#emc | Logs for 2011-05-08

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[01:25:01] <The_Ball> Can anybody recommend a good reference for g-codes?
[01:29:10] <Tom_itx> http://linuxcnc.org/docs/2.1/html/gcode.html
[01:31:55] <The_Ball> Tom_itx, thanks
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[01:54:09] <jdhNC> G Code for Dummies(r)
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[02:39:18] <Tom_itx> JT-Shop do you have a config file i could see for your mpg setup?
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[04:20:47] <ssi_> quiet tonight
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[05:47:37] <eli7777> hey, i have been very heaviely looking at maying a cnc router and i have been wondering witch stepper moters and diver board i should use
[05:52:00] <Jymmm> eli7777: Is this playing around hobby, or more than that?
[05:57:23] <eli7777> more then that. i was looking at using said router to engrave blocks i would sell at trade shows and stuff
[05:58:04] <Jymmm> A revenue source for you, so you need some reliability to it?
[05:58:06] <eli7777> i should probily say im a machinist, but making a cnc machine is a little out of my pay grade
[05:58:57] <eli7777> yes. i will need reliablility. its just there are so many to pick from and such a wide price range
[05:59:03] <Jymmm> Ok, *IF* you are going to use steppers, I would suggest the Gecko G540 http://www.geckodrive.com/g540-p-39.html
[05:59:30] <eli7777> should i look more in to using servos over steppers?
[06:00:09] <Jymmm> it depends on the budget initially
[06:00:57] <Jymmm> geckos have mid-band compensation (prevents stalling of steppers), many other stepper drivers do not.
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[06:01:51] <Jymmm> Mariss (the owner) is very smart and can talk your ear off if you ever get him on the phone.
[06:03:35] <Jymmm> I think everyone starts off with steppers, and only goes to servos when they've hit a certain point.
[06:03:55] <Jymmm> There is a cost factor as well
[06:04:00] <eli7777> ok. thankyou. what size of stepper moters would i need? i was thinking that i shouldnt need anything over 150oz/in.
[06:04:23] <Jymmm> how large a router?
[06:06:01] <Jymmm> what size "blocks" do you intend to make?
[06:06:09] <eli7777> 6"x 10"y 4"z and like i said it will only be doing engraving
[06:06:22] <Jymmm> how deep engraving?
[06:06:37] <eli7777> less then .050"
[06:06:51] <Jymmm> in metal? wood? plastic?
[06:07:25] <eli7777> metal and plastics
[06:07:56] <Jymmm> You'll need a high-speed spindle I'd suspect.
[06:08:41] <Jymmm> While 150ozin may be ok, it really is kinda small. 240+ would be better
[06:09:05] <Jymmm> you may want to push the envelope, or go faster, etc
[06:09:48] <eli7777> yes. i was looking at a drimal tool but i think i will end up using a 5amp router. it has a 1/4" collet and still runs at 35,000 rpms
[06:10:05] <Jymmm> dremel has serious roundout
[06:10:20] <Jymmm> sounds like a trim router
[06:10:30] <Jymmm> @ 35K rpm that is
[06:10:51] <eli7777> yes.
[06:10:52] <Jymmm> Actually geck sells steppers too,
[06:11:19] <Jymmm> When I bought stepper drives the G540 didn't exist and I was being cheap.
[06:11:49] <Jymmm> The G540 has built in breakout board, opto isolated, relay contacts and all the other goodies that you would want/need
[06:12:25] <Jymmm> You could always use it for another/bigger machien down the road too
[06:12:26] <eli7777> does the G540 have a way to tie in a probe or tool touch off?
[06:13:16] <Jymmm> No, that's not really it's functionality, That's where EMC2 would come into play.
[06:14:39] <Jymmm> But it does have a VFD control and chargepump
[06:15:05] <eli7777> VFD?
[06:15:53] <Jymmm> basically speed control for certain spindles that you might find on mills/lathes
[06:16:38] <Jymmm> as well as fwd, rev, etc
[06:17:32] <eli7777> i dont guess i would have a need for a controling spindle speed but just using m3 and m5 to turn on and off the router would be nice
[06:18:49] <Jymmm> Yeah, dont recall how many relays it can control
[06:19:26] <Jymmm> OUTPUT1 and OUTPUT2, so that's 2
[06:19:39] <Jymmm> rated at 50VDC@1A
[06:22:40] <eli7777> ok.. sry i was reading some more on the gecko
[06:22:51] <Jymmm> If you need the probe, you might need to look at an alternative. s I don't thin there is enough I/O for it. Though, since you only have 3 axis, you mihgt be able to use the I/O from that for it.
