)
[12:49:33] <DJ9DJ> hmm, until easter?
[12:49:59] <DJ9DJ> lenten season? (says dict.leo.org *G*)
[12:50:10] <Loetmichel> i.e. she told me: "as i have to follow a strict eating code you will have to cook for yourseld the next half year" ;-)
[12:50:52] <DJ9DJ> haha
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[13:34:43] <awallin_> more cam experiments: http://www.youtube.com/watch?v=lfIU_gv0iB8
[13:37:33] <syyl> that is cool :)
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[13:52:37] <Tom_itx> cool but alot of air cuts
[13:53:00] <pfred1> cuts air like hot butter!
[13:53:17] <awallin_> yeah..
[13:54:02] <awallin_> now it only keeps track of what has been cut "behind" the advancing cut-arc
[13:54:06] <archivist> are the outer corners supposed to be the same?
[13:54:44] <awallin_> when we come to the end of a cycle in the MA there is cleared material "in front" of the advancing cut-arc, which the algorithm isn't aware of. thus a lot of air-cuts
[13:54:55] <pfred1> archivist define "the same?"
[13:55:07] <awallin_> yes the corners should be the same, but the resolution of the simulation isn't that great. or there's a bug - I don't know
[13:56:00] <pfred1> attributes are not bugs when they can be defined as features
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[14:33:35] <joe9> I want to make 8cm x 8cm piece with drilled holes. Is it wise to cut it to size and then drill it or cut it to 8.5cm x 8.5cm, drill and then cut to size?
[14:33:40] <joe9> which is the recommende way?
[14:36:27] <pfred1> usually you size the work then work on it but of i need a piece to fit with another piece I go oversized then trim to fit
[14:38:18] <pfred1> makes stuff come almost looking like I know what I'm doing sometimes when I do that
[14:38:55] <pfred1> the trim to fit technique
[14:39:12] <joe9> pfred1: thanks a lot. To cut the piece to size I am using the heavy duty paper trimmer. Is that a good idea?
[14:39:20] <joe9> or should I be filing it to get it to size?
[14:39:28] <pfred1> sheet metal?
[14:39:30] <joe9> it is 1/32" inch thick
[14:39:33] <joe9> no, pcb
[14:39:53] <pfred1> I came up with a way to cut PCB with a knife and a straight edge I prefer
[14:40:11] <pfred1> what you do is score the board over and over and angle the blade different digging a channel
[14:40:20] <pfred1> then it just snaps
[14:40:34] <pfred1> comes out really straight and you can sand the edge a little but it is clean
[14:41:04] <pfred1> if you're doing it right little wisps and curls of the board should come up out of the channel you're making
[14:41:38] <pfred1> 10 or so passes is about all it takes
[14:42:02] <joe9> ok, thanks.
[14:42:26] <pfred1> I used to use all kinds of cockamamy ways to cut PCB I like the knife and straight edge way better than them now
[14:42:49] <joe9> why? precision?
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[14:43:05] <pfred1> yeah it doesn't beat on tools and I get precise clean cuts
[14:43:14] <pfred1> PCB that fiberglass really tears up blades
[14:43:29] <pfred1> but a knife blade I don't care i can resharpen it easily enough
[14:43:35] <joe9> oh, ok.
[14:44:03] <pfred1> I've used circular saws bandsaws hacksaws
[14:44:12] <pfred1> but knife and straight edge way for me to go now
[14:44:31] <pfred1> cut on the copper side
[14:44:46] <pfred1> unless it is double soded then you're going to have to transfer your score t othe other side
[14:45:13] <pfred1> which with a knife isn't hard to do
[14:46:03] <pfred1> but every time you rip the knife down the straight edge angle it a little different side to side perpendicular to the straight edge kind of
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[14:46:16] <pfred1> so you dig a channel
[14:46:52] <pfred1> like I said if you're doing it right slivers of the board should emerge from your channel as you go along
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[14:47:27] <joe9> ok, thanks a lot.
[14:47:31] <pfred1> I use a utility knife
[14:48:08] <pfred1> steel straight edge of course
[14:48:46] <pfred1> sanding the edge of the board does clean them up
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[14:49:30] <pfred1> yesterday I polished the edge of a piece of clear plastic that I cut on a circular saw
[14:49:35] <pfred1> man it came out amazing
[14:49:57] <pfred1> thing is like optical quality
[14:50:46] <Tom_itx> i got a little kit from the local plastic company for stuff like that
[14:51:03] <pfred1> I used turtle wax polishing compound for my final
[14:51:03] <Tom_itx> starts with uber fine sandpaper then goes to paste then wax
[14:51:22] <pfred1> yeah I started out 100 grit 150 220 320 400 600
[14:51:32] <pfred1> then hit it with the polishing compound
[14:51:35] <Tom_itx> this is like 3600 grit or more
[14:51:45] <pfred1> nope it came up after wet sand with 600
[14:51:50] <pfred1> came right up
[14:52:52] <pfred1> now i have some other hunks of plastic i want to do it to
[14:53:23] <pfred1> it is freaky to be able to see through the edge
[14:53:49] <pfred1> I mean I can see clear through it
[14:54:22] <pfred1> stuff I did is about a quarter of an inch thick I'd say
[14:55:18] <pfred1> but i have a bolt in the middle of it I can see the bolt through the side
[14:56:45] <pfred1> it looks like someone flamed the other "good" side I can see the ripples all the way through the piece
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[15:04:02] <mikegg> is it possible to use more than one fpga with hostmot2? I.e. a 5i20 and 7i43
[15:04:41] <pfred1> you know what they say anything is possible the real questions are is is practical or is it likely
[15:05:30] <mikegg> I'll give it a shot I guess
[15:06:21] <pfred1> you ran out of IO with one?
