#emc | Logs for 2008-07-28

[01:47:16] <jmkasunich> cradek: do you still have that enco free-shipping code? (and is it still valid?)
[01:48:10] <jmkasunich> hmm, I bet it doesn't apply to surface plates - even small ones
[01:49:24] <jmkasunich> I think I want a 9x12 or 9x9 for stuff that involves applying the plate to the work
[01:49:41] <cradek> I got my 12x18 with free shipping some time ago.
[01:50:32] <cradek> I always search on one of the web bbses like http://bbs.homeshopmachinist.net/
[01:50:58] <jmkasunich> ah, ok
[01:51:08] <cradek> http://bbs.homeshopmachinist.net/showthread.php?t=29706&highlight=enco+code
[01:51:26] <jmkasunich> looking at the enco site, their cheap plates are grade B, +/- 0.0001
[01:51:31] <jmkasunich> over 9", that is nothing great
[01:51:35] <cradek> sometimes you have a pick of codes
[01:52:05] <jmkasunich> oh, free shipping on $50 or more.....
[01:52:40] <jmkasunich> the plate is only $17
[01:53:12] <cradek> it's easy to pad that to $50...
[01:53:23] <jmkasunich> sure
[01:53:30] <jmkasunich> but then you gotta pay the bill
[01:53:36] <fenn> 12x18 is $37 and still free shipping
[01:53:37] <cradek> and probably worth it to avoid paying for shipping that
[01:53:53] <jmkasunich> fenn: I have a 12x18 that is better quality than theirs
[01:53:59] <fenn> oh, you wanted a smaller one?
[01:54:03] <jmkasunich> certified 0.00008
[01:54:04] <cradek> the 9x12 is $14.95 today
[01:54:07] <jmkasunich> yes, lighter
[01:54:16] <fenn> granite isn't the best for that then
[01:54:25] <jmkasunich> 9x12 is 30 lbs
[01:54:28] <jmkasunich> I can deal with that
[01:54:44] <cradek> 30lb is a lot easier to throw around than 85
[01:54:58] <cradek> (although 85 is still pretty easy)
[01:55:11] <jmkasunich> says you
[01:55:26] <jmkasunich> it depends on what you are doing with it
[01:56:18] <jmkasunich> you put the compound on it right side up - then pick it up, flip it over, and lay it on the surface to be worked, which in this case is a couple inches above elbow height
[01:56:46] <jmkasunich> I did 37 rounds of moving the 74 lbs casting to the plate, at a nicer height
[01:57:07] <jmkasunich> I think my plate is more than 85 lbs too - its 4" thick
[01:59:00] <cradek> $ units 12in*18in*4in*2.75gm/cm3 lb
[01:59:00] <cradek> 85.838446
[01:59:14] <jmkasunich> where did you get the density number?
[01:59:22] <cradek> google "granite density"
[01:59:24] <jmkasunich> (enco says 85 lbs for the 12x18x3)
[01:59:39] <cradek> that's a bizarre coincidence
[01:59:46] <fenn> interesting graph of human strength vs position on page 2: http://www.wholeearth.com/uploads/2/File/documents/vermont_farm_women.pdf
[02:00:27] <jmkasunich> by that math, the 9x12 is only 21 lbs ;-)
[02:01:04] <cradek> huh
[02:01:13] <cradek> there must be different kinds of granite?
[02:01:37] <jmkasunich> I'm sure there are
[02:01:49] <jmkasunich> dunno how much the density varies tho
[02:02:01] <jmkasunich> enco's weights may be shipping weight?
[02:03:11] <cradek> that could be. I think mine came in a wood box of some kind
[02:04:00] <jmkasunich> I'm torn - the plate certainly would be handy right now, but then how long till I use it again?
[02:04:12] <cradek> you could hold something down with it...
[02:04:25] <cradek> use it as a cutting board
[02:04:39] <jmkasunich> that would wear it
[02:05:28] <fenn> 2.6g/cm^3 is lighter than aluminum (2.7)
[02:06:39] <fenn> i think its more like 2.96
[02:07:33] <cradek> the internet thinks it's 2.7 - 2.75
[02:08:01] <cradek> a 12x18x4 aluminum slab would weigh a lot too. it wouldn't surprise me if they were similar.
[02:08:01] <jmkasunich> specifically black granite?
[02:08:41] <cradek> no
[02:09:14] <fenn> "A standard reference notes that the average density of granite is 2.667 grams/cc and the range of densities is 2.516-2.809 grams/cc."
[02:09:54] <fenn> of course "granite" surface plates may not fit the geologist's idea of what a granite is
[02:11:32] <toastydeath> are we talking about scraping
[02:11:40] <jmkasunich> sort of
[02:11:51] <toastydeath> aluminum straightedge?