[06:23:08] <eli7777> is there anything i should look out for in my power supply?
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[06:23:40] <Jymmm> from a single parallel port that is. There are alternatives to parallel port like the mesa cards, but those are not motor drivers.
[06:24:31] <Jymmm> It's 23:00 here, try back around 06:00 and more folks should be around.
[06:25:06] <eli7777> ok let me ask this, in all the reading i have been doing i keep seeing were ppl have used the arduino to run driver boards. is that something i should look more in to?
[06:26:14] <Jymmm> Not really, as least not from what you've explained what you intend to do with it.
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[06:27:46] <Jymmm> you can downlaod the LiveCD of EMC if you wnat to look/play aorund with it
[06:27:53] <eli7777> ok. thankyou
[06:29:12] <eli7777> i did play with it some. but with out knowing much about the boards or steppers i would use it seemed like i couldnt do much
[06:29:55] <eli7777> i have been using deskcnc on my sharline mill. but i have found it lacking
[06:30:01] <Jymmm> eli7777: I'm just trying to steer you away from xylotex (which I have), and has overheating issues, no mid-band compensation and a MAX limit of 35V which *INCLUDES* BEMF
[06:30:37] <Jymmm> more voltage == more torque
[06:31:06] <Jymmm> my 240 ozin steppers could go to 50Volts
[06:31:56] <Jymmm> As for power supply, you just need a transformer or torroid, a bridge, and some capacitors. and a few fuses =)
[06:32:11] <Jymmm> that's it,
[06:32:31] <Jymmm> steppers use UNregulated power supplies
[06:32:47] <eli7777> really?
[06:32:58] <Jymmm> Yep, as they produce BEMF
[06:33:25] <Jymmm> http://www.geckodrive.com/ark-2/support.html?pid=91&id=102
[06:33:36] <eli7777> i thought i would have to have a power supply that ran a very constent voltage output
[06:34:02] <Jymmm> Read STEP MOTOR BASICS, and motor theory, motor power, (click on the button on the left)
[06:34:37] <Jymmm> Noooo, steppers produce voltage as they are slowing down
[06:35:35] <eli7777> ok i will read those.
[06:35:50] <Jymmm> Read POWER SUPPLY BASICS
[06:35:54] <Jymmm> same link
[06:37:09] <Jymmm> People will use switching power supplies only becasue they are more available and cheaper than a transnsformer, but the transformer is much better
[06:37:37] <eli7777> i was leaning more to getting a kit off ebay that had the brakeout board, driver steppers and power suply but some how i think i end up having problems with one of those
[06:38:08] <Jymmm> The G540 has all that, no headaches, no grief.
[06:38:39] <Jymmm> Hell if you blow the damn thing up, email mariss and fess up he'll give a ONE-TIME replacement at no cost.
[06:39:12] <Jymmm> if you tell hm how you blew it up that is
[06:40:04] <Jymmm> Plus even if you start with smaller motor/power supply, then go bigger later on, you can still use the same G540
[06:41:31] <Jymmm> If you have your own breakout board and the like, you cna always get http://www.geckodrive.com/g201x-p-32.html instead
[06:41:56] <Jymmm> which has higher voltage ratings
[06:42:02] <eli7777> but i will still have to get my steppers and power supply. im only seeing one stepper on geckos site
[06:42:42] <Jymmm> Yeah, 280 ozin NEMA23
[06:42:50] <Jymmm> for $60
[06:43:32] <Jymmm> Mariss has a dyno machine. so when he comes across various motors he tosses them on it to see how his drives will perform.
[06:44:06] <Jymmm> there was a yahoo post he made where he said he came across a stepper motor that was awesome, I suspect that's the one.
[06:44:26] <eli7777> the breakout board is just to isolate the computer from any short of overload right?
[06:44:36] <Jymmm> and the wiring too
[06:44:56] <Jymmm> It's a PITA to wire up a control box =)
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[06:46:30] <eli7777> i have dont it once before on the deskcnc board. setting up the homing and spindle was my least fav. of the indever
[06:47:04] <eli7777> but that didnt use the printer port
[06:47:06] <eli7777> done*
[06:47:22] <Jymmm> http://www.cnccookbook.com/img/OthersProjects/BoxOGeckos.jpg
[06:48:00] <Jymmm> just some pic I found on google, that happens to have individual geck drives
[06:48:05] <Jymmm> gecko
[06:48:47] <Jymmm> You can see the power supply... xfmr, fuses, cap and bridge (or diodes).
