#emc | Logs for 2010-10-04

[00:04:22] <theorb> theorb is now known as theorbtwo
[00:17:21] <ichudov> pix of my mill with 4th axis (servo rotary table) attached: http://igor.chudov.com/projects/Bridgeport-Series-II-Interact-2-CNC-Mill/30-October/
[00:58:34] <atmega> cambam almost does what I want, but it messes up one of the lines
[01:06:44] <mikeplus32> mikeplus32 is now known as mikeplus64
[01:32:48] <elmo42> atmega: what do you need to do? the whole thing? drill holes? would be SO simple to just write the code by hand :P
[01:37:32] <Jymmm> ichudov: You need to reduce the size of the photos you are posting. Your website is slow to load
[01:42:33] <atmega> elmo: yeah, I can write it by hand for this... I was just hoping that something this simple would be easy with some sort of CAM package
[01:54:45] <howard> Hi Guy's, This is my first time on the channel. Looking for a little assistance?
[01:57:06] <Jymmm> howard: Hello, to get help you actually have to ask a question and provide details. If someone can answer they will.
[02:30:55] <ries_> ries_ is now known as ries
[03:57:44] <cradek> ichudov: I like your splash guard. Did you make it?
[04:16:01] <skunkworks> cradek: did you get a chance to work on your 4th axis?
[04:16:21] <cradek> yes I made half of the mount tonight, in only two tries
[04:16:39] <cradek> I made it mirror image the first time - duh - but I was able to save it
[04:16:48] <skunkworks> heh - been there...
[04:16:58] <cradek> so stupid
[04:17:13] <cradek> I was concentrating on getting the holes in the right (very weird) places
[04:17:25] <cradek> I never thought that they should be on the flip side...
[04:17:48] <cradek> but anyway it's going well, I'm probably 75% done
[04:17:53] <skunkworks> nice
[04:18:04] <skunkworks> I think dad got the encoder for y hooked in
[04:18:10] <cradek> cool
[04:21:50] <cradek> wonder which of us will have it working first...
[04:22:08] <cradek> I have a bunch of wiring stuff to do - I want plugs that make it detachable somehow
[04:22:18] <skunkworks> I hope to have the y axis running tomorrow night.
[04:23:07] <skunkworks> neat - have a plug in mind?
[04:23:10] <Jymmm> cradek: plugs?
[04:23:25] <cradek> I have some cabling and plugs that came on the indexer
[04:23:58] <Jymmm> and you want to replace them?
[04:24:18] <cradek> no, I probably want to reuse them
[04:24:36] <Jymmm> # of conductors?
[04:25:17] <cradek> one resolver (6 plus shield?) and one dc servo with tach (4)
[04:25:44] <Jymmm> I like DIN plugs
[04:26:13] <Jymmm> come in panle mount, inline, twist lock etc
[04:27:01] <Jymmm> like this
[04:27:03] <Jymmm> http://www.parts-express.com/pe/showdetl.cfm?partnumber=090-542&source=googleps
[04:27:11] <Jymmm> come in up to like 10 pin too
[04:28:17] <cradek> I haven't seen a liquid-tite version of that
[04:28:28] <Jymmm> is that needed?
[04:28:38] <cradek> yep probably
[04:28:56] <cradek> I'm making the rest of the setup coolant proof (or at least trying my best)
[04:29:10] <Jymmm> gotcha, I think there is another
[04:33:57] <Jymmm> cradek: Eh... http://www.ia.omron.com/product/family/1827/index_l_u.html
[04:58:43] <elmo42> atmega: how thick is that part? 1/4" 1/2" I can draw it up for you and make a tool path... give you the steps that I did to make it. what tools will you use?
[13:22:07] <ichudov> cradek: Yes, I made that splash guard myself. Thanks
[13:26:05] <ichudov> Jymmm: I reduced picture size in half. I agree, they were too big.
[13:41:13] <cradek> ichudov: neat, I like it
[14:07:03] <SWPadnos> cradek, are you using a 7i49 on your HNC?
[14:07:29] <cradek> nope, it's 5i20 7i33 7i37 7i37
[14:07:45] <SWPadnos> ah, ok. you replaced the resolvers then?
[14:07:53] <cradek> no, I used convertors
[14:07:53] <SWPadnos> (or are you using Jon's board?)
[14:07:58] <SWPadnos> or something else :)
[14:08:01] <cradek> I don't think 7i49 is supported yet?
[14:08:06] <cradek> yes jon e's
[14:08:09] <cradek> they work great
[14:08:15] <SWPadnos> oh. then maybe I should get one and make it so :)
[14:08:27] <SWPadnos> (some time in February maybe)
[14:08:46] <cradek> 7i48 works in gitmaster now - not sure how much harder 7i49 is
[14:09:14] <cradek> "simple matter of programming"
[14:09:16] <SWPadnos> is that the one with multiplexed encoders?