[02:11:56] <jmkasunich> no
[02:11:58] <toastydeath> k
[02:12:08] <jmkasunich> granite surface plates, and what they weigh
[02:12:26] <toastydeath> check msc and the shipping weight?
[02:12:37] <jmkasunich> my 12x18x4 is more than I want to be flipping upside down - I have an 8x9 surface on a 250 lbs casting that I want to work
[02:12:45] <fenn> topic is roughly: what is the best thing to carry around to test blue
[02:12:51] <jmkasunich> I'm looking at enco's "30 lb" 9x12x2
[02:13:13] <jmkasunich> quotes because their stated weights don't work out when you do the math
[02:13:16] <cradek> jmkasunich: do you have a bathroom scale? you could just weigh and measure yours to settle the point
[02:13:28] <toastydeath> in that form factor i know they make cast iron plates, that use webbing and stuff that are specifically for portability
[02:13:29] <jmkasunich> yes, I could
[02:13:34] <jmkasunich> but I'm lazy
[02:13:35] <toastydeath> dunno where to find them though, just seen them.
[02:13:40] <fenn> jmkasunich: it roughly matches up with another internet posting (9x12x1 = 13lbs)
[02:14:01] <jmkasunich> toastydeath: the 9x12 from enco is approximately free ($15)
[02:14:05] <toastydeath> snap
[02:14:07] <fenn> the 13lbs is supposed to be light weight
[02:14:10] <cradek> heh
[02:14:17] <fenn> even though its density is 3.3
[02:14:31] <cradek> man with one surface plate knows what flat is...
[02:14:40] <jmkasunich> heh
[02:14:53] <cradek> of course that's the first thing I'd do with a second surface plate
[02:14:58] <jmkasunich> spot the 9x12 two places on the 12x18
[02:15:07] <fenn> man with atomic surface plate get confused when he put it on satellite?
[02:16:23] <fenn> * fenn wonders if that was too many allusions at once
[02:16:25] <jmkasunich> cradek: did you say you got a gallon of way oil from enco?
[02:16:47] <cradek> I ordered it, yes
[02:17:40] <jmkasunich> trying to think of things to fill out the $50
[02:18:11] <cradek> can't go wrong with cheap end mills
[02:18:22] <cradek> have any roughers? they make 3/8 and 1/2
[02:18:36] <jmkasunich> thats a thought - I don't have roughers
[02:18:45] <cradek> you'll never look back - they are great.
[02:18:55] <toastydeath> it's true.
[02:20:14] <fenn> why are steel surface plates so much more expensive?
[02:20:36] <jmkasunich> granite can be lapped flat, steel are scraped (I think)
[02:20:56] <jmkasunich> "number of products: 196"
[02:21:01] <toastydeath> many steel plates are lapped, too
[02:21:08] <jmkasunich> any suggestions to narrow down the selection of roughers
[02:21:18] <cradek> jmkasunich: I remember you also need 246 blocks - that will surely get you over $50 :-/
[02:21:22] <toastydeath> my guess would be economy of scale, and also weight
[02:21:23] <jmkasunich> (I already filtered by 3/8" shank to fit my holders)
[02:21:36] <toastydeath> jmkasunich: don't get a semi-rougher.
[02:21:43] <jmkasunich> cradek: I saw those - $70ish
[02:21:49] <jmkasunich> but I don't "need" them
[02:22:01] <toastydeath> also the less expensive roughers are cut like a leadscrew, rather than form relief
[02:22:07] <toastydeath> and those tend to pull out.
[02:22:19] <cradek> centercutting, .375 cut, .375 shank => 7 choices
[02:23:58] <jmkasunich> hmm, $54 for a set of 4 - 1/4, 5/16, and 3/8 with 3/8 shanks, and 1/2 with 1/2 shank
[02:52:02] <jmkasunich> order total 53.31
[02:52:12] <jmkasunich> I tried to get it closer to $50....
[02:52:42] <jmkasunich> plate, way oil, two roughers, and a 1/8 reamer that I've been meaning to get for a while
[02:53:39] <cradek> did you get a full gallon?
[02:53:51] <jmkasunich> yeah, I didn't see anything smaller
[02:53:58] <cradek> I would have been happy with less but it's not too bad.
[02:54:09] <cradek> I hear some stuff comes as 5 gal.
[02:54:20] <jmkasunich> that was the other choice
[02:57:32] <jmkasunich> sometimes threading email clients are a pain
[02:57:48] <jmkasunich> it paired this order ack with the one from a couple months ago
[02:58:15] <cradek> that must be a pseudothread - guessed by subject.