[06:50:27] <eli7777> is there a voltage i should be looking to run at? or just as high as the moters can handle?
[06:50:34] <Jymmm> Here's one using the G540... http://www.cnccookbook.com/img/OthersProjects/CNC/Fang_EBox_3.jpg
[06:51:30] <Jymmm> eli7777: You should read the STEPPER MOTOR BASICS tof the voltage details, but basically it's 20 to 25 times the rated phase voltage
[06:51:41] <Jymmm> s/tof/for/
[06:52:36] <Jymmm> eli7777: Heh, LOTS of enclosure examples... http://www.cnccookbook.com/CCEnclosureIdeas.html
[06:55:13] <eli7777> i think i will build it all inside of the computer case. so i only have one box to hookup to
[06:56:01] <Jymmm> Just be sure to shield the PC from the CNC electronics (just in case)
[06:56:55] <Jymmm> Yeah, the G540 would allow you to do all that as it's a nice tight fit.
[06:58:13] <eli7777> yeah, i just dont know what i would do with the 4 driver board
[06:58:45] <Jymmm> you can have it as a spare, as it'll unplug and plug into another slot if needed.
[07:02:38] <eli7777> yeah. then i would jsut have to get a relay for the spindle and tie in a tool touch off.
[07:03:08] <eli7777> how does emc even handle a probe or tool touchoff?
[07:03:26] <Jymmm> that *I* don't know, but I know it does.
[07:04:22] <Jymmm> heres a video http://www.youtube.com/watch?v=93xNiZ6FJUE
[07:05:28] <Jymmm> and another http://www.youtube.com/watch?v=AyB3HJlDNCo&NR=1
[07:06:47] <Jymmm> and a third http://www.youtube.com/watch?v=R9i4DbwZrKI&NR=1
[07:08:13] <eli7777> that makes me wonder if(how easy) emc will set the tool offset.
[07:08:41] <Jymmm> compared to ???
[07:09:00] <eli7777> working on a real cnc machine makes me lazy and i dont like doing paper offset with a router bit. i always stab the part
[07:09:37] <Jymmm> Well, I cna't comment there. I use a flashlight =)
[07:09:41] * mrsunshine_ got himself a Z offsetter
[07:09:53] <mrsunshine_> 50mm high, +- 0.005mm :P
[07:10:00] <eli7777> a flashlight?
[07:10:30] <Jymmm> eli7777: Yep. Held at an angle, then I watch the shadow till it touches the tool tip =)
[07:10:59] <Jymmm> manually lowering Z that is
[07:12:05] <Jymmm> eli7777: (I never could get the paper to work for me correclyl)
[07:12:51] <eli7777> low tech but effectif. i have just got use to having a macro to touch off the tool
[07:13:16] <eli7777> i use paper at mork alot. mostly on lathes
[07:13:28] <eli7777> work*
[07:15:18] <eli7777> @ mrsunshine, how does your z offsetor work? you manually lower Z until it touches the offseter and you manually set the tools offset?
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[07:27:40] <mrsunshine_> eli7777, ye .. i was hoping i could put a cable in it, as its a LED that lights up
[07:27:49] <mrsunshine_> and put that directly to emc
[07:28:17] <mrsunshine_> tho as i do not know how it looks inside i do not dare open it ... =)
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[09:40:41] <paragon-ws> Morning All...
[09:45:08] <paragon-ws> I been pondering over a future project for the Denford Starmill. I was thinking of making a spindle which would be of the form of an R8 taper so as to fit inside the R8 spindle of the Starmill. The spindle is for PCB routing.
[09:48:43] <paragon-ws> I am considering using a RC BLDC motor with a dia of less than an r8 collet so it can be installed and removed swiftly. These motors have high RPM and torque. What do you think of the feasibility of employing a motor of this type for this duty?
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[12:24:27] <JT-Shop> Tom_itx: are you about?
[12:36:26] <Tom_itx> yup
[12:57:09] <jthornton> I'm putting the MPG info on my web page now
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[12:58:12] <awallin_> miles per gallon ? :)
[12:58:21] <jthornton> lol
[12:58:37] <Tom_itx> yup
[12:58:48] <Tom_itx> just catching up on the morning logs
[12:59:32] <Tom_itx> JT-Shop, i was looking at this one: http://www.anderswallin.net/2006/11/jogging-emc2/
[12:59:41] <Tom_itx> from the wiki link
[13:00:29] <awallin_> hah :)
[13:00:53] <Tom_itx> would changing the references from 5i20 to 7i43 in that work or are there too many other differences?
