#emc | Logs for 2011-04-07

[00:00:01] <Guest425> yes, it isn't a cnc application but a g-code controller would be ideal. It's a quick experimental proposal.
[00:00:46] <elmo40> and you have two par ports? doesn't hurt to burn the liveCD and try it out ;)
[00:01:29] <elmo40> how do you currently run both of them at the same time with one computer?
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[00:02:59] <Guest425> I have a live cd and have some knowledge of EMC2 and gcode, but no time/budget to waist if it can't. I thought I'd ask the experts 1st.
[00:04:06] <Guest425> It's a reasearch proposal, implementaion has not yet began.
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[00:05:35] <SWPadnos> I think the existing limit is 4 or 8 parports, but that's easily increased by changing a #define in the hal_parport driver
[00:06:05] <Guest425> so stepgen can run multiple
[00:06:10] <SWPadnos> or less easily changed by making the number unlimited (or more accurately, limited by available memory/CPU cycles)
[00:06:23] <SWPadnos> yes, you can load 100 stepgens if you like, and they don't have to connect to parallel port
[00:06:25] <SWPadnos> s
[00:06:32] <SWPadnos> they may, but it isn't required
[00:07:15] <SWPadnos> it is best to use as few ports as possible though, since each parallel port takes a certain amount of time to read and write, and this is done in the fastest thread
[00:07:35] <Guest425> so I can use stepconf to configure the 1st pport then modify the hal and ini files to add the 2nd and rest of the signals
[00:07:46] <SWPadnos> the "certain amount of time" is something like 2 or 3 microseconds per port, since there are 3 I/O locations to read/write
[00:08:04] <SWPadnos> yes, there's also another configuration creator called
[00:08:12] <SWPadnos> "pncconf", which can do multiple ports
[00:08:22] <Guest425> is it on the live cd?
[00:08:23] <SWPadnos> up to 3 at least (I'm not sure)
[00:08:26] <SWPadnos> I'm not sure :)
[00:09:30] <SWPadnos> I think it is in 2.4 actually, it's just not on the menu I guess
[00:10:07] <SWPadnos> I don't know which features the version on the CD (if there is one) has - it's had a lot of features added since 2.4 was branched
[00:10:44] <Guest425> Thanks aSWPadnos you've been a BIG help. That's why I came here 1st...:-) a few minutes of questions is better than days going down a path that will be fruitless.....
[00:10:55] <SWPadnos> heh
[00:11:03] <SWPadnos> or at least you'll choose a different fruitless path ;)
[00:12:18] <Guest425> could be..... but the task at hand will be easier generating and running Gcode than trying to do all the motion control from scratch. The experiment is Linux based so it's a natural
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[00:13:18] <Guest425> thanks again, probably have more questions months down the road.
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[00:17:37] <aggrav8d> http://imgur.com/a/OWW2p#iglfV
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[00:36:09] <aggrav8d> MARCO!
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[00:55:15] <bzzzz> polo
[00:55:49] <bzzzz> aggrav8d: curious, which stepper drivers are those?
[00:56:15] <aggrav8d> uh... good question?
[00:57:08] <bzzzz> doh
[00:57:18] <bzzzz> those aren't stepper drivers are they?
[00:57:31] <bzzzz> sorry, they just looked really familiar to something isaw on ebay
[00:57:54] <aggrav8d> they should be.
[00:58:00] <bzzzz> huh?
[00:58:06] <aggrav8d> they should be stepper drivers.
[00:58:14] <bzzzz> aha!
[00:58:20] <bzzzz> are those 4.2A peak drivers?
[00:58:30] <aggrav8d> one is 6a peak, the others are 3a
[00:58:36] <bzzzz> sweet
[00:58:51] <bzzzz> how've they been holding up, if you don't mind my asking?
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[01:00:22] * ries curious to know what drivers
[01:01:39] <aggrav8d> i've only run the machine maybe 2 hours cutting time, 10h running time. still trying to calibrate the machine and get it to do what i tell it do.
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[01:03:38] <bzzzz> aggrav8d: cool, best of luck then
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[03:00:02] <unaHm> has anyone had any success with heekscad in linux? i'm using ubuntu 10.10 amd64, and haven't been able to get it to compile so far - are there any known deb files out there of the latest version?
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[03:04:27] <unaHm> failing that, are there any other toolpath optimsation programs in linux that generate good g-code for emc2?
[03:05:05] <jdhNC> generate g-code from what?
[03:12:43] <elmo40> from drawings?
[03:14:01] <jdhNC> dxf2gcode?
[03:15:01] <toastydeath> unaHm, my understanding of the state of open source gcode generators is that they are more for engraving and traces on pcbs
[03:15:24] <elmo40> except for the gcode plugin for Inkscape.