[02:58:21] <jmkasunich> yeah
[02:58:34] <jmkasunich> maybe its trying to tell me to clean out my inbox once in a while
[02:58:34] <cradek> ideally you could turn that off and keep the real threading
[03:00:09] <jmkasunich> I guess now I have an excuse for not working on the grinder for a few days
[03:00:24] <cradek> as I do with my lathe
[03:00:28] <jmkasunich> heh
[03:00:44] <cradek> (dangit)
[03:00:56] <jmkasunich> I spent some time tonight checking the 1" x 3/4" x 12" parallels I bought a while back
[03:01:01] <jmkasunich> gonna need those for the grinder work
[03:01:35] <cradek> those are some big parallels
[03:01:37] <jmkasunich> turns out the height matching is only so-so - about 0.0004
[03:01:47] <cradek> ick
[03:01:56] <jmkasunich> they were on sale, something like $30 for the pair
[03:01:56] <cradek> if you had a grinder, you could fix them!
[03:02:09] <jmkasunich> that thought has crossed my mind ;-)
[03:02:28] <cradek> my chinese set is great. they are matched well and also the exact marked height (to .0001 afaict)
[03:02:29] <jmkasunich> for the immediate need, it is sufficient to know the mismatch
[03:02:43] <jmkasunich> (I won't be using them as parallels - more like straightedges)
[03:03:28] <jmkasunich> what's funny is that the 3/4" dimension is better matched
[03:03:40] <jmkasunich> about 0.00015
[03:04:34] <jmkasunich> * jmkasunich drools at the master precision level
[03:04:43] <jmkasunich> wouldn't need the plate if I had that
[03:05:21] <jmkasunich> but I doubt the bench I have the grinder on is stable enough
[03:05:29] <tomp2> anonimasu: what is "jone's drive"
[03:05:35] <jmkasunich> jon elson
[03:05:48] <tomp2> jon=jone?
[03:06:10] <jmkasunich> Jon E.
[03:06:13] <jmkasunich> http://pico-systems.com/motion.html
[03:06:14] <tomp2> ah!
[03:07:54] <jmkasunich> one of these days: http://www.use-enco.com/CGI/INSRIT?PARTPG=INLMKD&PMPXNO=951530&PMAKA=638-7780
[03:08:40] <cradek> me too. can't justify it for as rarely as I'd use it though.
[03:10:09] <jmkasunich> I'd be able to use it on the grinder in a number of ways
[03:10:22] <cradek> then of course http://www.use-enco.com/CGI/INSRIT?PARTPG=INLMKD&PMPXNO=4822332&PMAKA=240-0352
[03:10:32] <jmkasunich> no
[03:10:53] <jmkasunich> the existance of the enco one is what takes it from a "never worth it" to "one of these days" item
[03:11:09] <cradek> yeah. wonder if it's any good though.
[03:11:17] <jmkasunich> I have my dad's starret machinest level, but that is only 0.005 per foot, not 0.0005
[03:11:36] <jmkasunich> levels are easy enough to check
[03:11:53] <tomp2> spin it, same reading?
[03:12:01] <cradek> yeah if it checks flat and you can reverse it, it's good
[03:12:03] <jmkasunich> put it on the plate, and level the plate (wedge or screw under one end)
[03:12:09] <jmkasunich> not quite
[03:12:25] <jmkasunich> spin it and reads the same just means it is zeroed (and that is usually adjustable)
[03:12:40] <jmkasunich> the next step is "is one graduation really 0.0005 per foot?"
[03:12:48] <cradek> oh well that's true.
[03:13:05] <jmkasunich> test that with feeler gages - 0.001 under one end, 0.0015 under the other
[03:13:10] <tomp2> easy with foot long level and 5t shim
[03:13:27] <jmkasunich> actually I'd probably go high class, I have gage blocks
[03:13:37] <jmkasunich> 0.1000 under one end, 0.1005 under the other
[03:14:28] <jmkasunich> cradek: you need one for the lathe
[03:14:35] <cradek> nope
[03:14:43] <jmkasunich> to make sure the bed isn't twisted
[03:14:50] <cradek> this lathe does not need leveling
[03:14:58] <jmkasunich> all lathes need leveling
[03:15:08] <cradek> nope, the massive casting is mounted at three points, even the manual says don't sweat it.
[03:15:14] <jmkasunich> ah, nice
[03:15:21] <cradek> it says just put it on a reasonably strong floor
[03:15:45] <cradek> one foot adjusts so it doesn't rock - that's all you have to do
[03:15:58] <jmkasunich> wait - three feet = no rocking
[03:16:23] <jmkasunich> why do you need to adjust?