[15:06:39] <mikegg> well not really - kinda
[15:06:55] <pfred1> or you just want to split a time task?
[15:07:36] <pfred1> like spread a workload
[15:07:49] * jthornton sees bubbles
[15:08:10] <mikegg> right now I have two servos on a 7i39, a stepper on the z-axis and +/-10 spindle on a 7i33
[15:08:15] <pfred1> jthornton some say our entire Universe is a bubble
[15:08:44] <mikegg> i'd like to replace the stepper with a servo
[15:09:12] <pfred1> I thought mesa made multi servo boards at least that was the impression I had
[15:09:37] <pfred1> they seem to offer complete kits
[15:10:00] <mikegg> yeah, they do. two servos per board. So if you have a 3-axis machine 2/3 of the 50 pin connectors get used up for servos
[15:10:05] <mikegg> on a 5i20
[15:10:08] <pfred1> ah ha
[15:10:21] <pfred1> that is the best you can do is 2 servos on a board?
[15:10:41] <pfred1> so anyone with more than that many axis is running multiple boards?
[15:10:58] <pcw_home> AFAIK you can have any mix of cards and multiples of each
[15:11:33] <pfred1> pcw_home that strikes me as the most realistic either that or their hardware is artificially limited
[15:11:54] <pfred1> something I'm sure their engineers strive to not do
[15:11:57] <mikegg> I thought that was the case
[15:12:04] <mikegg> heh
[15:12:34] <pcw_home> we will have a SSERIAL equivalent of the 7I39 sometime this year (with fewer FPGA pins used)
[15:12:34] <pfred1> well we'd love to sell you more of our product but unfortunetately it all doesn't work together ...
[15:12:36] <morfic-> pcw_home: if pin 49 cable power makes it to the 7i44, should i expect the 7i70 to have any status LEDs lid even w/o firmware loaded?
[15:12:51] <mikegg> ah hah, I was just going to ask about that
[15:13:23] <pcw_home> morfic: yes the red fault LED should be lit
[15:13:30] <mikegg> pcw_home: the 7i40 as well?
[15:13:38] <pcw_home> Yes
[15:15:01] <mikegg> sweet
[15:15:37] <pcw_home> morfic: forgot to say only if you have field power (12-24v)
[15:16:25] <pcw_home> without field power you got nothing :-)
[15:16:25] <morfic-> thanks, in the 5i22 manual i see cable power is 5V, pull up voltage is 3.3V and so is the bus switch mode, this installed 5i22 has all three jumpers for all 4 connectors in the up/5V position
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[15:17:14] <morfic-> pcw_home: "w/o field power it'll never show anything in dmesg either" kind of nothing?
[15:17:22] <ctjctj> I am having a problem where gladevcp never comes ready. What is the standard method of debugging this issue?
[15:17:45] <pcw_home> the 5V from the 5I22/7I44 runs the 422 interface on both the 7I44 and the 7I70, but the 7I70 needs field power for its logic and processor
[15:18:11] <pcw_home> so it wont even bee seen without field power
[15:18:21] <pcw_home> (it being the 7I70)
[15:19:55] <joe9> # Pad[-1.6250mm 1.025mm
[15:19:55] <joe9> # 1.6250mm 1.025mm
[15:19:55] <joe9> # 3.900mm 30.000 mil 3.950mm "12" "12" "square"]
[15:20:04] <joe9> sorry, wrong paste.
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[15:20:45] <pfred1> now i have to hear Iron Man
[15:20:55] <joe9> Has anyone tried a "Harry Watts Square Drill Bit"? I am trying to buy one. Cannot seem to find a place selling it in the US.
[15:21:16] <joe9> http://technabob.com/blog/2011/11/15/drill-bit-makes-square-holes/
[15:21:21] <pfred1> pcw_home born in the great magnetic field!
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[15:22:45] <mikegg> has he lost his mind?
[15:23:10] <pfred1> ah he was turned to steel in the great magnetic field
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[15:24:01] <pfred1> I guess being a legendary rock god isn't as easy as it looks
[15:24:53] <Tom_itx> joe9, use a broach
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[15:25:16] <pfred1> Tom_itx I ran a huge one of those once
[15:25:34] <pfred1> they had to tear the roof off the building and place it in with a crane
[15:25:49] <pfred1> it wouldn't fit through any doors
[15:26:07] <Tom_itx> they didn't think that out very well
[15:26:15] <pfred1> how do you figure?