[13:02:29] <awallin_> if the driver is similar(ish) then it should me much the same as 5i20
[13:02:42] <awallin_> don't know about the electrical specs on the 7i43..
[13:03:29] <Tom_itx> i also notice in the default 7i43.ini has num_encoders=0 is that a simple matter of changing that to 1?
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[13:03:49] <Tom_itx> and making sure the pins match
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[13:03:56] <awallin_> don't know, I haven't worked with the new-style fpga-configs at all...
[13:04:22] <jthornton> Tom_itx: http://gnipsel.com/shop/hardinge/hardinge.xhtml
[13:04:38] <awallin_> for MPG you probably don't need a hardware encoder counter on the FPGA, a software hal encoder counter will do
[13:04:51] <Tom_itx> Page Not Found
[13:04:55] <Tom_itx> woops
[13:05:29] <jthornton> fixed
[13:05:35] <Tom_itx> well at this point i don't know what files affect hardware and software
[13:06:03] <Jymmm> jthornton: What is this adware you have?
[13:07:47] <Tom_itx> seems the other one has alot more going on in the .hal file
[13:08:15] <awallin_> wouldn't encoder.counter-mode=1 allow you to specify the actual distances/click you want instead of 1/4th like in your file
[13:09:19] <awallin_> og there is encoder.n.x4-mode also...
[13:09:21] <awallin_> oh
[13:09:23] <Jymmm> jthornton: What is this adware you have? http://i54.tinypic.com/2cfwhli.jpg
[13:09:32] <Tom_itx> where's a reference to those variables?
[13:10:51] <awallin_> http://www.linuxcnc.org/docs/2.4/html/man/man9/encoder.9.html
[13:12:36] <Jymmm> Does anyone else get some adware going here http://gnipsel.com/shop/hardinge/file/doesnotexist.xhtml
[13:13:26] <Tom_itx> he gets paid big bux for those
[13:14:25] <awallin_> hotels and such...
[13:14:29] <Jymmm> I dont see jthornton ever putting up ads like that. I think he might have been hijacked
[13:14:49] <Jymmm> at least his 404 files might have been
[13:15:12] <Jymmm> It's not google ads either.
[13:15:41] <Tom_itx> from his domain sponsor
[13:15:58] <Jymmm> Maybe, but I wouldn't think so
[13:17:21] <Tom_itx> click on the privacy policy and that's where it came from
[13:17:47] <jthornton> Jymmm: what is that
[13:18:17] <Jymmm> jthornton: That shows up on your website any time a non exsitant link is accessed
[13:18:24] <Jymmm> jthornton: aka 404's
[13:18:42] <jthornton> I need to see if I can change that to something else
[13:19:04] <Jymmm> jthornton: Look for "404 Customization"
[13:19:18] <jthornton> prob some setting on the host
[13:19:35] <Tom_itx> http://www.fourwalledcubicle.com/me
[13:19:38] <Tom_itx> try one like that
[13:19:41] <Jymmm> jthornton: Do you pay for hosting?
[13:19:53] <Tom_itx> he customized all his
[13:20:00] <Tom_itx> 400 messages that is
[13:20:33] <Jymmm> The easiest 404 customization is to just direct them to the webroot.
[13:20:45] <Tom_itx> where's the fun in that?
[13:20:51] <jthornton> yes
[13:21:44] <Jymmm> jthornton: Then that doens't seem right to me. I'd ask them if that's them or see if you've been hijacked. Either way customizing the 404 should fix that.
[13:22:08] <Jymmm> jthornton: and change your password wouldnt be a bad thing either
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[13:27:08] <Tom_itx> jthornton, thanks for the file btw
[13:27:31] <jthornton> np
[13:28:22] <Tom_itx> subbing 7i43 for 5i20 seem reasonable in it?
[13:29:11] <Tom_itx> i've got plenty of time to read since the stuff won't be here till mid to late next week anyway
[13:29:44] <jthornton> that should work
[13:30:05] <Tom_itx> i wonder why the other .hal file was alot more complex
[13:30:21] <jthornton> Jymmm: http://gnipsel.com/shop/machine-shop.xhtml
[13:30:48] <Tom_itx> The webpage cannot be found
[13:30:56] <Tom_itx> bland but works
[13:31:00] <Tom_itx> same default as mine
[13:31:06] <jthornton> quick and dirty
[13:31:09] <Jymmm> jthornton: "Well it looks like I screwed up a link."