[03:16:31] <cradek> the lathe to the cabinet - three feet; cabinet to the floor - 4 feet
[03:16:36] <jmkasunich> ah, ok
[03:16:50] <jmkasunich> I wish more machines had three point mounts
[03:17:04] <jmkasunich> my grinder would be a perfect candidate for that
[03:17:19] <cradek> I'm amazed at this ongoing thread of people saying they wish emc had soft limits
[03:17:35] <jmkasunich> yeah
[03:17:39] <jmkasunich> duh, it does
[03:18:26] <tomp2> start another thread wishing emc had users who rtfm
[03:19:13] <cradek> heh, the hnc has one soft limit (as far as I can tell) - but the control keeps counting as you jog past it - you have to jog all the way back again to move
[03:19:49] <cradek> all the other directions it seems like you just run into the limits. maybe it's misadjusted though.
[03:20:39] <cradek> on the plus side, MDI G1 started working today for some reason
[03:23:57] <jmkasunich> reply posted
[03:24:12] <jmkasunich> hopefully not too rough on him
[03:28:34] <tomp2> any lists of tried&tested servo motors used with EMC2? i didnt find any off the shelf ac/dc on wiki http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl/emcinfo.pl?EMC2_Supported_Hardware
[03:28:53] <jmkasunich> motors don't care what software is driving them
[03:29:58] <tomp2> amps drive motors, we tell people to use stuff like Jon E's and Mesa. Where might a user get such motors? Anyone tried a Pansonic/Mitsubisihi/Baldor, what did they think of them
[03:30:29] <cradek> I disagree that you're out of luck without switches. soft limits are still very useful.
[03:34:01] <jmkasunich> only if you somehow connect them to a specific machine position
[03:34:50] <jmkasunich> I just measured the 2nd parallel for straightness - less than 0.0001 deflection over the entire 12"
[03:35:12] <jmkasunich> I'm impressed - the first one had 0.0002 of bend in it
[03:35:13] <cradek> yes, jog to one end of travel, or a mark or something, hit home
[03:35:25] <cradek> I did that with max forever (still do for Z)
[03:35:48] <jmkasunich> you can add a comment about "pseudo-homing" to gain the benefits of soft limits without switches
[03:48:53] <tomp2> who made this emc video? http://video.google.com/videoplay?docid=3321458111477478272
[03:49:27] <jmkasunich> anonimasu maybe?
[03:49:45] <toastydeath> on many commericial machines, the hard limits kill power to the servos and the restart is complicated
[03:49:49] <toastydeath> soft limits are a+
[03:50:06] <tomp2> could be, custom python monitors, thx
[05:09:44] <fenn> that video was awallin
[06:29:45] <SWPadnos__> SWPadnos__ is now known as SWPadnos
[06:41:33] <anonimasu> hmm
[06:42:20] <anonimasu> jmkasunich: awallin made it im the other anders :)
[14:00:08] <tom2> anonimasu: thx, i found it http://www.anderswallin.net/2007/11/spinning-the-dc-servos/
[14:17:15] <cradek_> cradek_ is now known as cradek
[14:31:21] <BigJohnT> my new butterfly http://imagebin.ca/view/fDxGa0.html
[14:36:36] <cradek> that's neat
[14:37:04] <cradek> are the antennae part of it, or separate pieces?
[14:37:33] <tom2> nice, even nice shadows. waterjet?torch?laser?
[14:38:05] <cradek> BigJohnT: what was the url for the video of your machine? a guy here is interested.
[14:40:41] <cradek> forget it, he has to go do his job :-)
[14:43:59] <SWPadnos> heh: http://imagebin.ca/view/58PH_j.html
[14:48:55] <BigJohnT> cradek: the antennae and legs are coat hanger welded on
[14:50:11] <BigJohnT> tom2 laser
[14:50:16] <BigJohnT> no just kidding
[14:50:19] <BigJohnT> plasma
[14:51:01] <BigJohnT> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Videos#Plasma_cutting
[15:26:32] <fragalot> http://upload.wikimedia.org/wikipedia/en/1/18/FortranCodingForm.png who feels like programming fortran for IBM?
[15:26:50] <SWPadnos> not me, not me!
[15:28:04] <tom2> just made it desktop wallpaper
[15:28:10] <fragalot> tom2: rofl
[15:30:38] <archivist> I have a deck of cards in the loft from an IBM 1136
[15:30:54] <archivist> may have fortran
[15:38:37] <tom2> the aptos project uses some auto f2c
[16:52:35] <fragalot> whoah steppers are hard to turn if the leads are shorted
[16:54:29] <fragalot> lol now my fingers hurt from trying
[17:03:14] <jepler> fragalot: yeah, that's a good way to determine which leads are on the same winding, too.
[17:03:30] <anonimasu> :)
[17:07:03] <Roguish> jepler: gotta question on enables.
[17:07:40] <Roguish> i have a Z axis with NO brake. any type of fault, even a simple following error, disables the amps and the z axis falls. not good.
[17:09:57] <owad> in the x axis test, in the stepper mill config, should my limit switches be able to stop the motion, while I'm holding down the jog button? (they don't)
[17:10:00] <anonimasu> can you counterbalance your Z?