[03:15:36] <elmo40> you can do areas
[03:15:41] <elmo40> not only tracing
[03:16:04] <elmo40> as for heeks... I don't know of anyone being able to get it compiled on a 64-bit system.
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[03:44:49] <unaHm> ok, thanks again elmo40!
[03:44:51] <unaHm> o
[03:44:53] <unaHm> oosp
[03:44:55] <unaHm> oops
[03:45:05] <elmo40> ;)
[03:45:56] <unaHm> i've created 3d stl files of guitar body shapes, and i was looking for a program to create more 'efficient' g-code that would trace the outline of the shapes, rather than constantly scanning rows
[03:46:02] <unaHm> (if that makes any sense)
[03:46:18] <elmo40> ya, I hear ya.
[03:46:22] <elmo40> heeks can do that
[03:46:38] <elmo40> to a certain degree...
[03:46:52] <unaHm> for now, would it be preferable to use heeks in windows?
[03:48:46] <unaHm> i'm familiar with inkscape, and was tempted to try the g-code plugin...especially if it uses layers to 'create' a 3d object
[03:49:56] <unaHm> sorry for the repetition elmo40, i wanted to include this info for toastydeath's benefit :)
[03:50:21] <toastydeath> unaHm, how simple is the shape
[03:50:25] <MattyMatt> is it a curved top guitar?
[03:50:34] <toastydeath> oh, guitar body
[03:50:36] <toastydeath> not simple
[03:50:44] <MattyMatt> a flattop would be
[03:51:02] <MattyMatt> for a flattop I'd go the inkscape route for now
[03:51:20] <toastydeath> is the open source APT project still around
[03:51:31] <unaHm> it has some contoured areas, but mostly it's flat
[03:52:28] <toastydeath> my stock response to this question is frowned on so I won't give it, but I am unaware of any actual CAM software that does what you want in the open source world
[03:52:45] <unaHm> ah, ok
[03:52:57] <MattyMatt> anything that does contours at the moment will decompose curves into short straight moves. I guess ideally you want sth that keeps it all as beziers and uses G2.1 and G3.1
[03:53:08] <toastydeath> MattyMatt, negatory
[03:53:27] <toastydeath> almost all cam software breaks toolpaths down to the minimum machine resolution g1 moves
[03:53:49] <MattyMatt> that's what I said
[03:53:59] <toastydeath> no no, i mean that's optimal
[03:54:00] <toastydeath> sorry
[03:54:06] <toastydeath> g2/g3 turns out to not be good
[03:54:21] <MattyMatt> they work much better for me
[03:54:42] <MattyMatt> I rewrite most of my curvy gcode now, just for the smooth curves
[03:54:49] <MattyMatt> smoother and faster
[03:54:55] <toastydeath> ah, in emc?
[03:55:03] <MattyMatt> yep
[03:55:12] <toastydeath> most controls have real look ahead and compile the curve before they execute it
[03:55:12] <MattyMatt> that's the channel we's in :)
[03:55:31] <unaHm> i don't have a cnc machine yet, but i've been reading about the different modes that emc can use to run a machine - exact stop, continuous and so on. i think that, for me, i would use it in a continuous mode given the shape style
[03:55:33] <toastydeath> so that they can run very fast and smooth
[03:55:54] <unaHm> sounds good!
[03:56:26] <MattyMatt> ah, I didn't realise there were modes. I read that exact stop was what emc always did
[03:56:32] <toastydeath> unaHm, 99% of machining takes place with continuous
[03:56:38] <unaHm> ok
[03:56:53] <unaHm> unless it's specified, yes?
[03:57:04] <toastydeath> i'm not sure what emc does, you'll have to check the manual
[03:57:46] <unaHm> sounds like the perfect thing to waste time at work with! :)
[03:57:46] <MattyMatt> the gcode is a damn site easier to read and edit when you use g2/3 :) that's my remaining argument
[03:57:55] <unaHm> :)
[03:57:59] <SWPadnos> emc has all three modes, in addition to a continuous mode with user-specified tolerance
[03:58:32] <SWPadnos> however, EMC doesn't do look-ahead that will coalesce a bunch of small lines into an arc move
[03:58:43] <SWPadnos> (at least, I don't think it does)
[03:58:51] <toastydeath> it doesn't, i've asked cradek before
[03:58:53] <SWPadnos> it does have "stupid CAM detection" for lines though
[03:59:22] <unaHm> ok
[03:59:30] <SWPadnos> it will collapse many collinear line segments into a single move, as long as the error from doing so is within the set tolerance
[03:59:45] <MattyMatt> I've been told skeinforge has curve detection
[03:59:46] <SWPadnos> (ie, not quite collinear may still be combined)
[04:00:10] <MattyMatt> it's a bit pointless when the repraps don't have g2/3, but it's there apparently :)
[04:00:13] <SWPadnos> things like cutter compensation work much better when you don't have a billion tiny lines as well
[04:00:40] <unaHm> i did try to use skeinforge, but again had problems with the scripts. i guess i should focus some time on that software as it's possibly the most feasible at the moment
[04:00:45] <SWPadnos> night
[04:00:49] <toastydeath> what other controls do is look at the line, and calculate an acceleration profile
[04:00:56] <toastydeath> real expensive controls do it for jerk
[04:01:09] <MattyMatt> gn SWPadnos
[04:01:16] <unaHm> +1
[04:03:06] <MattyMatt> unaHm are you gonna print the guitars or mill them?