[13:31:18] <jthornton> lol
[13:31:22] <Tom_itx> heh
[13:31:40] <Jymmm> jthornton: it works for me =)
[13:32:39] <jthornton> Tom_itx: awallin has a lot more going on with his hal file :)
[13:32:49] <Tom_itx> i know
[13:32:56] <Tom_itx> i like the idea of the pushbutton though
[13:33:02] <Tom_itx> on/off
[13:33:05] * jthornton heads to the shop to start hanging OSB on the walls
[13:33:16] <Tom_itx> is alot of it for that?
[13:33:30] <jthornton> I didn't study it
[13:33:51] <Tom_itx> i haven't either yet
[13:33:59] <Tom_itx> i gotta figure out what all the stuff is first
[13:34:39] <Tom_itx> match8 looks handy
[13:34:59] <Tom_itx> byte pattern matching
[13:40:48] <Jymmm> Since some of you deal with uC's, thought you might appreciate this... http://www.geek.com/articles/games/game-developer-david-braben-creates-a-usb-stick-pc-for-25-2011055/
[13:47:46] <Jymmm> In the US, CAT 5/6 comes in 1000ft boxes, what length is it sold at in the UK ?
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[14:20:17] <awallin> 100m cat-5 UTP, 36.90eur at the local DIY...
[14:20:43] <Jymmm> 100m, ok. that's what I wanted to know =)
[14:20:49] <Jymmm> ty
[14:20:58] <awallin> that's 328 feet
[14:21:14] <Jymmm> is that a BOX of cat5/6?
[14:21:14] <awallin> not sure about uk, they could be all into inches feet and miles still... :)
[14:21:16] <Tom_itx> rather short spool
[14:21:20] <awallin> it's a spool
[14:21:32] <Jymmm> awallin: Oh, what about a BOX of it?
[14:21:52] <Jymmm> Tom_itx: Yeah, not even the 300M rthernet limit
[14:21:59] <Jymmm> ethernet
[14:22:01] <awallin> they have 300meters for 99eur also
[14:22:11] <Jymmm> Oh, ok. OUCH
[14:22:36] <awallin> the place where I am looking might not be the cheapest place
[14:22:49] <Jymmm> someone's getting robbed at 99 eur
[14:23:09] <Jymmm> it's avg $30 USD for 1000ft of CAT5
[14:23:28] <Tom_itx> what about 6?
[14:23:28] <Jymmm> 304.8m
[14:23:30] <Tom_itx> about the same?
[14:23:37] <Tom_itx> maybe a little more
[14:23:38] <Jymmm> slightly more
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[14:26:32] <awallin> haven't really researched who would have cat5 or cat6 cheap...
[14:26:47] <Jymmm> Most ppl just do wifi
[14:27:17] <Jymmm> but unless you have a VPN setup, it's not secure
[14:27:31] <awallin> wifi pretty much sucks if you have 40mbit or more broadband...
[14:27:44] <awallin> that is if you want to utilize that bw...
[14:35:29] <Jymmm> Anyone rememeber when you bought a PC case it actually came with a PS <sigh>
[14:38:42] <anonimasu> awallin: elfa.se perhaps
[14:39:34] <Jymmm> You're kidding me right? $800 for a PC Case??? http://www.newegg.com/Product/Product.aspx?Item=N82E16811133089 and no Ps either
[14:41:42] <Tom_itx> oh it's such a nice box though
[14:41:57] <Jymmm> so is a pizza box,
[14:42:05] <Tom_itx> not if it's empty
[14:42:27] <Jymmm> Free PC case with every pizza ordered
[14:42:45] <Jymmm> http://www.2dayblog.com/images/2007/december/pizza_pc_1.jpg
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[15:58:01] <Tom_itx> JT-Shop
[15:58:22] <Tom_itx> setting counter-mode 0 allows you to count up as well as down?
[15:58:27] <Tom_itx> since it's in quad mode
[15:58:36] <Tom_itx> otherwise would it just count up?
[15:59:03] <Tom_itx> encoder.03.counter-mode that is..
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[16:01:01] <Tom_itx> i don't see 'filter' in the doc file
[16:01:36] <JT-Shop> Enables counter mode. When true, the counter counts each rising edge of the phase-A input, ignoring the value on phase-B. This is useful for counting the output of a single channel (non-quadrature) sensor. When false (the default), it counts in quadrature mode. encoder.N.capture-position.tmax s32 rw Maximum number of CPU cycles it took to execute this function.