[17:10:17] <SWPadnos> Roguish, that is a hardware problem
[17:10:33] <anonimasu> Roguish: Just curious.. that's a really bad setup(dangerous)
[17:10:47] <SWPadnos> the big red button should remove power from the machine, regardless of whether EMC is even running (or whether the PC is on)
[17:11:02] <SWPadnos> in that case, the Z axis should stop, period
[17:11:20] <anonimasu> * anonimasu nods
[17:12:59] <Roguish> i got the estop ok. i just concerned that during this initial period that if i do get a following error the axis does not fall
[17:13:17] <SWPadnos> if the PC is off, does the Z asix fall?
[17:13:20] <SWPadnos> axis
[17:13:37] <anonimasu> it shouldnt fall ever no matter what really..
[17:14:03] <Roguish> in core-servo the amp-enable is tied to the axis enables. is it possible to disconnect this? any other repercussions?
[17:14:07] <SWPadnos> that's my point :)
[17:14:18] <Roguish> i will be adding a break in a while.
[17:14:32] <lerneaen_hydra> jmkasunich; nice blog post about the scraping
[17:14:44] <lerneaen_hydra> sounds like one of those menial tasks you tend to dread ;)
[17:15:39] <anonimasu> lerneaen_hydra: what url?
[17:15:59] <Roguish> i can disconnect the physical amp enable, but the dac-enable concerns me 'cause it shuts down. no dac signal and the axis falls.
[17:16:02] <lerneaen_hydra> http://jmkasunich.com/cgi-bin/blosxom
[17:16:41] <anonimasu> nice :)
[17:17:18] <jepler> Roguish: you can hook anything you like to your amplifier's enable input, but if you don't tie axis.0.amp-enable-out to them then you won't get emc's usual behavior to disable the amps in any state but MACHINE ON. you have to decide for yourself whether this has safety reprocussions in your machine.
[17:17:35] <lerneaen_hydra> anonimasu; yeah, too bad actually doing it isn't nearly as nice ;)
[17:18:09] <jepler> "repercussions"
[17:21:42] <Roguish> i understand this. i guess i will open up the z axis following error limit, and hope i don't get any other faults that trip the 'enables'.
[17:22:20] <Roguish> like I said, i will be installing a break in a while, i just don't know when. i have brought it up with the client as a safety issue.
[17:22:32] <SWPadnos> so - how do you deal with the falling Z during estop?
[17:22:56] <Roguish> i don't, it falls. such is the 'safety issue'.
[17:23:00] <SWPadnos> ah ;)
[17:23:24] <anonimasu> uh..
[17:23:33] <anonimasu> Roguish: better deal with it fast.. before it happens
[17:24:05] <anonimasu> Roguish: or get a paper saying it's not your fault.
[17:24:12] <BigJohnT> Otis solved that problem a long time ago
[17:24:21] <anonimasu> Otis?
[17:24:22] <anonimasu> hehe..
[17:24:24] <anonimasu> how
[17:24:26] <anonimasu> :)
[17:25:02] <BigJohnT> If the elevator dropped the dogs kicked in and locked the elevator to the shaft :)
[17:25:41] <anonimasu> * anonimasu nods
[17:25:44] <anonimasu> I've seen that before
[17:26:13] <Roguish> this has always been the action, unfortunately. there are several other safety issues. the spindle drive discoonect is the breaker across the building and around the corner. and others.
[17:26:42] <anonimasu> wire it all through estop.
[17:27:10] <anonimasu> that sounds like a machine you might loose a arm/leg/head to at random point in time..
[17:27:20] <BigJohnT> by code the disconnect must be in sight of the motor...
[17:27:27] <anonimasu> or get impaled with a endmill/drill when the axis falls out of control with the spindle on
[17:27:32] <Roguish> anyway, thanks for the advice. gotta shut down for a bit and install the front of the cabinet. ttfn.
[17:27:44] <anonimasu> -_-
[17:28:09] <anonimasu> well, as long as I dont have to run it..
[17:33:06] <anonimasu> *yawns*
[17:40:29] <owad> in the x axis test, in the stepper mill config, can anybody tell me if the limit switch should be able to stop motion? Just want to confirm the correct behavior before I do more testing.
[17:40:48] <owad> (stop motion generated by clicking 'jog')
[17:41:55] <h2i> oi fenn
[17:42:21] <fenn> why do you have two nicks?
[17:46:20] <h2i> oh sorry
[17:46:37] <h2i> because konversation freenode doesn´t allow me to be in enough channels with one
[17:46:45] <h2i> -konversation
[17:46:51] <h2i> * h2i didn´t sleep enough last night
[17:47:10] <fenn> too much IRC :)
[17:47:28] <h2i> heh, can´t get enough of it, for sure :)
[17:47:58] <BigJohnT> owad: does the axis limit popup show up when you cycle the switch?