[04:03:40] <unaHm> the intent was to use a gantry router (or similar) to mill the wood
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[04:04:05] <MattyMatt> I don't think skeinforge does subtractive, but I may be wrong
[04:05:24] <MattyMatt> my mill turned out just too small for guitar bodies :(
[04:05:40] <unaHm> aww :/
[04:05:43] <MattyMatt> 3/4 size OK, but not a full stratocaster
[04:06:15] <MattyMatt> actually I could be wrong. 16" * 13.5" at the last measure
[04:06:28] <unaHm> yes, i'm still looking into a system that'll be feasible in terms of cutting size, and acceptable within the home
[04:06:33] <unaHm> hmm, you may have luck there
[04:06:53] <unaHm> i keep thinking about the blacktoe 2'x4' table
[04:08:35] <unaHm> this is pretty much what started me thinking about using CNC: http://www.youtube.com/watch?v=tu1q4WzoQlE
[04:09:52] <MattyMatt> here's mine http://img697.imageshack.us/img697/5959/p1010043j.jpg
[04:11:07] <MattyMatt> wow, that room was messy, but so clean in the days before sawdust :)
[04:11:24] <unaHm> lol
[04:11:26] <unaHm> nice machine!
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[04:12:40] <MattyMatt> I'm about to start upgrading it. it has never been stiff enough for more than gentle woodwork
[04:13:02] <unaHm> i've made a couple of bass guitars for myself by hand, and while it's therapeutic, i tend to end up with an instrument i'm not entirely happy with, as my lack of patience means i take liberty on certain things
[04:13:24] <unaHm> for some reason, i have much more focus with the design of a 3d model
[04:13:32] <unaHm> ah
[04:14:33] <unaHm> well, it's time for me to hit the sack - thanks for the insight so far, and i'm sure i'll be back for more soon!
[04:14:49] <unaHm> goodnight everyone
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[04:15:11] <MattyMatt> I guess it's pretty hard to justify the time that goes into most instruments. you see really nice ones in the pawn shop cheaper than the materials
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[10:04:39] <elmo40> unaHm_: man that is slow machining
[10:11:58] <Jymmm> I think they slowed it down on the fine work to have no tooling marks.
[10:13:26] <elmo40> it is wood... that is why they invented sandpaper
[10:13:30] <Jymmm> It's muh faster on the hogging out portion
[10:14:44] <Jymmm> Yeah right, I see you've never tried removing tooling marks.
[10:21:26] <elmo40> I've been machining for over 15 years. I began in the clean-up department... I know what it takes to remove tool marks. You should see what they guys can do in my current location. Hack-job programmers over speed and over feed to please management (lower cycle times per part = more money, didn't you know) and they leave huge waves and chatter marks. If that can be removed then a little bit of feed from a ballnose on wood
[10:23:22] <Jymmm> Or just prevent it all together
[10:25:17] <Jymmm> wood isn't like metals, it has a grain, porus, etc, it's a PITA to remove tool marks, especial in certain species of woods with high pitch content
[10:26:06] <Jymmm> If you had mars in brass, shit just hit it on the buffer. can't do that with wood.
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[11:29:58] <sumpfralle> @unaHm: maybe take a look at PyCAM (http://pycam.sf.net) - it generates toolpaths (GCode) for 2D and 3D models.
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[12:54:57] <skunkworks> neat! http://www.youtube.com/watch?v=QGyxnafLbcw
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[13:23:12] <jthornton> that's what I need to make with all those linear rails I have... just need a rotary axis
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[13:25:46] <SWPadnos> use a rack and pinion for the rotary axis
[13:26:07] <SWPadnos> (hold the spindle still and move the rack on a linear slide ;) )
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[13:32:25] <ries> skunkworks: very nice indeed
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[14:47:07] <Jymmm> another big earthqauke 7.4 just hit japan
[14:48:07] <Jymmm> tsunami warning out too
[14:48:45] <mikeggg> oh no
[14:49:11] <mikeggg> they can't get a break it seems
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[14:50:20] <Guest85744> re
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[14:50:33] <Jymmm> mikeggg: My gf JSUT said the same thing.