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[16:02:22] <JT-Shop> that might be a host mot 2 thing
[16:02:52] <JT-Shop> http://www.linuxcnc.org/docview/html/man/man9/hostmot2.9.html
[16:03:26] <Tom_itx> i must be reading an older ver
[16:03:44] <Tom_itx> 2.4.6
[16:03:57] <Tom_itx> QT run brb
[16:04:10] <pcw_home> HostMot2 has a up/down mode this is _not_ a 1X quadrature mode
[16:05:02] <JT-Shop> pcw_home: I copied from the wrong place :/
[16:06:03] <pcw_home> yeah, the software encoder has a 1X mode (good for MPGs)
[16:06:23] <Tom_itx> does it count up as well as down?
[16:06:34] <pcw_home> (if you want the detent to be synced with the count)
[16:06:42] <pcw_home> Yes
[16:06:51] <Tom_itx> how's that done without quad?
[16:07:11] <pcw_home> http://www.linuxcnc.org/docview/html//man/man9/encoder.9.html
[16:07:14] <Tom_itx> brb..
[16:07:53] <pcw_home> it is quadrature just with x4 mode off
[16:09:16] <JT-Shop> pcw_home: this is my MPG setup http://gnipsel.com/shop/hardinge/files/mpg.xhtml
[16:14:54] <pcw_home> JT-Shop: yes you can use the HostMot2 counters as well but they only support 4X quadrature mode
[16:14:55] <pcw_home> People with 100 count MPGs with detents often want the counts to follow the clicks which needs 1x mode
[16:15:54] <JT-Shop> does my scale setting over come that?
[16:17:12] <pcw_home> it might not really sure.
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[16:30:16] <pcw_home> because the (4x) counter is reset at startup and a dial should be located at a detent at startup
[16:30:17] <pcw_home> 4X mode should be in sync but in may not count at the desired place relative to the detent
[16:31:24] <JT-Shop> just looking at the prints I made the MPG has connections to A and B but not /A and ?b
[16:31:33] <JT-Shop> /B
[16:32:12] <JT-Shop> on the 7i33 card
[16:33:00] <pcw_home> I guess another way to do this would be a higher res encoder and a speaker/relay clicker at desired intervals
[16:33:01] <pcw_home> Yeah most MPGs would be single ended so you would not use the /A /B
[16:34:46] <pcw_home> I would think the most desirable mode for a MPG with detents would be to count at 1/2 way between the detent rest positions
[16:35:49] <anonimasu> hmm
[16:35:54] <pcw_home> I think this is possible in 4 x mode but may need a count of 2 offset inserted in the correct place
[16:36:02] <anonimasu> my handwheel for the big mill(like heidenhain does) dosent have detents
[16:36:08] <anonimasu> it's just a manual wheel, with a scaling factor
[16:38:32] <pcw_home> In that case 4X mode is fine as is (I guess a clicker could be added audible increments)
[16:40:31] <anonimasu> I dont see a advantage of _clicks_
[16:40:40] <anonimasu> for that I use incremental jog and the button
[16:40:41] <anonimasu> :)
[16:41:17] <pcw_home> well it gives you incremental jog on the MPG
[16:43:14] <anonimasu> (the more fancy pendants have a button for incremental and axis buttions for doing so)
[16:44:30] <pcw_home> I guess it depends on whether you want to turn a knob for 7 clicks or hit a button 7 times
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[17:29:45] <Tom_itx> so is there a 'best' approach?
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[17:37:27] <Tom_itx> mmm i've got 2.4.6 should i be running something newer?
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[17:40:29] <SWPadnos> pcw_home, re: offsetting so the "click" is between detents, you could achieve that with x1 counting and connecting the appropriate phases to the counter
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[17:46:33] <pcw_home> Right, I was thinking more about HostMot2 (which only has 4X)
[17:46:35] <pcw_home> I wonder if anyone has tried software generated clicks with a regular encoders as a cheap substitute for a MPG with detents
[17:47:03] <Tom_itx> i was gonna but mine are 500 cpr
[17:47:04] <SWPadnos> I'm not sure you'd hear them in a shop
[17:47:06] <Tom_itx> and more
[17:47:19] <Tom_itx> no but you'd feel them
[17:47:34] <Tom_itx> mmm not on audible clicks
[17:47:43] <SWPadnos> ding! :)
[17:48:02] <Tom_itx> wearable tazer
[17:48:13] <SWPadnos> too many mis-clicks in that case
[17:48:29] <SWPadnos> one taze forward, several tazes back
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[19:04:19] <gene75> Got printing problem guys cam anyone help?