[17:49:24] <owad> no -- I've never even seen such a popup
[17:50:32] <owad> I have both limit and home on the same pin. Is it ok to wire them such that they're floating when open, and 5v when cosed?
[17:50:59] <BigJohnT> then your limit switch is not connected somewhere either in EMC or electrically
[17:51:12] <owad> thanks
[17:51:19] <BigJohnT> normally limit switches are closed for ok and open when tripped
[17:51:48] <BigJohnT> did you do a stepconf wizard to generate your config
[17:51:53] <owad> yes
[17:51:59] <owad> I'm in the middle of that config right now
[17:52:03] <owad> testing the x axis
[17:52:38] <BigJohnT> when testing in stepconf AFAIK the limit switches are not in play
[17:53:05] <owad> I was hoping that might be the case! :)
[17:53:20] <owad> so if I open up EMC with this config and press the switch, it'll pop up a dialog?
[17:54:33] <BigJohnT> yes it will say something like Axis 1 limit switch
[17:55:57] <owad> there's an arror pointing to a line (as it to indicate a limit) beside the X axis readout. When I push the switch, the arrow goes away? Does that mean I have it wired backwards?
[17:57:13] <BigJohnT> possibly, I'm not near a Linux machine to see perhaps someone else can verify
[17:57:40] <BigJohnT> * BigJohnT looks in the docs
[17:58:53] <BigJohnT> does it look like an arrow with a vertical line?
[18:00:28] <owad> yes
[18:00:45] <tom2> brakes ( clutches ) that the motor shaft go thru are pretty cheap. Bendix makes some. When powered, they release, So I have one on Z that is in series with hardware Estop.
[18:00:56] <BigJohnT> then that is the limit switch and I was not correct about the limit in stepconf
[18:01:18] <owad> I'm seeing that icon in the actual program -- not in stepconf
[18:01:38] <owad> so if I see that icon when the switch is not depressed, it means I have it backwards, right?
[18:01:42] <BigJohnT> ok, then reverse the switch to be N/C
[18:01:51] <BigJohnT> yes
[18:02:22] <BigJohnT> you should get a popup too
[18:03:19] <owad> no popup
[18:03:39] <owad> everything is 'stopped' though, might that make the difference?
[18:04:01] <BigJohnT> yes, you have to be in run mode to get the popup
[18:04:25] <owad> then it looks like it's wired up correctly. Thanks!
[18:05:27] <tom2> if the popup can occur in any state, then it is easier to check. may be safer than testing in run mode too.
[18:19:25] <SWPadnos> you can see whether any axis is on a limit by looking at the icon on the DRO, which I'd say is easier than dealing with popups
[18:23:48] <BigJohnT> anything is easier than dealing with a limit popup :)
[18:31:11] <Unit41> shalabahama
[18:45:08] <Roguish> hey all. quick question. how do i get emc to recognize a different file extension as a gcode file? example: .nc
[18:50:51] <BigJohnT> hmmm, I did that once
[18:51:27] <BigJohnT> look in the [DISPLAY] or [FILTER] section of the manual
[18:51:32] <Roguish> is it in FILTER? or something like that?
[18:52:06] <BigJohnT> yea, I had to do it so it would open up .NGC and .ngc files
[18:54:58] <fragalot> Note to self: do not put stepper motor leads in mouth to hold while turning the stepper
[18:56:03] <Roguish> a shocking truth
[18:56:25] <fragalot> Aye
[18:57:20] <Roguish> BigJohnt: yeah, the FILTER did the trick. thanks.
[18:59:48] <BigJohnT> cool
[19:07:51] <skunkworks_> what is stuarts site with pictures?
[19:21:41] <fenn> skunkworks_: mpm1.com:8080
[19:23:36] <pmbdk_> pmbdk_ is now known as pmbdk
[19:29:35] <skunkworks_> fenn: thanls
[19:29:37] <skunkworks_> thanks
[19:36:44] <robin_sz> is this thing on?
[19:37:20] <skunkworks_> Robin!!
[19:37:28] <robin_sz> where?
[19:37:32] <robin_sz> * robin_sz looks around
[19:37:46] <robin_sz> hows tricks?
[19:38:14] <skunkworks_> still have all my fingers..
[19:38:25] <robin_sz> wow,
[19:38:38] <skunkworks_> I set the bar pretty low
[19:38:40] <robin_sz> so the anti-leprosy drugs really do work then?
[19:39:35] <skunkworks_> crap - I didn't know I was supposed to bring my 'A' game today
[19:40:19] <robin_sz> funny how i keep coming back here :)
[19:40:56] <robin_sz> suddenly got a burning (hah, burning geddit?) desire to build a CNC tube cutter
[19:40:59] <robin_sz> plasma
[19:41:04] <robin_sz> thing :)
[19:41:43] <robin_sz> seems the only real way to mitre cut pipes
[19:46:53] <fenn> how many axes?