[15:26:21] <joe9> Tom_itx: I just have a drill press.
[15:26:42] <Tom_itx> pfred1, if they had to take down the building to get it in
[15:26:43] <pfred1> this thing had 6 foot long plates
[15:26:57] <pfred1> well the building was already there before they got the machine
[15:27:46] <pfred1> it'd rip a dovetail into a chunk of steel an inch deep without even batting an eyelash in one shot
[15:28:04] <pfred1> just come down da da da da blade after blade
[15:28:13] <joe9> and I do not want a through hole. more like a slot.
[15:29:07] <pfred1> Tom_itx the dopes that owned it when they trained me to operate it they taught me to feel for metal chips in the cam vise before loading a piece
[15:29:23] <pfred1> because if there was a chip in there it was bad news
[15:29:53] <pfred1> meanwhile this machine had one inch oil pipe spraying oil all over the place filling the vise fixture etc
[15:30:13] <pfred1> so missing a chip now and again while it was cycling I mean it happened
[15:30:25] <pfred1> I missed a couple
[15:30:39] <pfred1> piece would go shooting clear across the shop!
[15:30:46] <pfred1> boss would come up shaking his head
[15:31:08] <pfred1> after the second time i started waving a megnet in the fixture before I loaded in a piece
[15:31:18] <pfred1> magnet never missed a metal chip
[15:31:28] <pfred1> 40 years they never thought of it
[15:31:36] <Tom_itx> provided it was ferous metal
[15:31:42] <pfred1> all we did was steel
[15:32:14] <pfred1> was no other kind of stock in the whole place
[15:32:20] <morfic-> pcw_home: thanks, i keep asking for power supplies, even if in the end it would work w/o, it's nice to have one for testing
[15:32:35] <pfred1> all the broach ever did was vise noses
[15:32:47] <pfred1> well noses bodies and the base serrations
[15:33:25] <pfred1> oh yeah that is right the noses were serrated too
[15:33:33] <pfred1> these things http://www.jstool.com/images/clamp.jpg
[15:33:51] <pfred1> that dovetail is broached
[15:34:15] <pfred1> and on the bigger clamps it is pretty deep
[15:34:57] <pfred1> I should have stolen 100 of those clamps when I was working there
[15:35:11] <pcw_home> morfic: well the final machine needs control power (probably 24VDC)
[15:35:13] <pcw_home> you can make due with a 12VDC wall wart, or an old 19V laptop charger
[15:35:50] <morfic-> pcw_home: the 5i22 W7, W8, W9 jumpers are all up, instead of up/down/down as manual says, is this a new shipping configuration?
[15:35:51] <pfred1> morfic- power supplies are easy to make
[15:36:15] <pfred1> for 5V get a 7805
[15:36:24] <pfred1> they cost about a quarter
[15:36:43] <pcw_home> Yes I think we changed to the safest working config
[15:37:31] <morfic-> pcw_home: yes i have a 19V cut up laptop psu at home i used to use to power my furnace control board, just blamed lack of knowledge to load firmware more than power, so don't have anything close by, i'll have him wire it up Monday then
[15:37:31] <pcw_home> the 7I70/7I71 aren't picky they will work with 10-32VDC
[15:38:03] <pfred1> pcw_home they have an on board regulator?
[15:38:06] <morfic-> i mean, i could cut up a walwart, but my luck means it would turn out to be job altering for me to do so o_O
[15:38:25] <pcw_home> Heck 2 9v batteries would run it for a while
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[15:39:08] <pfred1> I hate batteries with electronics
[15:39:15] <morfic-> pcw_home: and there i was thinking only i have such "unprofessional ideas" :P
[15:39:23] <pfred1> everything works good when they're fresh but that never lasts
[15:39:51] <pfred1> what is great about batteries is they're the cleanest power known to man though
[15:39:58] <pcw_home> servomotor and a diode (helper turns motor)
[15:40:06] <pfred1> a battery is real DC
[15:40:50] <pcw_home> what scared me is high voltage/high power batteries, no way to turn them off
[15:40:58] <morfic-> pcw_home: now you make me tell everyone how my brother in law's father used to have to pull the transmission belts if the steam engines in basement went out, so the journeyman could run their lathes...."before the big war"
[15:41:01] <pfred1> once i had about 150 9V batteries and we connected them all up in series
[15:41:27] <pcw_home> Yow!
[15:41:27] <pfred1> you can hook 9V batteries up almost like they're legos
[15:41:48] <pfred1> well when you have that many of them they really don't make the best contacts we found
[15:42:03] <pfred1> maybe it wasn't that many but i had a box load of the suckers
[15:42:13] <morfic-> i never had enough 9V blocks to be a pfred1, but u tried the concept...