[14:56:03] <mikeggg> well, I suppose it's better to get hit again now rather than a year later or something
[14:56:46] <Jymmm> True, unless it destroys the reactors more
[14:57:08] <jdhNC> or destroys more reactors
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[15:17:24] <aggrav8d> http://imgur.com/a/OWW2p#iglfV
[15:17:50] <aggrav8d> 7.4 is half as bad as 8.9
[15:18:22] <aggrav8d> and they get tsunami warnings all the time. that's why so many people got hurt/went missing - they just ignored it again.
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[15:24:49] <bzzzz> zomg
[15:25:00] <bzzzz> is that cnc made of...wood?!
[15:25:04] <aggrav8d> yes.
[15:25:16] <bzzzz> i gotta ask why
[15:25:33] <bzzzz> oh i see, you're prototyping your own cnc
[15:25:49] <Connor> Mine is made from MDF.
[15:25:52] <bzzzz> how big are those steppers, 4A?
[15:27:11] <aggrav8d> 6a in the center (for x travel) and 3a elsewhere.
[15:27:30] <aggrav8d> bzzz - no, i didn't do my homework and thought this was all I could afford.
[15:27:35] <bzzzz> "See that? What is that? Like, 1mm off? F U, CNC!" haha
[15:27:56] <bzzzz> aggrav8d: looks good anyway
[15:27:58] <aggrav8d> i'm trying to get it to work right and having a devil of a time.
[15:28:13] <bzzzz> what problems are you running into?
[15:28:17] <bzzzz> (curious)
[15:29:45] <aggrav8d> it's not following instructions. I cut simple patterns and the lines are all f'd up.
[15:30:11] <bzzzz> hm, maybe use the hal scope to make sure the pulses are coming out right, then check pos_scale?
[15:30:11] <jdhNC> but it works correcly with a sharpie instead of a router?
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[15:30:15] <Connor> Got a picture of it ?
[15:31:41] <aggrav8d> jd - i can try to sharpie something. give me 20 minutes to find a sharpie...
[15:32:12] <jdhNC> make sure the sharpie stays rigid whatever is holding it
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[15:33:23] <jdhNC> I made a thing out of a piece of CPVC with a cap on the end, drilled out. The pen sticks out the drilled cap, spring on the top side.
[15:35:28] <jdhNC> if it draws well, the steppers/control/etc aren't the problem
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[15:52:14] <aggrav8d> jdhNC - it drew well even when the machine had a lot of play and wasn't fully assembled. drawing well doesn't tell me much.
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[15:54:33] <archivist> aggrav8d, can you hear the steppers lose steps (sound rough)
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[15:58:54] <aggrav8d> nope, they sound very smooth and musical.
[15:58:56] <aggrav8d> one thing i notice, when they stop moving their idle noise isn't always the same.
[16:00:47] <archivist> thats ok as the idle current whistle depends on coils energised
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[16:01:52] <archivist> mine are silent when stopped, but thats a function of the driver chopping frequency
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[16:28:04] <mikeggg> I wonder if you could mount one of these on like a CAT 40 tool holder
[16:28:05] <mikeggg> http://www.physikinstrumente.com/en/products/prdetail.php?sortnr=700880
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[16:29:00] <mikeggg> and then put one of these on the end for good measure
[16:29:00] <mikeggg> http://www.nsk-nakanishi.co.jp/industrial-eng/hpms/ispeed3/
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[16:40:50] <aggrav8d> try it and see.
[16:43:50] <mikeggg> my 2nd mortgage hasn't come through yet..
[16:45:08] <mikeggg> and I don't have anything that will hold a CAT 40..
[16:49:15] <aggrav8d> 2nd? ouch.
[16:49:23] <aggrav8d> i'm house poor but debt free.
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[16:52:02] <jdhNC> I think it tells you there is no problem with the code or the pulse train
[16:56:37] <aggrav8d> jdhNC - I think I need to take a walk to the store and get some more pens to try drawing again.
[16:57:06] <aggrav8d> a lot has changed since I last tried drawing. still, nothing changes the fact that the machine didn't return to origin after drawing the test pattern.
[16:57:59] <jdhNC> a pen will probably give you the best results you can expect due to lack of loading.
[16:58:38] <jdhNC> but, if you can't go to the same spot twice (visibly) then the pen isn't needed yet :)
[16:58:40] <bill20r3> run the ssame 'draw' job several times, and you should be able to see where it wanders off track.
[16:58:53] <bill20r3> that may help you determine which axis it is.
[16:59:27] <aggrav8d> hmm... run the script several times... yeah, i can do that.