[19:47:10] <SWPadnos> 19.5
[19:47:37] <robin_sz> ummm .. .im thinking 3 ... X .. A and sub x
[19:47:51] <SWPadnos> how long are the pipes?
[19:47:55] <robin_sz> 6m
[19:48:01] <SWPadnos> hm
[19:48:21] <robin_sz> up to 12" / 315 mm OD
[19:48:36] <robin_sz> im thinking X for moving the chuck along the bed
[19:48:43] <robin_sz> A for rotating it
[19:48:59] <fenn> wouldn't it be simpler to move the plasma head?
[19:49:02] <robin_sz> and sub x, for moving the torch +- 300mm in X
[19:49:12] <robin_sz> yep, thats sub X
[19:49:39] <fenn> but if you were moving the chuck you'd have cantilever force on the bearings from the pipe's weight
[19:50:22] <robin_sz> these things usually look like a long bed, with a travelling chuck that supports and turns the back end of the pipe
[19:50:35] <fenn> um, i guess i dont see the point to two X axes
[19:50:38] <robin_sz> and a second fixed chuck up the front ens
[19:50:40] <robin_sz> end
[19:50:56] <robin_sz> im just looking how the commercial macchines work
[19:51:04] <robin_sz> a big X for bulk movement
[19:51:25] <skunkworks_> what about torch hight?
[19:51:36] <robin_sz> and a small x with the torch mounted that does the sine motion as the tube rotates to produce the bevel cut
[19:51:54] <robin_sz> just rollers resting on the tube will be fine for height
[19:51:55] <SWPadnos> ok - now you're making sense :)
[19:52:38] <robin_sz> id rather not bother, but getting 12" tube mitre sawn is HARD
[19:53:05] <SWPadnos> rotate tube for A, pivot torch for B/C (whatever you want to call it), and move X for length
[19:53:15] <SWPadnos> then you still need Z height
[19:53:27] <robin_sz> nah, just use rollers resting on tube
[19:53:56] <SWPadnos> and it could be good to have a secondary Z so you can lower the tube into a water bath - that could be used to allow you to cut only one side of the tube (if that's ever necessary)
[19:54:25] <robin_sz> I was thinking of just a big fan sucking the crap out of the end of the tube
[19:55:08] <SWPadnos> it seems to be that you'd scar the inside of the opposite side of the tube once the plasma pierced through
[19:55:13] <SWPadnos> s/be/me/
[19:55:16] <robin_sz> 12" tube?
[19:55:29] <fenn> is this pretty much what you're thinking? http://news.thomasnet.com/images/large/017/17407.jpg
[19:56:21] <robin_sz> pretty similar
[19:56:37] <robin_sz> I was thinking of a secondary fixed chuck ..
[19:57:00] <robin_sz> like that, but a fixed secondar support before the torchg
[19:57:12] <robin_sz> all cutting takes place to the righ tof the secondary support
[19:57:27] <robin_sz> then it can happily cop off 1.2m lengths and have em roll away ...
[19:57:35] <robin_sz> advance 1.2m
[19:57:37] <robin_sz> cu thte next
[19:57:58] <robin_sz> anyway
[19:58:24] <robin_sz> easy enough .. been forced into it really by the lack of people around here who can motre cut 12" pipe
[20:00:01] <robin_sz> mitre even
[20:01:00] <robin_sz> http://www.ronmack.com.au/MachineryDetails/tabid/92/ProductID/180/Default.aspx
[20:01:05] <robin_sz> more like that I guess
[20:02:05] <SWPadnos> that is a big-ass chuck
[20:02:26] <robin_sz> yeah, looks about 24"
[20:02:32] <robin_sz> bigger than I need for sure
[20:03:25] <tom1> i could see portable would be useful on construction sites
[20:03:31] <robin_sz> mmmm
[20:04:05] <robin_sz> unlikely, most of this sort of stuff is fabricated in specialist plants and delivered to site ready to rock
[20:04:28] <tom1> as opposed to delivering the program ;)
[20:05:14] <robin_sz> its fairly heavy fabrication, you dotn weld this sort of stuff on site
[20:05:29] <robin_sz> anyway
[20:05:39] <robin_sz> i think EMC is the tool for this :)
[20:07:44] <robin_sz> so long as it can manage coordinated X and A moves, its a cinch
[20:14:58] <tom1> robin_sz: sound like neat application, i thought it was for box tube. emc could handle that too but i imagine more axis are involved.