[19:04:48] <archivist> printing, on a cnc ?
[19:06:03] <gene75> Yeah. I can see the printer at localhost:631, named epson, but neither lp, nor lpr can find the file to print when I lookinhg at it in the dir I am cd'd to...
[19:07:05] <gene75> I even sent it a test page from here, which worked.
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[19:10:04] <gene75> I have a logic error in a subroutine based bit of code, and I can't see it when looking at the code in an editor with an airmail stamp sized window.
[19:11:49] <jthornton> post it on pastebin then open it up at your other computer
[19:12:38] <gene75> ok, I can do that. Thanks
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[19:25:06] <willburrrr2003> Good morning all :)
[19:25:44] <willburrrr2003> I finally have my motors mounted and wired into my controller, been working on calibrating the movement of my z axis this morning
[19:27:10] <willburrrr2003> I have the backlash figured out, but falling short of a 1" movement by .001" . I am using leadscrew pitch of 16.0375 (been playing with the number a bit trying to dial it in)
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[19:30:01] <willburrrr2003> if I have leadscrew pitch of 16.04 i move .001" past 1" movement, and if I have 16.0375 I am .001 under 1" movement...can I just split the difference?
[19:31:06] <JT-Shop> seems like an odd number for a leadscrew
[19:32:14] <willburrrr2003> I know, I counted 16tpi...but it falls short quite a bit....that's why I have been playing with the number to try and get it dialed in
[19:33:15] <willburrrr2003> it's a harbor freight mini-lathe I am working with
[19:33:22] <Tom_itx> metric?
[19:33:47] <Tom_itx> find a metric thread that matches it
[19:34:07] <willburrrr2003> not supposed to be, but neither is the cross slide scew and it IS a metric thread pitch I found out from researching
[19:34:19] <Tom_itx> we're talking harbor freight here
[19:34:29] <willburrrr2003> hehe I know
[19:34:58] <Tom_itx> if one is, they both will be
[19:36:25] <willburrrr2003> metric screws with standard " measurement marks on the dials....I know for a fact that is what they did on the cross-slide, bet your right and they did the same thing on the lead screw
[19:38:18] <willburrrr2003> it's nice to be this close to having my machine up and running, been working on it for awhile now :D I actually made my first test cuts lastnight though axis
[19:39:25] <willburrrr2003> I will re-mesure the leadscrew using metric, and see where that gets me...as I think your most likely right Tom
[19:42:54] <willburrrr2003> Thasks for the poke in the brain Tom, off to give it another shot :)
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[19:43:52] <anonimasu> where is tomp when you need him
[19:44:54] * JT-Shop cuts out an OSB template on the VMC
[19:52:03] * anonimasu cleans a glass scale
[19:54:37] <anonimasu> 950 euro one
[19:54:40] <anonimasu> -_-
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[21:19:46] <Tom_itx> anonimasu /me to the rescue
[21:20:17] <Tom_itx> wait.. i read that as a typo
[21:20:21] <Tom_itx> damn irc
[21:20:53] <Tom_itx> anonimasu was it bad or just dirty?
[21:21:00] * JT-Shop thinks Tom_itx has been drinking LOL
[21:21:08] <Tom_itx> DrPepper
[21:21:17] <Tom_itx> it has that effect
[21:21:48] <Tom_itx> actually i should wake up first before i start typing
[21:22:36] <Tom_itx> JT-Shop reading about the mpg there seems to be a software and hardware method of doing it?
[21:22:47] <Tom_itx> and yours is software?
[21:24:23] <Tom_itx> or is that wrong..
[21:27:11] <anonimasu> full of coolant
[21:27:23] <anonimasu> maybe damaged we'll see tomorrow
[21:27:26] <JT-Shop> mine is hardware
[21:27:43] <Tom_itx> and it reads on the detent?
[21:27:53] <Tom_itx> well, it changes between detents
[21:32:11] <Tom_itx> some of this will be more clear (I hope) when i have hardware
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[21:40:25] <JT-Shop> I don't have a clue when it "reads" and don't care so long as it move 0.001" when I move it one click :)
[21:41:01] <Tom_itx> good call
[21:41:02] <Tom_itx> :D
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[21:41:11] <JT-Shop> I think a lot if the discussion lately on mpg's is splitting hairs
[21:41:15] <Jymmm> JT-Shop: do you have a touch probe /tool offset on any of your machines?