[16:59:40] <aggrav8d> bbiab.
[16:59:58] <IchGuckLive> jdhNC: witch cad you are using for the g-code generation
[17:00:23] <jdhNC> I use draftsight or autocad then cut2d
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[17:00:58] <IchGuckLive> ok thanks so the G-code is not the factor its the router itself ?
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[17:01:35] <jdhNC> err... my router works fine, for what it does.
[17:01:59] <IchGuckLive> ok thats nice
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[17:03:10] <jdhNC> I have a spare one if anyone is interested in a 12"x14" gantry router :)
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[17:36:15] <FinboySlick> Anyone here played with Syil machines?
[17:37:27] <FinboySlick> SWPadnos: Were the links of any use, btw?
[17:37:42] <SWPadnos> oh - yeah, I looked them over briefly
[17:37:54] <SWPadnos> I don't know that they would work as I need them to
[17:38:31] <SWPadnos> I think the only one that had a watchdog timer (to go back to crossover mode) was the PCIe card, which doesn't work in the tiny cases I have (and no PCIe slot either :) )
[17:38:49] <FinboySlick> I think the main thing is that you would have brief interruptions between 'live' and 'bypass' modes.
[17:39:23] <SWPadnos> yeah. in my experience, brief interruptions always happen in the 37 millisecond window where they cause the most damage :)
[17:40:24] <FinboySlick> SWPadnos: Indeed.
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[17:42:15] <FinboySlick> I'm so eager to get my thing going... I tought I could put it in a corner of a spare room I had in the house. Turns out it'll pretty much take the entire room.
[17:43:11] <IchGuckLive> FinboySlick: Thats what all of us end up at one time !!!
[17:43:33] <IchGuckLive> or eaven bigger going to the hole Garage
[17:44:11] <FinboySlick> IchGuckLive: Heh, yeah... It's not even a matter of 'maybe I went a bit overboard there' anymore. It's a definite assessment that yes, I did. But hey.
[17:44:31] <aggrav8d> http://imgur.com/hP2L8 total fail.
[17:44:56] <FinboySlick> aggrav8d: Your golden spiral isn't golden anymore!
[17:45:22] <IchGuckLive> aggrav8d: did you use G61 ?
[17:45:37] <IchGuckLive> i see alot of radius
[17:46:14] <IchGuckLive> this looks like a router testpattern
[17:46:50] <aggrav8d> this is a test pattern i made. it's got a golden spiral and some complicated font.
[17:47:07] <IchGuckLive> i see
[17:47:11] <aggrav8d> even given the long pen length and the way the paper wasn't perfectly held down, it's still miles off.
[17:47:32] <aggrav8d> it was travelling on the Y when it just froze. I think it's binding at one point on the gantry.
[17:47:42] <FinboySlick> aggrav8d: I wasn't following earlier. You think it's mechanical?
[17:47:50] <aggrav8d> (that's why the spiral is on top of the text. it wasn't supposed to be)
[17:47:56] <FinboySlick> (you prehempted me there)
[17:48:00] <IchGuckLive> mid down the radius to the round is this in the sketch or did the router do the tiny radius on its own
[17:48:21] <aggrav8d> FinboySlick - frankly, i don't know if it's mechanical.
[17:48:28] <aggrav8d> i didn't understand your last question.
[17:49:00] <IchGuckLive> aggrav8d: i guess you are not in exact path mode and you also lose it if you go start from Here !!
[17:49:35] <IchGuckLive> this is then the seen effect
[17:50:39] <aggrav8d> how would I check?
[17:50:52] <aggrav8d> i have no feedback.
[17:51:08] <jdhNC> is your PS sufficiently sized?
[17:51:21] <IchGuckLive> use G61 at the first line and at all Restart points beond M00
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[17:51:37] <aggrav8d> yeah, we covered taht one a couple of days ago.
[17:54:43] <aggrav8d> i don't appear to have any M00 in the code.
[17:55:37] <IchGuckLive> NP
[17:56:25] <IchGuckLive> are you using the Start from Here in the G-code workaround M01
[18:00:00] <IchGuckLive> late here need to go BY !
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[18:00:34] <jdhNC> out of curiosity, could someone explain to me what he means?
[18:06:19] <FinboySlick> Sorry. Still at the below-noob level here.
[18:12:39] <archivist> jdhNC, sometimes I dont think we can work that out
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[18:17:33] <aggrav8d> ugh. cutviewer does not like g61.
[18:18:33] <aggrav8d> I have no idea what he meant.