[20:16:24] <robin_sz> yeah , I wrote all the C for doing box, with 4 axes
[20:16:37] <robin_sz> never really tried it though
[20:20:05] <robin_sz> http://www.blmgroup.com/img_prod/prodotti/lasertube/LT722D/video.wmv
[20:20:14] <robin_sz> 4 axis laser box
[20:21:55] <robin_sz> http://www.blmgroup.com/img_prod/prodotti/lasertube/jumbo/video.wmv
[20:22:03] <robin_sz> ^^^ sexy!
[20:22:15] <robin_sz> that is awesome
[20:24:11] <fenn> is that movie 1:1 speed?
[20:24:17] <robin_sz> yeah
[20:24:20] <robin_sz> thick wall tube
[20:24:38] <robin_sz> the ist one is 1:1 as well
[20:24:47] <robin_sz> lasers are quick :)
[20:25:36] <fenn> in the first one everything falls too fast and the sparks don't look right (in addition to being wicked fast)
[20:25:46] <robin_sz> nah, its 1:1
[20:25:57] <robin_sz> 1.5mm wall I would say
[20:26:07] <robin_sz> so .. 5m to 10m a minute?
[20:26:59] <robin_sz> a modern 5kw would do twice that in flat sheet
[20:27:10] <robin_sz> 20m a minute is possible
[20:48:19] <dmess> Hi al
[21:02:53] <skunkworks_> well - I think the current sense logic will work. :)
[21:03:04] <skunkworks_> now on to making the pcb
[21:03:27] <cradek> yay
[21:06:25] <cradek> skunkworks_: what will you sell them for?
[21:06:30] <skunkworks_> the ouput of the flipflop goes low (enable for the bridge driver) when the current treshold is tripped and stays low until the current goes down and there is a raising edge of the pwm input
[21:07:05] <skunkworks_> cradek: What kind of liabillity is involved with that? ;)
[21:07:06] <robin_sz> what was that popular encoder in / DC out servo board for EMC?
[21:07:15] <skunkworks_> I suppose I could sell a 'kit'
[21:07:44] <cradek> skunkworks_: that might be cool
[21:10:13] <robin_sz> the mesa card is still hte Way To Go right?
[21:10:18] <skunkworks_> robin_sz: mesa or pico
[21:10:45] <robin_sz> pico is // port, right?
[21:11:14] <skunkworks_> yes
[21:11:19] <skunkworks_> mesa is pci
[21:11:34] <robin_sz> yeah,mesa is cheaper I htink
[21:12:05] <jepler> http://mesanet.com/ 5i20 PCI card + 7i33 quad analog servo interface +7i37 isolated I/O card(s)
[21:12:07] <cradek> pico sells amps and the whole shebang
[21:13:12] <cradek> pico is pretty tempting for my lathe if I can't get the existing Z setup to work right
[21:13:44] <jepler> huh, is this a new product? 7i29 dual 2KW h-bridge
[21:15:15] <robin_sz> so 199 + 69 + 69 .. $340 USD roughly
[21:15:27] <robin_sz> thats .. what in GBP?
[21:15:33] <robin_sz> £21
[21:21:46] <robin_sz> hmm ..lets see if they can give me a shipping price to the UK
[21:23:59] <robin_sz> so just grab ubuntu Hardy Heron, add a line or two to apt/sources and apt-get emc2?
[21:29:33] <robin_sz> ok, I found steve hardys install widget
[21:29:35] <robin_sz> neato
[21:30:00] <robin_sz> * robin_sz wonders if that will work on debian testing ...
[21:43:35] <dmess> motors and stuff showed up FEDEX at 5:30...hee haww
[21:44:39] <dmess> packed within an inch of its life and a customs invoive under 1/2 what i paid... ;)
[21:44:47] <dmess> invoice
[21:45:36] <dmess> 6 dollars for my USE nema 23 motors... they are brand new in the box
[21:45:57] <anonimasu> too small for me ~_~
[21:46:11] <anonimasu> nema 23 moves my table but it wont cut metal nicely
[21:46:34] <dmess> i only have a SMALL tathe to control
[21:49:01] <dmess> the whole system with 2 X 2 contactor relay boards... 3 motors 3 axis board power supply and cable 200 bucks canadian... delivered in 5 days... from mexico to canada thru the US
[21:59:46] <fenn> dmess where from?
[22:19:46] <dmess> Fenn Mexico
[22:20:14] <dmess> am i F#cked??
[22:21:04] <dmess> hardware looks decent so far.. I havent hooked anything up yet... im not configered yet
[22:23:45] <dmess> i need mounts and couplers still
[22:31:16] <tomp> northern mexico? ;) (shades of coneheads 'we are from france' )
[23:08:57] <robin_sz> anonimasu, dude!
[23:09:48] <robin_sz> all your servomotor are belong to us
[23:10:25] <toastydeath> make your time you have to chance to survive