[15:42:19] <pfred1> I think the best we managed out of it was like 150 volts?
[15:42:39] <pfred1> because them connectors would wiggle loose from each other they made pretty crap contact
[15:42:53] <morfic-> 15? for 135, 17 for 153?
[15:43:01] <pfred1> they were the cheapy ones not the folded under but kind of the open
[15:43:08] <pcw_home> I m old enough to remember 90V batteries (I used for neon light blinkers)
[15:43:42] <pfred1> still we must have been nuts to have done it
[15:44:01] <pfred1> thinking back I don't think I'd do it today
[15:44:02] <morfic-> pcw_home: i am so ready to finally see everything in dmesg though, you have no idea how much the "they are supported in the development version" "ok" changed to "why did we buy incompatible boards"
[15:44:46] <pfred1> morfic- tail -f /var/log/syslog is helpful too while debugging
[15:45:06] <pfred1> it kind of keeps going automatically
[15:45:28] <pcw_home> Well 2.5 should be released soon (and would have been I suspect absent the name change nonsense)
[15:45:37] <pfred1> you're going to have to be root to do that though
[15:45:55] <pfred1> users don't have access to syslog
[15:46:59] <pcw_home> morfic are you running 2.5 from the buildbot?
[15:47:15] <pfred1> pcw_home someone couldn't run sed on the package to change EMC2 to LinuxCNC?
[15:48:23] <pcw_home> well I think thats kinda what happened but ther are so many little corners for stuff to hide
[15:48:34] <pfred1> sed doesn't care
[15:48:42] <pfred1> it'll find every occurance
[15:49:09] <pfred1> sed s/EMC2/LinuxCNC/g;
[15:50:52] <pfred1> once i had to change forward slashes with sed then you just use different delimiters
[15:51:34] <pfred1> sed s#http://old#http://new#g;
[15:51:57] <pcw_home> I know a number of things were broken for a while
[15:53:14] <pfred1> grep -ir emc2 *
[15:53:39] <pfred1> that just shows them to you though
[15:54:34] <pfred1> grep -ir emc2 * | wc -l
[15:54:43] <pfred1> tells you how many there are
[15:58:00] <pfred1> UNIXalike OSes were built from the ground up to deal with source trees
[15:58:19] <pfred1> that is their reason to be
[15:58:55] <pfred1> all because one of my neighbors wanted to play SpaceWar in a basement up the street
[16:00:27] <pcw_home> I do know this, as do the developers, but I also know it was not that simple...
[16:00:59] <pfred1> what wasn't that simple?
[16:02:39] <pfred1> "UNIX is basically a simple operating system, but you have to be a genius to
[16:02:41] <pfred1> understand the simplicity
[16:02:54] <pfred1> that is what my neighbor said about it
[16:03:17] * pfred1 grew up in Summit NJ where Dennis Ritchie did
[16:04:25] <pfred1> he moved to Berkley Heights but I always still saw him shopping in the New Providence A&P
[16:05:54] <morfic-> pcw_home: hm2-pyvcp, noone ever made anything like it, or did they? would be nice to wire it up and have a set of buttons and leds and toggle stuff before the actual machine setup is ever written
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[16:07:00] <joe9> pfred1: did you know him personally?
[16:07:21] <joe9> Dennis Ritchie, I mean.
[16:08:57] <morfic-> pcw_home: oh, didn't notice the question, not from buildbot, built from git on the actual machine
[16:09:03] <pcw_home> morfic I dont think so but you can always use the show hal configuration for inputs and a halcmd script for outputs
[16:09:39] <morfic-> that's what i did earlier, show hal configuration that is
[16:09:49] <pcw_home> you c
[16:10:11] <morfic-> i think having a UI helps the other guy a lot, he looks lost when i work on terminal
[16:10:13] <pcw_home> an set output with setp
[16:11:11] <pcw_home> setting outputs is easier with halcmd because you can write little scripts
[16:12:39] <pcw_home> also getting a pin/parameter list with show pin, show parameter redirected to a file is helpful when editing a HAL file (so you can copy/paste the names)
[16:13:08] <morfic-> i need to take my time with this, i am trying to shoehorn the SVSS8_16 into an existing ini, i may try to see how far pure halcmd gets me, you refered to the 7i33 manual with out PWM vs PWMgen question, so i'll be headed that way since in the hm2-servo/5i22-small.ini i worked the firmware in, but everything is PWMgen in show hal cmds
[16:13:33] <morfic-> with our*
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[16:14:44] <pcw_home> the HM2-servo config should be fine to start with its all correct for what you have, you just need to add the I/O and change the config string
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[16:15:19] <pcw_home> are you using Run-In-Place?
