#linuxcnc-devel | Logs for 2012-05-22

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[12:22:18] <jepler> oh boost python
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[12:54:29] <jepler> (I started working on making all the UPPER_CASE_CANON_CALLS into methods of a new object, but this is going to make the python canonmodule substantially different...)
[13:16:55] <JT-Shop-2> cool
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[13:22:16] <CIA-68> 03jthornton 07v2.5_branch * r7913b31d8e04 10/docs/src/gcode/gcode.txt: Docs: fix typo
[13:53:19] <jepler> it would have some minor advantages if I could succeed in doing it, but this wrinkle of canonmodule is making the difficulty vs pay-off ratio higher...
[13:53:44] <jepler> the advantages are mostly theoretical / stylistic, to be honest
[13:54:01] <jthornton> style is important too
[13:54:50] <jthornton> do you know of a quirk when threading with G76 and the number of passes is different if your using diameter mode or radius mode
[13:56:53] <jthornton> From Dewey "Note: in comparing results for G7 and G8 modes the number of passes can be made equal by setting j_for_G7 = 2 * j_for_G8 (this may be a bug in interp_convert.cc)"
[14:00:46] <skunkworks> jmk is still alive!
[14:01:28] <jthornton> I saw that
[14:02:28] <jepler> jthornton: I think I understand what the question is about, but I don't immediately know the answer.
[14:03:46] <jepler> basically, in diameter mode (G7) should I J K be interpreted as radii or diameters, and what is the current implementation doing..
[14:05:12] <skunkworks> I think that was something jmk implimented.. I don't know how far down the rabbit hole he went.
[14:05:49] <jthornton> I assumed that it was the same till Dewey said something about it
[14:05:51] <jepler> I would have said that G76 was a cradek
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[14:10:26] <jepler> My intuition says that all if I J K should either be radii or diameters according to G7/G8
[14:10:59] <jepler> err
[14:11:19] <jepler> that is to say, the rule for I should be the same as the rule for J and for K
[14:11:40] <jepler> but would anyone ever refer to the thread depth (K) as a diameter? I don't think that makes any sense
[14:14:04] <jthornton> that would be confusing to have I and K be either radii or diameters and even J for that matter
[14:14:30] <jthornton> J- - A positive value specifying the initial cut depth. The first threading cut will be J beyond the thread peak position.
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[14:16:27] <jepler> right now the code seems to be written so that IJK are all interpreted according to the G7/G8 setting
[14:17:28] <jthornton> interesting!
[14:17:40] <jepler> http://pastebin.com/quiYNSp5
[14:17:52] <jepler> so in this program the first and the second G76 are "the same"
[14:18:08] <jepler> I doubled x, i, j, k in the g7 section
[14:19:13] <jthornton> should we "fix" the manual?
[14:20:56] <jthornton> brb, someone is pulling up outside
[14:33:17] <jepler> Chris wrote this behavior deliberately in 2009, commit 7b1ac24 fix g8 / ... / g7 g76 i... j... k...
[14:33:36] <jepler> cradek, that is
[14:36:18] <jepler> actually, looking a bit further this was part of the original lathe code which apparently came from Les Newell (committed just a little bit before)
[14:36:33] <jepler> and chris found and fixed a bug where putting G7 or G8 on the *same* line with G76 had the wrong effect
[14:36:37] <jepler> wrt IJK
[14:37:13] <jepler> but G76 IJK have deliberately and always been in diameter mode ever since diameter mode was added in '09
[14:37:58] <jepler> so yes, at this point I think it's probably going to be better to make the docs explicit about this than potentially break 3 years of diameter-mode threading part programs
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[14:51:40] <jthornton> ok, thanks for looking into this
[14:51:48] <jthornton> I'll correct the manuals asap
[14:52:03] <jepler> thank *you*
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[15:17:25] <skunkworks> So - in rip - stepconf doesn't seem to run correctly. It skips from the first page to the last without going though pin or axis setup.
[15:19:25] <skunkworks> both 2.5 and a relatively recent head
[15:21:23] <jthornton> Yikes!
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[15:23:04] <skunkworks__> don't know if this is any use.. http://pastebin.com/9ZEximqR
[15:23:52] <skunkworks> this is rip remember - I am sure it works ok on installed..
[15:24:08] <skunkworks> (I would think others would be complaining.)
[15:24:37] <skunkworks> I was just going to walk through a stepconf session to become edumacated about it. ;)
[15:26:23] <jthornton> did you to . ./scripts/rip-environment before running it?
[15:26:36] <jthornton> s/to/do a
[15:27:19] <micges> here stepconf work fine in 2.5
[15:28:02] <micges> (2.5_branch, rip)
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[15:33:47] <CIA-68> 03jthornton 07v2.5_branch * rb80d39014cb4 10/docs/src/gcode/gcode.txt: Docs: add information to g76 about radius/diameter mode
[15:34:12] <skunkworks> jthornton: yes
[15:34:26] <skunkworks> Hmm - this is sim build..
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