[21:41:17] <Tom_itx> i know
[21:41:20] <Tom_itx> i understand that
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[21:41:43] <JT-Shop> Jymmm: touch probe no
[21:42:01] <JT-Shop> I don't find any need for one
[21:42:06] <Jymmm> JT-Shop: so you set height manually?
[21:42:16] <Tom_itx> i'll have to figure out what pins the signals are on on my board
[21:42:22] <JT-Shop> yea, just takes a second and is very accurate
[21:42:27] <Jymmm> k
[21:42:47] <JT-Shop> Tom_itx: you can do a dmesg after you load it up I think that works on that one too
[21:42:59] <Tom_itx> yeah i read about that
[21:43:02] <JT-Shop> Jymmm: a dowel is your friend
[21:43:26] <Tom_itx> i'm using the 7i47 along with it so does that effect it any?
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[21:43:53] <Tom_itx> basically using it as a buffer
[21:43:54] <JT-Shop> not as far as pinouts go AFAIK
[21:44:19] <Tom_itx> well, i've got a scope and logic analizer if it comes to that
[21:44:52] <Tom_itx> i don't think it will
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[21:49:14] <JT-Shop> it's pretty simple really
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[21:57:24] <Tom_itx> i just add that hal file in the 7i43.ini file in the hal section right?
[22:01:43] <JT-Shop> I'm not sure I understand your question
[22:02:01] <Tom_itx> to use your hal file for the mpg
[22:02:15] <Tom_itx> i add a reference to it in the 7i43.ini file in the hal section
[22:02:32] <JT-Shop> yea, just change the 5i20 pin to the correct 7i43 pin
[22:02:39] <Tom_itx> yep
[22:02:52] <Tom_itx> which i'll probably have to wait for
[22:03:05] * JT-Shop just trashed the second piece of OSB on the same spot :/
[22:03:17] <JT-Shop> yea
[22:03:26] <Tom_itx> roughing outlets?
[22:03:55] <JT-Shop> first one too short, second one outlet on wrong side of line :/
[22:04:16] <JT-Shop> I actually got mad after the second one
[22:04:33] * JT-Shop gets back on that horse
[22:04:38] <Tom_itx> fire the help
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[22:10:53] <willburrrr2003> working on my leadscrew movement, verified I have 16tpi. entered 16tpi in the stepconf wizard. measured backlash of .039. performed 3 movements. first command was to move -.05 inche, loal indicator says I moved .051 , then told it to go to -1 inch and dial indicator says total movement was .99 inch, then told it to go back to 0 and it returned to dead center of zero mark on dial indicator.
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[22:11:28] <willburrrr2003> any ideas why the discrepancy?
[22:12:45] <JT-Shop> backlash
[22:13:18] <JT-Shop> Tom_itx: I think I cut his pay in half and ...
[22:13:33] <Tom_itx> what's half of free?
[22:13:41] <JT-Shop> not much :)
[22:14:16] <JT-Shop> I only have 15 sheets left on site so I better start getting it right
[22:14:42] <Tom_itx> or you'll have plenty of scrap for chip shields
[22:15:24] <Jymmm> JT-Shop: swiss cheese OSB better that kindling OSB
[22:16:42] <Jymmm> JT-Shop: and measure once, cut twice ;)
[22:16:48] <JT-Shop> lol
[22:17:20] <Tom_itx> he did on the first one
[22:17:28] <Tom_itx> it was still too short
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[22:18:07] <willburrrr2003> if it is backlash, why would it move more than I want at a half inch move then move less then i want when I continue on to 1 inch (g1 -0.5 =.51" movement, then without changing direction g1 -1.0 and movement = .99", then tell it to move in other direction which is where I expect backlash to be a propblem (and caluculated and entered as .039) with g1 0.0 and it moves right to 0.0
[22:18:14] <Jymmm> He's a professional, he should have a board stretcher to fix that.
[22:18:59] <Tom_itx> cheap chinese sheet
[22:21:18] <willburrrr2003> I guess what I am asking is, how can backlash cause what I am seeing?
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[22:26:03] <Tom_itx> maybe velocity kept it moving a bit after the first move
[22:26:18] <Tom_itx> .001
[22:26:53] <Tom_itx> 2nd move took out the slack and cut to .99
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[23:35:13] <Jymmm> jthornton: Build one and they wil come... http://www.youtube.com/watch_popup?v=qybUFnY7Y8w
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