[18:23:35] <archivist> I dont think he has watched your problems enough
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[18:26:45] <archivist> you have item to item errors that can come from missing steps, looseness in drive train not systematic errors that G61 exact path mode are for
[18:27:36] <archivist> eg gears slipping on stepper shaft
[18:28:32] <archivist> aggrav8d, add load to gantry see if anything slips when a move is commanded
[18:30:00] <jdhNC> did you exercise the axes in stepconf when setting max speed/accel?
[18:31:28] <archivist> and after finding max accel and speed reduce some to allow for cutting load and machine friction
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[18:32:21] <archivist> I did some of that with the table loaded http://www.archivist.info/cnc/stagethree/P1260004.JPG, even then I later had to lower the numbers
[18:32:51] <archivist> and had slipping drives
[18:32:56] <cpresser> is it possible to call a subroutine using "O</path/to/file.ngc> call"?
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[18:40:05] <mhaberler> in MDI: yes, but only failry recent versins
[18:40:40] <aggrav8d> archivist - how should I add load?
[18:40:55] <aggrav8d> jd - yes, but I could do it again.
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[18:41:51] <aggrav8d> archivist - uh... i don't know what I'm looking at in that picture. I just see a crazy workshop.
[18:42:35] <archivist> aggrav8d, not so easy with yours, options are you leaning on it while jogging it, the table is under all the blocks as weights
[18:43:07] <aggrav8d> is yours a machine where the table moves instead of the tool?
[18:43:35] <archivist> yes the stepper is cut off to the right
[18:43:51] <aggrav8d> mhm.
[18:44:51] <cpresser> mhaberler: so it would be possible via halui and mdi-command?
[18:45:09] <mhaberler> what do you want to do?
[18:45:25] <mhaberler> pin triggers oword subroutine?
[18:45:35] <cpresser> yes
[18:45:39] <cpresser> thats the basic idea
[18:46:27] <mhaberler> yes, should work - but unsure wether 2.4 cuts it.. there was a fix last fall and i dont know wether it was folded into 2.4
[18:46:34] <mhaberler> let me see
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[18:47:09] <aggrav8d> archivist - i'm a little apprehensive but I'll try your suggestion.
[18:47:30] <archivist> aggrav8d, more obvious here http://www.archivist.info/cnc/stagethree/P1260003.JPG
[18:48:25] <archivist> mine is a tiny machine, I was attempting to overload to see if it was ok
[18:48:54] <archivist> but things work loose as well later
[18:52:38] <archivist> aggrav8d, eg if you put a twisting force on the gantry to simulate a cutting force does it stiffen or drive slip etc
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[18:54:30] <slime2k> http://amalas.eu/~slime/PROJECTS/CNC/mdf/100_2648.JPG
[18:54:34] <slime2k> :D
[18:54:55] <bzzzz> another mdf cnc
[18:56:20] <slime2k> that was my first mill
[18:56:23] <slime2k> http://amalas.eu/~slime/PROJECTS/CNC/mdf_2/new_portal/IMG_1159.JPG
[18:56:26] <slime2k> V2.0
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[19:03:11] <aggrav8d> @#*$( that goddamn y-axis sprocket keeps coming loose.
[19:04:29] <aggrav8d> and another wire has just torn itself loose. this after i put in cable management to prevent such stupidity.
[19:04:33] <aggrav8d> grrr...
[19:06:30] <slime2k> and after one and a half year i build this
[19:06:32] <slime2k> http://amalas.eu/~slime/PROJECTS/CNC/big/P1010092.JPG
[19:07:18] <slime2k> :D
[19:07:32] <mikeggg> wow, cool
[19:08:01] <mikeggg> nice paint job
[19:09:45] <slime2k> should be neon yellow
[19:09:58] <slime2k> but i think it looks more like green
[19:10:09] <slime2k> http://amalas.eu/~slime/PROJECTS/CNC/big/gestell/
[19:12:01] <mikeggg> you did all the cutting and welding in that room
[19:12:03] <mikeggg> whew
[19:12:44] <slime2k> sure
[19:13:05] <slime2k> :D
[19:13:38] <aggrav8d> that's a very pretty machine.
[19:19:01] <FinboySlick> Ballscrews and all if my eyes serve me right.
[19:19:29] <slime2k> all?
[19:19:33] <archivist> I see you are finding something aggrav8d> @#*$( that goddamn y-axis sprocket keeps coming loose.
[19:20:07] <FinboySlick> slime2k: (and all that fancy stuff)
[19:21:23] <slime2k> :)
[19:21:38] <slime2k> yes, ballscrews
[19:21:43] <slime2k> 16x5 and 16x10
[19:21:57] <slime2k> and servos
[19:22:01] <FinboySlick> Double nut to prevent backlash?
[19:22:03] <slime2k> no more loosing steps
[19:22:12] <slime2k> :D
[19:22:37] <slime2k> hmm
[19:22:39] <FinboySlick> When I actually learn to use mine, I might switch it to servos too.