[14:09:20] <cradek> yes
[14:09:37] <SWPadnos> ok. I was wondering how all those pins would make it into one connector
[14:21:08] <skunkworks> forgot to show this http://www.electronicsam.com/images/KandT/conversion/yaxis/flexplate.jpg
[14:21:25] <skunkworks> that is the flex plate for http://www.electronicsam.com/images/KandT/conversion/yaxis/adaptfinal1.JPG
[14:21:31] <skunkworks> (made 2 for good measure)
[14:24:12] <cradek> cool
[14:24:18] <cradek> any particular reason for using saw blade?
[14:31:34] <skunkworks> manly it is the right steel to flex (springy)
[14:31:48] <skunkworks> and we had it ;)
[14:32:49] <skunkworks> bbl
[15:30:05] <Jymmm> ichudov: =)
[16:41:47] <cpresser> today I milled gold :) http://ca.rstenpresser.de/~cpresser/tmp/pictures/gooold.jpg
[16:44:51] <cpresser> those are specimen for adhesive tests
[16:46:33] <cpresser> they are approx 5x4x4mm.. pure .999 gold. :)
[16:58:34] <Jymmm> ...and they started as 1lb bars, now only 1/4 ounce precision machined washers
[16:59:16] <Jymmm> cpresser: How much loss are you premitted?
[17:00:24] <cpresser> none :)
[17:00:51] <cpresser> I build that white-pastic case to collect the chips
[17:01:16] <Jymmm> sure, but there is always gong to be some loss
[17:01:19] <cpresser> i just milled the surface. not the whole body
[17:01:20] <Jymmm> going
[17:02:20] <cpresser> yes, there may be some. however, all chips together were 0.3gramms. so even with 50% loss, this would only be 10Euros
[17:02:51] <cpresser> material and assembly of one specimen was around 400€
[17:03:32] <cpresser> so the chip loss is mostly insignificant
[17:05:57] <elmo42> insignificant? that is 2.5% loss per job. if you did this once, no problem, but many times then there would be an issue.
[17:06:25] <cpresser> I did only those two. and there will be no more
[17:07:13] <cpresser> and since it is intended for scientific purposes, 2.5% would not be a problem.
[17:08:22] <cpresser> on top of that, 50% is the worst-case-guess. most likely I just wasted gold for 1-2€
[17:18:26] <Jymmm> cpresser: So did you get to keep the swarf?
[17:18:51] <cpresser> no. its all property of the university of kaiserslautern :/
[17:19:24] <Jymmm> and what are they going to do with a bag of gold dust?
[17:20:47] <cpresser> sell it together with specimen, once they have been probed
[17:21:46] <cpresser> thats my guess.. ill ask :)
[17:38:11] <Paragon39> Hello All, Could someone please take a look at the following post as I am pulling my hair out with this issue ;-( Where should I be concentrating my efforts at the firmware Verilog area or the EMC driver? Any sugestions very much appreciated! http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/catid,38/id,4483/lang,english/
[19:34:39] <wendtmk> Afternoon all.
[19:37:48] <wendtmk> Beuller... ;-)
[20:00:24] <wendtmk> Howdy all
[20:05:46] <Paragon39> What is the fuction of a .comp file in EMC?
[20:06:39] <SWPadnos> it's source code which is preprocessed with the "comp" tool, and then compiled with gcc
[20:08:36] <Paragon39> Thanks SWPadnos
[20:08:46] <SWPadnos> sure
[20:11:44] <wendtmk> Hi Steve
[20:11:52] <SWPadnos> hi Mark
[20:12:27] <wendtmk> Got a strange probem on my Z axis. Seems to be "gaining" steps over the run of the X axis when running G code
[20:13:59] <wendtmk> It's dead on at the first G Code Z dimension, but after a 32" X axis run, it's cutting .020" deeper than it should. And it's repeatable.
[20:15:42] <wendtmk> It slowly ramps up to the .020" deeper cut from the first spot on measurement
[20:15:58] <SWPadnos> steppers or servos?
[20:16:03] <wendtmk> Steppers
[20:16:24] <SWPadnos> ok, then it sounds like there may be some crosstalk on the step lines for Z and X
[20:16:40] <SWPadnos> does it happen with the spindle stopped as well (cutting air)?
[20:17:24] <wendtmk> I don't know. At this point I have no real accurate way of measuring except for the finished strip.
[20:17:48] <wendtmk> That's kinda due to the design of the machine.
[20:17:53] <SWPadnos> hmmm. yeah, it could be hard on your machine ;)
[20:17:55] <archivist_attic> get a dti to calibrate/test the machine
[20:18:30] <SWPadnos> I think this is the funky dual-slitting-saw machine for cutting bamboo strips
[20:18:36] <wendtmk> I really don't have a way to mount a DTI since I have two saw blades that come together at a point. I have a dti, just not much of a way to mount it.