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[16:15:49] <morfic-> pcw_home: i think once i have actual power and can work around dmesg i'll start to feel more comfy, not seeing the cards immediately makes it easy for the "ok, what of what i don't know is preventing me from showing the pins"
[16:15:55] <morfic-> pcw_home: yes, rip
[16:17:09] <morfic-> i think i have all the docs i need open in either a terminal or browser or acrobat, just needs some paging around to follow steps and verify functionality
[16:17:43] <morfic-> pcw_home: is there a run in place pitfall that makes you ask that? :)
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[16:20:33] <morfic-> knowing you agree editing HM2-Servo into a test config alone is great
[16:20:45] <morfic-> btw, did we sufficiently thank you for the quick formware turn around?
[16:21:19] <pcw_home> just make sure that if you do a man command its in a window where you have run the RIP script
[16:22:21] <pcw_home> (so the man matches the RIP version)
[16:24:06] <mazafaka> Do you know of such video cameras which are of a small size and can be fixed to helmet or whatever?
[16:24:20] <pcw_home> firmware that just has common sets of things on different connectors is really easy to make with copy/paste from old to new pinout file
[16:24:45] <pcw_home> GIYF?
[16:26:05] <morfic-> pcw_home: yeah, i may make it so rip-environment gets run for me every time i open a terminal
[16:26:58] <pcw_home> google helmet mount camera (there are some in sunglasses!)
[16:27:40] <morfic-> go to target, they have a ton right between videos and ipads, facing the main aisle "go pro" titled
[16:28:11] <mazafaka> OK
[16:30:21] <morfic-> pcw_home: well, based on how you said is supported in 2.5 vs "will be" or "shouldn't be hard to get working" i saw the 7i70/7i71 as the best solution, i just should have thought to ask you for firmware sooner and things would have been calmer when boss heard about "the untested hardware" i bought
[16:32:08] <morfic-> learned a lot today, one of them will allow me to recognize why linuxcnc doesn't load, if halrun is still open in another screen.....
[16:35:02] <pcw_home> morfic so on the 7I70/7I71 there's LED a red fault LED and a green activity LED
[16:35:04] <pcw_home> when you apply power the red fault LED should be lit, when LinuxCNC establishes communication
[16:35:06] <pcw_home> the green activity LED shoud blink at about 1/1000 the servo thread rate (1Hz at 1 KHz)
[16:35:38] <morfic-> any thoughts on what's easier to do mess with between pyvcp and gladevcp to do quick and dirty test panels, considering my python knowledge is near zero?
[16:35:53] <pcw_home> (and the red fault LED shoud extinguish)
[16:36:24] <morfic-> do the ports on 7I44 light up? or are they just there cause that's just std for how most are sold?
[16:37:05] <pcw_home> I dont know python either so I am not in a position to give advice
[16:37:07] <pcw_home> (the 7I44 LEDS are unconnected)
[16:38:42] <pcw_home> The most common RJ-45 blocks have the LEDs so we use them (the no LED option is custom)
[16:38:43] <morfic-> CR35/CR36?
[16:39:01] <morfic-> for fault and activity?
[16:39:29] <pcw_home> Not sure which is which
[16:39:59] <morfic-> i just mean area, looks like cr8 on side is also led
[16:40:36] <pcw_home> but if you just apply field power you should get the red fault LED
[16:41:27] <morfic-> doesn't matter much, i miss power, after that things should go towards self explanatory again i think
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[16:43:18] <pcw_home> without field power there's no communication so no hal pins...
[16:45:49] <morfic-> "field power" is how you call the power source used on the signal side
[16:47:10] <morfic-> too bad he read power on pin49 and stopped there, when i asked him, if we needed power, he only refered to that, seeing the 7I33 light up i guess helped us to run with that misconception
[16:50:08] <morfic-> i'll just refer him to page2 and tell him "that's your 24V" and have him find me field power around my desk
[16:50:42] <morfic-> double touchscreen setup is still on my desk next to my normal monitor and not anywhere close to the lathe :)
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[16:54:59] <morfic-> do not buy optical touchscreens for a machine, just saying
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[16:59:11] <pcw_home> Yes "Field power" is the isolated power for the "Field I/O"
[16:59:13] <pcw_home> it is the common power for the 7I71s outputs, the threshold reference for the 7I70s inputs
[16:59:15] <pcw_home> and is also used for the isolated side logic and processor
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[17:04:07] <morfic-> thanks for the clarification
[17:06:37] <morfic-> looking at page 7 of 7i70 manual it has a pin out again refering to field power and range of 8-32 V with PIN 5 for logic power also having 8-32V, at that point he should have questioned the 5V over pin 49 idea i think
[17:08:27] <morfic-> and repeating the range on page 8 :/
[17:08:33] <morfic-> RTFM goes a long way
[17:09:23] <mazafaka> new type of websites: http://www.paulrhayes.com/experiments/cube-3d/touch.html
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[17:20:36] <pcw_home> Normally pin 5 is connected to field power as well so you dont need to worry about the difference
[17:28:59] <DJ9DJ> mazafaka, i suggest to use a hypercube, because 6 sides might be to few pages ;)
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[17:32:12] <tom3p> halgui progress using nodebox http://edmsolutionsservice.com/pix/halgui-editor-24feb2012.ogv
[17:32:35] <tom3p> ^shift right click brinks up editor for that comp, and that pin
[17:32:44] <tom3p> brings
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[17:42:45] <morfic-> pcw_home: and guess who now has a 9V battery
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[17:44:10] <pcw_home> Ha! (though you need 2 to have I/O come up))
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[18:01:31] <tom3p> format of dictionaries for halgui (the palette you can select from, or the template that .hal indexes ) http://edmsolutionsservice.com/pix/haldict03.py
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[18:03:56] <mrsun> pcw_home, works nicley =)
[18:04:10] <mrsun> tho with the voltage drop over the thingie i get a maximum of 4.2V out
[18:04:15] <mrsun> at 99% duty
[18:04:26] <mrsun> (using 5V test voltage source)
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[18:07:10] <morfic-> pcw_home: lol
[18:08:39] <morfic-> pcw_home: so close
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[18:12:32] <mrsun> tho, dont know the pwm frequeny we used but had about 0.1V ripple
[18:12:48] <mrsun> dont know how sensetive these vfds are to ripple in the frequency ref voltage
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[18:25:39] <morfic-> pcw_home: 9V not being high enough or did i get the VFIELD == VIN with jumper W1 in "left position" wrong?
