#linuxcnc-devel | Logs for 2012-08-18

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[05:39:27] <CIA-28> 03cmorley 07v2.5_branch * rad23881c1317 10/src/emc/usr_intf/pncconf/pncconf.py: pncconf -fix PID's feedback-deriv signal
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[19:19:15] <bpuk-home> http://www.bpuk.org/linuxcnc/g71_first_moves.png
[19:19:23] <bpuk-home> now to get arcs working with it ;)
[19:20:16] <micges> nice
[19:23:13] <cradek> awwwwesome
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[19:25:38] <bpuk-home> I'm not quite sure where execution should carry on after the G71 command though - as it is it runs the next line... which is a rapid
[19:28:12] <bpuk-home> micges: thanks again for the help with logDebug, sped things up a bit :P I probably should figure out how to use gdb too
[19:28:42] <micges> welcome
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[19:38:44] <bpuk-home> ugh, I'll need to convert both radius and centre format arcs. rats
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[22:13:04] <joe9> this appears to be a linuxcnc bug. but, I am not sure.
[22:13:08] <joe9> program : http://codepad.org/rhZmOU23
[22:13:29] <joe9> line 133 G00 Z0.200 ( retract )
[22:14:09] <joe9> when i have that line uncommented, when I try to run the program, it gives me a message stating "Program exceeds machine minimum on axis Z"
[22:14:31] <joe9> this is the relevant portion of the .ini file for axis Z: http://codepad.org/10ZNXUf3
[22:14:53] <joe9> as you notice, the limits are 1 to -5.50
[22:15:22] <joe9> the gcode sets the g55 touch off, based on a probe switch.
[22:15:45] <cradek> since that move is the result of probes, it is impossible to test the program beforehand for limit violations
[22:16:06] <joe9> It appears that linuxcnc is not able to calculate the Z values reliably when the G10 L2 P2 happens within the program.
[22:16:07] <cradek> ... unfortunately. but that's why there's a "run anyway" button
[22:17:06] <cradek> no, it's the probing that makes this impossible
[22:17:07] <joe9> cradek, yes, there is. but, I do not want to miss out any real errors that it might catch. the message has saved me a few times.
[22:17:33] <joe9> cradek: my only option is to separate the probing to a different program, correct?
[22:17:41] <cradek> it's impossible for it to predict the future (the results of the probe)
[22:17:42] <joe9> or, live with the message and Run anyway.
[22:20:56] <joe9> cradek, is there some kind of initialization or program separation I can do between the probing portion and the subsequent program?
[22:21:05] <joe9> so that I can avoid that message?
[22:21:08] <joe9> does that make sense?
[22:21:19] <joe9> i can physically separate the gcode to 2 programs
[22:21:27] <joe9> and use the 1st to touchoff g55
[22:21:30] <cradek> well you can't make the message correct IF your offsets depend on the probe.
[22:21:31] <joe9> and then run the 2nd.
[22:21:51] <cradek> it's possible that you might be able to avoid the message, giving the same behavior as "run anyway"
[22:22:17] <cradek> I think in preview/checking it makes some assumption about the probe result - perhaps it assumes it runs to completion, or gets all zeroes for the result, I don't recall
[22:22:19] <joe9> the offsets that depend on the probe will be in the 2nd program.
[22:23:07] <joe9> the only reason I have them both in the same program is to avoid the scenario where someone mistakenly runs the 2nd program without touching-off g55.
[22:23:08] <cradek> I am not sure what you can do about it (except run anyway), you might have to experiment
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[22:27:24] <joe9> cradek, instead of changing the Z of G55, Can I use the tool length offset?
[22:27:34] <cradek> yes definitely
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[22:36:02] <joe9> cradek: this is interesting. I added a M06 after the G10 L2 P2 and no message now.
[22:36:02] <joe9> cradek: would you expect that?
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[23:42:28] <bpuk> http://www.bpuk.org/linuxcnc/g71_first_arcs.png
[23:42:44] <bpuk> refactor and bughunt tomorrow I think
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[23:59:24] <skunkworks__> bpuk: Yay!