[20:19:40] <wendtmk> When you say crosstalk, are you talking about signal leakage between the X and Z axis wires from the control box to the steppers?
[20:19:51] <SWPadnos> yeah, something like that
[20:19:56] <SWPadnos> or from the saw motor(s)
[20:20:17] <wendtmk> If it was from the saw motors, wouldn't it affect both axes?
[20:20:39] <wendtmk> They're DC motors, BTW.
[20:20:47] <SWPadnos> another possibility is that the Z driver isn't holding position well, like if it was going to reduced-current mode (since you don't step as often on Z)
[20:20:49] <SWPadnos> ah, ok
[20:21:02] <SWPadnos> it might or might not affect both motors
[20:21:10] <SWPadnos> that was a SWAG, incidentally. :)
[20:21:20] <wendtmk> ROFL! Gotcha...
[20:23:18] <wendtmk> I've checked and double checked the settings in the ini file, and have played around with different max_velocity, max_acceleration and stepgen_maxaccel, but that didn't seem to do much of anything other than really slow down the Z axis. It's doesn't seem to be stalling or resonating a the settings I currently have in the ini file.
[20:23:45] <SWPadnos> no, I don't imagine it's a problem coming from the computer
[20:23:57] <SWPadnos> with steppers, what you see on the screen is what the PC output
[20:24:03] <SWPadnos> but not necessarily what the motors did ...
[20:24:33] <wendtmk> Yeah, that's true, and according to the Axis outputs, it says its on the dimensions. Not that it would lie to itself...
[20:24:45] <SWPadnos> no. PCs don't do that too often
[20:25:01] <wendtmk> Only when you're doing statistics... ;-)
[20:25:09] <SWPadnos> LILO
[20:25:13] <SWPadnos> (lies in,lies out)
[20:25:21] <wendtmk> Ayup.
[20:25:57] <wendtmk> So should I try to physically isolate the Z axis wiring from the X axis wiring? Right now they're all in a cable chain.
[20:26:14] <archivist_attic> set the gcode to be parallel and see if the stionary stepper moves
[20:26:36] <SWPadnos> well, one thing to try would be to short out the Z step input at the drive - disconnect the wires entirely
[20:27:02] <SWPadnos> see if it moves at all
[20:27:06] <wendtmk> The steppers all move, and all move in the correct direction, and the X axis is moving the correct amount. The Z axis just seems to "gain" steps over the course of time.
[20:27:23] <SWPadnos> if it doesn't, then reattach the step wires, but short them at the PC end (disconnected from the PC)
[20:28:11] <wendtmk> Okay, I'll disconnect the Z axis from the control box. How would I disconnect them at the PC? The control box is hooked to the PC by a parallel cable.
[20:28:12] <SWPadnos> or try a medium-value resistor, like a 470-ohm, across at the PC end (still disconnected from the PC)
[20:28:19] <SWPadnos> no idea
[20:28:29] <SWPadnos> that's left as an exercise for the user
[20:28:31] <wendtmk> Ha, that's a big help... ;-)
[20:28:47] <SWPadnos> what's in the control box?
[20:29:10] <SWPadnos> the Z step wire(s) need to be disconnected from the controller, not the controller from the PC
[20:29:49] <wendtmk> The drivers, the power supply, and the speed controllers for the DC motors.
[20:30:04] <wendtmk> As well as an opto-isolated BOB
[20:30:19] <SWPadnos> ah, so you should be able to disconnect the driver from the BOB
[20:31:15] <wendtmk> Yes, I could. I'm going to try disconnecting the Z axis stepper from the control box first. I'll get back with the results.
[20:31:26] <SWPadnos> I'm just suggesting relatively standard troubleshooting procedure: there's a problem somewhere in the PC -> driver -> motor -> mechanics on Z. Isolate the pieces and see where it starts/stops working
[20:31:42] <SWPadnos> well, you want the motor attached to the driver
[20:31:48] <SWPadnos> else it won't have any holding torque
[20:32:53] <wendtmk> So, I should start by disconnecting it from the BOB? The Z axis uses a modified ACME screw so it won't drop like a ball screw would without power.
[20:33:41] <SWPadnos> actually, that's something to check. if the Z motor is disconnected from the driver and it *doesn't* move, then that eliminates the mechanics from the equation (I think)
[20:34:29] <wendtmk> Ok, that's the simplest so I'll give that a whirl first. Uno momento...
[20:34:37] <SWPadnos> back to work for me. good luck with it
[20:35:48] <wendtmk> Ok, no movement of the Z axis with the stepper disconnected from the control box/driver.
[20:46:03] <wendtmk> And no movement of the Z axis with the driver disconnected from the BOB.
[23:17:58] <skunkworks> http://www.youtube.com/watch?v=pOHL_KlUdqw
[23:45:17] <Valen> sounds heavy
[23:45:48] <Valen> http://www.youtube.com/watch?v=G0yYdcqSpfM