[18:26:17] <morfic-> 09:38 < pcw_home> Heck 2 9v batteries would run it for a while <--- because you said 2
[18:27:46] <morfic-> pcw_home: you want 2 in series to get us to the middle of the range?
[18:50:10] <morfic-> alright, got 18V
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[18:59:37] <morfic-> never get past red led on, at least i have power to test with monday
[19:01:15] <pcw_home> Yeah the VIN jumper should be in in the left position
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[19:06:49] <morfic-> it is, i have 18V between bottom pin VFIELD and top pin GND, green CR8 led on side is on and red fault CR36 is on, firmware loads, should the pins show up as available but unused?
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[19:09:55] <morfic-> pcw_home: CONFIG="firmware=hm2/5i22/svss8_16.bit num_encoders=-1 num_pwmgens=-1 num_leds=-1 num_stepgens=0 sserial_port_0=00000000"
[19:14:31] <pcw_home> That should work ( you should get the red out. green blinking)
[19:14:33] <pcw_home> where is the 7I44 connected?
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[19:16:23] <morfic-> pcw_home: i need to check layout, to see which P is closest to shield, left if pci connector is down and shield is left
[19:17:12] <pcw_home> 7I44 should connect to P4
[19:17:46] <morfic-> p2 and p3 show in dmesg as encoders
[19:18:25] <morfic-> is that the lvds one, just recall coming across one that was different from the others earlier today
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[19:19:56] <morfic-> P3 was the lvds one
[19:20:06] <pcw_home> dont mess with the LVDS option
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[19:20:54] <pcw_home> in any case P4 is the first (port 0) SSERIAL interface
[19:21:03] <morfic-> .pin tells me which is where
[19:21:45] <morfic-> sorry i was mostly babbling while finding this info in writing (even if it seems silly over irc, i consider your info verbal)
[19:22:21] <pcw_home> dmesg also gives you the pinout info
[19:23:13] <morfic-> what i looked at is not what it did, but what it expected........
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[19:25:40] <mrsun> hmm, i want to go test my spindle card with the actual vfd, i wonder how much i can destroy it if it all goes wrong ;P
[19:27:25] <pcw_home> if you only supply power from its 10.5V to its analaog speed input I doubt you can do much harm...
[19:27:27] <pcw_home> (famous last words)
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[19:35:42] <morfic-> sorry, forgot i wasnt on a screen at home
[19:36:07] <morfic-> green blinking led though as reward for the quick shutdown
[19:36:29] <morfic-> and pins to see in show hal configuration
[19:38:03] <morfic-> woot, and a 9V block is enough to get even that far
[19:38:27] <morfic-> couldn't resist to try it, now where i know what to expect in the config tree under pins
[19:39:35] <morfic-> thank you VERY much pcw_home
[19:43:29] <morfic-> http://www.linuxcnc.org/docs/html/drivers_hostmot2.html everything under 1.7 now makes utter sense, flying over several sections, the connector# didn't sink in
[19:53:01] <pcw_home> Glad you got it going. halcmd show pins is a good way to see what you've got
[19:54:31] <morfic-> sorry this was such a difficult birth
[19:55:17] <pcw_home> currently you have to be careful not to swap serial cables around as your I/O signals will move
[19:55:19] <pcw_home> this can be fixed later by checking that the card serial numbers match what you expect (locking down the config)
[19:56:56] <morfic-> that's kind of how my dual touchscreens still work
[19:57:52] <morfic-> <commandline>:0: Unknown 'show' type 'pins'
[19:58:06] <pcw_home> I suppose the driver could enumerate the cards in serial # order per type but thats a way off (and Andy is unavailable for the next 7 weeks or so)
[19:59:27] <pcw_home> I probably have the halcmd token names wrong
[19:59:36] <pcw_home> man halcmd...