[19:22:57] <FinboySlick> Pretty pointless spending money on that for now though.
[19:24:06] <FinboySlick> Besides, the steppers are pretty beefy and it's a high-speed spindle so hopefully step-skipping won't be too common.
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[19:43:04] <aggrav8d> archivist - no, that's a new development.
[19:43:06] <aggrav8d> :P
[19:43:23] <aggrav8d> i'm wondering if the change in temperature in my garage is causing the set screws to come loose.
[19:44:09] <archivist> aggrav8d, set screws are a problem and a symptom of the errors you are getting
[19:44:55] <archivist> I mean a cause of your symptoms
[19:46:27] <aggrav8d> i can't seem to tighten them enough. I don't know if the hex inside the set screw is damaged or if my alan keys are not quite the right size. i know that if I turn to tighten the hex key slips. :P
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[19:47:51] <archivist> thats no good, replace with better screws and use good keys
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[19:57:23] <aggrav8d> no idea where to go in Vancouver to get better screws. sorry if that sounds lazy/stupid.
[19:58:36] <bill20r3> just uninformed. try the phone book.
[19:59:35] <archivist> or use a better coupler design some clamp instead
[19:59:56] <archivist> eg taper locking types
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[20:04:41] <FinboySlick> aggrav8d: Yes, set screws are pretty terrible for pretty much anything that has variable load: eg. stop/start a lot, changes in speed/direction, etc.
[20:05:16] <aggrav8d> well great, coz i got three of them in this machine.
[20:05:21] <aggrav8d> well, technically 6.
[20:05:59] <FinboySlick> aggrav8d: Motor couplings I assume?
[20:07:55] <aggrav8d> yeah.
[20:08:15] <FinboySlick> Do you have equal diameter on the shafts?
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[20:13:33] <FinboySlick> aggrav8d: You probably want something like what's at the bottom of this page: http://www.mcmaster.com/#shaft-couplings/=bry54e It's a good price/performance compromise for what I assume to be your application.
[20:13:55] <FinboySlick> If you've got something a bit bigger, you might look into spider couplings, but make sure the spider is pretty rigid.
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[20:17:48] <jdhNC> you coudl file flats on the shafts, but that seems to be frowned upon
[20:21:17] <FinboySlick> jdhNC: It only makes the setscrew situation happen a little bit later.
[20:21:53] <FinboySlick> jdhNC: One way to make set screws work better is to stack them.
[20:22:23] <FinboySlick> You use the first screw to tighten on the shaft, then you put another one on top to prevent the first screw from coming loose.
[20:24:01] <FinboySlick> But the rule of thumb usually is: Set screws are pretty much only good for hand tools.
[20:25:54] <jdhNC> I'm using lovejoy couplings with set screws, they have yet to be a problem
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[20:58:39] <cpresser> finished my custom DRO :) http://www.youtube.com/watch?v=JWEd8oMo-HA
[20:59:43] <Connor> your video is 90 degrees out...
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[21:01:10] <cradek> that's cool
[21:01:24] <cpresser> yes.. i didnt know how to rotate it :)
[21:01:47] <Connor> what did you video it with?
[21:01:52] <cradek> rotate head
[21:01:57] <cradek> wfm
[21:02:08] <andypugh> Did I miss a cool link?
[21:02:34] <cpresser> i created the video with my EOS digicam; i wanted it to be landscape-format
[21:02:49] <cpresser> andypugh: my new DRO http://www.youtube.com/watch?v=JWEd8oMo-HA
[21:03:13] <cpresser> i wanted to rotate it in software; but i could not figure how to do that with ffmpeg
[21:03:39] <andypugh> Probably from the command line
[21:03:45] <cradek> how does the dro work?
[21:04:20] <cpresser> it has a microcontroller to drive the LEDs via SPI
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[21:04:31] <cpresser> communication to the PC is done via USB
[21:04:46] <cradek> userland hal component?
[21:04:53] <cpresser> hal-integration is done with python in usersapce
[21:05:13] <cradek> perfect.
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[21:06:08] <cradek> well... perfect would have used nixies instead. but you are close.
[21:06:42] <andypugh> Laser projector?
[21:07:00] <cradek> lazzzor
[21:09:07] <andypugh> Does an installed system have an axis.py that can be edited, or is that only available in dev?
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[21:11:06] <JT-Shop> grumble... "how can I make the arrow keys make the table go the wrong way?"
[21:11:19] <cradek> you could edit /usr/bin/axis but it's a poor idea because an update will nuke your changes. better to repackage.