[20:00:17] <morfic-> halrun seems like a good choice for me, otherwise i don't get realtime going, just using halcmd from commandline
[20:00:35] <pcw_home> Ah its "show pin"
[20:01:42] <morfic-> yeah found that, and i am better off to loadrt hostmot2 and hm2_pci with my config, just caught on to you giving me tip after the "well obviously" part was done :)
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[20:14:16] <morfic-> pcw_home: the bit i'm missing is what i would need to load to get halcmd to work from terminal, /etc/init.d/realtime start is not doing it, so i use halrun to do have it start RT for me
[20:14:46] <morfic-> so i could just write something up to run instead of typing/pasting in halrun
[20:17:21] <pcw_home> I just start LinuxCNC and the run halcmd from a terminal...
[20:17:30] <pcw_home> then run
[20:18:00] <morfic-> so i am not less elegant than you :)
[20:22:05] <pcw_home> well for halrun you need to kind of make a hal file anyway to get the right thread/comps going so why not just use what you have
[20:30:58] <mrsun> pcw_home, hmm, hooked up the vfd and i get a maximum of +6V at the output pin :/
[20:31:11] <mrsun> without load i get the full 10.5V
[20:31:17] <mrsun> with the analog input i get +6V
[20:32:21] <mrsun> and a buttload of frequency jitter
[20:32:27] <pcw_home> Well that means you have too much series impedance (your 10K)
[20:32:43] <mrsun> pcw_home, hmm ok
[20:33:06] <mrsun> pcw_home, any value you think would fit ? :)
[20:33:15] <pcw_home> best thing might be to add a rail-rail op amp
[20:33:27] <pcw_home> as a 1X buffer
[20:33:38] <mrsun> pcw_home, but that would require me to have an external power supply :(
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[20:48:49] <pcw_home> TLV2371 for example is a 16V rail-rail I/O CMOS op amp
[20:48:51] <pcw_home> so currently you have a 10 ms time constant you can do a
[20:48:53] <pcw_home> fair passive cascaded 2 pole filter by making the first stage lower
[20:48:55] <pcw_home> impedance than the second so PWM --> 10K 1 uF to GND --> 100K --> 0.1 uF to GND --> op amp folllower
[20:52:36] <pcw_home> The 100K is not a problem anymore as the CMOS OP amp is almost 0 load
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[21:04:37] <mrsun> pcw_home, inverted the signal and now it stops fine and starts fine
[21:04:57] <mrsun> then i found a parameter that i can set what speed it should be at at 10V .. so if i set that value to like 150 i got full speed at about 5V :P
[21:05:17] <mrsun> pcw_home, btw should i set this setup ive done as "potentiometer option" or as analog input option ? :)
[21:07:36] <mrsun> pcw_home, any schematic of what you are talking about so i can understand it a bit better? :)
[21:08:07] <pcw_home> netlist?
[21:08:42] <mrsun> pcw_home, humm, for something like ltspice? =) or what do you mean ?
[21:09:23] <pcw_home> Well since I cant just type in schematics but can type netlists...
[21:09:42] <mrsun> pcw_home, sure go for it and ill see what i can do with it =)
[21:16:19] <pcw_home> GND = C1.2,C2.2, R1.2,OPAMP.4
[21:16:21] <pcw_home> 10.5V = OPTOCol, OPAMP.7
[21:16:23] <pcw_home> PWM = R1.1, R2.1
[21:16:24] <pcw_home> FILT1 = R2.2,C1.1,R3.1
[21:16:26] <pcw_home> FILT2 = R3.2,C2.1, OPAMP.3
[21:16:28] <pcw_home> OUT - OPAMP.6, OPAMP.2
[21:17:02] <pcw_home> OOPS PWM needs OPTO-EM added
[21:17:39] <pcw_home> opamp pin #s are for single 8 pin OPAMP
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[21:23:34] <mrsun> hmm, thought ltspice would be able to open something like that but no :(
[21:26:11] <morfic-> as far as latencies are concnerned, looks like you are more relaxed on what us for jitter you said 50-100 us? often i see 20us as top, that aside, does the amount of servos being updated ultimately tie into the max jitter "target" or limit? or is the same jitter as bad fro a single servo as it is for 4? i susppose if we talk RT then it's the same?
[21:27:05] <morfic-> long story short, i am at ~22us right now, and any PM/second core/auto stuff i shut off doesn't really get me any better
[21:27:40] <morfic-> does seem if i run latency test in pncconf i get a better us jitter than when i call latency test from gnome menu
[21:27:58] <skunkKandT> for a servo machine? That will work great
[21:29:25] <skunkKandT> (non step/dir servos)
[21:30:05] <skunkKandT> (software step gen) - it will work well for that also - but my limit your top feed rate)
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[21:31:09] <morfic-> analog voltage ref for speed control servos
[21:31:28] <pcw_home> even 50 usec is only 50 u inches at 60 IPM cutting speed
[21:32:26] <morfic-> 60IPM as base for an easy rule of thumb number?
[21:32:48] <pcw_home> I think Seb was looking at factoring this error out as well (since at thread actuation we know the exact time)
[21:33:38] <morfic-> that ought to be a topic people must love to see gone then
[21:33:46] <pcw_home> well 1 IPS
[21:35:54] <pcw_home> I dont think it helps the software step rate limitations but for servo/hardware step systems even say 1/2 ms of jitter is theoretically tolerable if factored out
[21:35:55] <mrsun> pcw_home, so how i understand it its the low pass filter i got + another low pass filter, that is fed into the opamp ?
[21:37:18] <pcw_home> yes but the first must be lower impedance than the second (that's why I used your original 10K and 1 uF followed by 100K and 0.1 uF)
[21:37:50] <mrsun> http://i42.tinypic.com/118itex.png like that?
[21:38:25] <mrsun> im a real noob when it comes to stuff like this, digital stuff ic an handle but this analog stuff ... yuck =)
[21:38:27] <pcw_home> Yes but with a RRIO op amp
[21:39:39] <mrsun> TLC272CP is rail to rail
[21:40:01] <pcw_home> I dont think its RR in
[21:40:21] <mrsun> what do you mean ? :)
[21:41:07] <pcw_home> input common mode range does not extend to the rails (it does have RR outputs)
[21:41:34] <mrsun> hmm
[21:41:40] <pcw_home> they type you want is RRIO meaning rail to rail inputs and rail to rail outputs
[21:41:45] <mrsun> was one i could find where i usaly buy my electronics =)
[21:41:55] <mrsun> pcw_home, aha =)
[21:42:58] <morfic-> pcw_home: if it wasn't for coming in one day and "dude, you're getting a dell" i might not have to worry about jitter anyway
[21:44:10] <pcw_home> As skunkKandT said, 20 uSec is fine for servos
[21:45:24] <pcw_home> mrsun TLC272 inputs can only go to about 1v less than the positive supply before funny things happen (the do go to ground or V-)
[21:45:50] <mrsun> pcw_home, i hate op amps =)
[21:46:55] <pcw_home> well they will take your 10K output impedance filter and make it ~0 ohms
[21:48:41] <morfic-> pcw_home: right, i meant it in a "i wouldn't have had to worry about it" kind of way
[21:48:52] <mrsun> pcw_home, yeah but to find one that suites me in this very limited list ...
[21:49:15] <mrsun> http://www.electrokit.com/opforstarkare.c455 that is the list that i choose from as ordering from other places costs alot more etc :P
[21:58:34] <mrsun> ahh here found one datasheet says "rail to rail input/output"
[21:59:04] <mrsun> MCP6001
[21:59:51] <mrsun> 5.5V max... sigh
[21:59:56] <pcw_home> only 6v
[22:00:42] <mrsun> mm
[22:04:58] <mrsun> Common-Mode Input Voltage Range Includes VCC+ <-- does that mean the same thing ?
[22:06:33] <pcw_home> Yes as long as it also includes GND (or V-)
[22:07:00] <mrsun> but aparently not single supply
[22:07:05] <mrsun> sigh i hate op amps more and more
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[22:12:10] <mrsun> TS922IN might work ?
[22:12:14] <mrsun> runs at 12V atleast
[22:15:14] <pcw_home> should work
[22:18:58] <mrsun> now if only eagle could have had a model for it
[22:27:31] <DJ9DJ> gn8
[22:28:06] <mrsun> pcw_home, do i still need the 1k to gnd ?
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[22:28:23] <pcw_home> Yep
[22:28:31] <morfic-> pcw_home: thanks again, time to head home
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[22:30:25] <pcw_home> bye
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[22:51:08] <mrsun> pcw_home, as the opamps has like infinite input impedance i can connect both the opamps non inverting sides to the low pass filter right? (from what ive been told they can start oscillating if they are not tied down and this one is a dual opamp with one channel unused)
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[22:57:32] <pcw_home> I would just connect them both as followers but ground the unused + input
[22:59:02] <pcw_home> (since that opamp has ~100 nA bias current which will cause a ~10 mV offset into the 100K no need to double this)
[22:59:28] <mrsun> ahh ok =)
[23:01:14] <mrsun> thanks again, will try and route this tomorrow somhow =)
[23:01:43] <syyl_> had a good deal today :D
[23:01:50] <syyl_> http://dl.dropbox.com/u/24396704/wohlhaupter.jpg
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[23:33:11] <Tom_itx> does anybody here know of linux drivers for the D525 atom board?
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[23:37:41] <KimK> Tom_itx: Hi Tom. Linux drivers? You mean the D525 doesn't "just work"? Please keep us posted, I might be looking around for a "standard" CPU board myself.
[23:38:01] <Tom_itx> it works fine for linuxcnc
[23:38:13] <Tom_itx> i'm trying to set it up as a router
[23:38:31] <Tom_itx> and it won't see the onboard lan with a default debian install
[23:38:53] <KimK> Ah, OK.
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