[21:11:25] <andypugh> I was going to suggest editing axis.py
[21:12:05] <andypugh> I think he could do it with the lathe option in the ini
[21:12:08] <cradek> better yet if you can change what you want in .axisrc somehow
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[21:29:05] <KimK> JT-Shop: An easier (and better!) way would be to tell yourself, "I'm not moving the table, I'm moving the tool. I'm not moving the table, I'm moving the tool." Also known as the Magnum PI method: "Don't look at the table, look at the tool. Don't look at the table, look at the tool."
[21:29:53] <andypugh> JT is happy with the Right Way. This is a user on the forums.
[21:30:01] <KimK> Ah, OK.
[21:30:25] <DaViruz> a friend of mine has a big heidenhein controlled mill where X+ actually is the table moving to the right
[21:30:44] <KimK> Exactly.
[21:30:59] <KimK> Wait, what?
[21:31:09] <DaViruz> yeah, its backwards
[21:31:21] <DaViruz> i usually start by issuing the mirror X command
[21:31:33] <DaViruz> but the jog buttons still move it the "wrong" way
[21:34:18] <KimK> OK, that would be strange. Good luck with that.
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[21:35:15] <KimK> Does Heidenhain have parameters to flip X and Y?
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[21:37:10] <DaViruz> dunno
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[21:52:21] <bzzzz> the earth isn't moving, the sun is.
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[21:54:11] <DaViruz> it's all relative
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[22:00:46] <MOGLI> anyone using MOCCA GUI???
[22:01:31] <bzzzz> sounds muslim
[22:02:19] <MOGLI> no mecca is muslim MOCCA is GERMAN i think ;)
[22:02:32] <MOGLI> bzzzz are you from Indian sub continent???
[22:02:42] <bzzzz> only when i'm asleep
[22:03:04] <MOGLI> means??
[22:03:14] <bzzzz> no
[22:03:45] <MOGLI> any MOCCA users???
[22:08:51] <andypugh> There must be some, but I don't recall seeing any on the IRC.
[22:09:01] <andypugh> You could try the forum, or the mailing list.
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[22:09:21] <MOGLI> actually i want to know is it still active or not??
[22:09:35] <MOGLI> because i dint find lathe specific support in it..
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[22:11:23] <andypugh> Last mention of lathe was http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/id,3496/catid,41/limit,6/limitstart,6/lang,en/#3588
[22:11:44] <andypugh> If you ask on the forum, Thomas is active there.
[22:12:39] <JT-Shop> KimK: that's what I tried to tell him :)
[22:14:35] <andypugh> Hmm, actually, gtom hasn;t been seen on the forum for 4 months. Following his forum profile link he seems to be more interested in ladies bottoms than Mocca at the moment.
[22:14:53] <JT-Shop> lol
[22:16:06] <MOGLI> :)
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[22:31:37] <JT-Shop> cradek: I got distracted by a visitor earlier and didn't get a chance to finish typing my grumble
[22:37:07] <aggrav8d> sigh
[22:37:34] <aggrav8d> it's always the f'n sprockets coming loose. those gosh darn set screws won't stay done up.
[22:39:42] <JT-Shop> aggrav8d: what kind of tip and how are they arraigned on the sprocket?
[22:44:06] <Valen> loctite
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[22:46:22] <JT-Shop> just depends on what the actual problem is...
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[22:47:47] <elmo40> great... now making your own things at home is going to cost you
[22:47:48] <elmo40> http://arst.ch/ov4
[22:49:05] <KimK> JT-Shop: I should have known it wouldn't be you having that problem. Thanks for your patience. (With him *and* with me, lol!)
[22:50:56] <JT-Shop> LOL, I got distracted and didn't have time to type the next line before 20 helpful suggestions popped up
[22:51:25] <elmo40> isn't that the best part? multiple minds just gearing away ;)
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[23:30:30] <andypugh> aggrav8d: Setscrews are a horrible way to secure anything to anything. I will use anything else given half a chance.
[23:32:16] <andypugh> The absolute best way I have found to hold sprockets on shafts are these things: http://www.fptgroup.com/fenner.asp?title=&pageid=2669
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[23:33:19] <andypugh> We had them on our RobotWars robot and I think we were the only team never to have a problem with out motor sprockets (12mm shaft, 800W motor, nasty duty cycle)
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[23:34:37] <andypugh> Night all
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[23:35:21] <JT-Shop> good night Andy
[23:35:57] <JT-Shop> yep, use them a lot awesome holding power
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[23:52:22] <aggrav8d> JT-Shop - i don't quite get how they stay fastened when twisted.
[23:54:13] <JT-Shop> they are wedge shaped... any way how many set screws and what is the arraignment?
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[23:54:45] <aggrav8d> 2, 90 degrees apart, on each sprocket.
[23:56:46] <JT-Shop> that is the best possible way... flats on the shaft?