#linuxcnc-devel | Logs for 2012-04-20

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[18:24:37] <cradek> http://timeguy.com/cradek-files/emc/arbarc.png
[18:24:42] <cradek> http://timeguy.com/cradek-files/emc/0001-arbitrary-arcs-helixes-proof-of-concept.patch
[18:44:55] <jepler> that's very interesting
[18:46:07] <jepler> I assume the preview's disabled for that screenshot
[18:46:22] <cradek> yeah I didn't do that part (it just draws a straight line from start to end)
[18:46:28] <jepler> oh I see that bit now
[18:46:45] <cradek> the motion is easy - the devil is in the details
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[18:48:07] <cradek> gcode syntax, error detection, offsets/rotation, preview, cutter comp, vel/acc constraints
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[18:58:52] <jepler> is this something you think you'd write in your own gcode?
[19:00:43] <cradek> only once in a blue moon
[19:02:47] <cradek> generated gcode from a very smart cam system making curvy things might want to use it. maybe.
[19:03:51] <jepler> I am wondering in my head if the biarc algorithm generalizes to the 3d case
[19:04:01] <jepler> it's not immediately clear to me whether the number of degrees of freedom is appropriate
[19:04:11] <cradek> yeah that's an interesting question
[19:05:10] <cradek> I can sure see wanting this on 5 axis parts
[19:05:25] <cradek> like thread milling a tilted hole
[19:05:40] <jepler> yes
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[19:45:53] <alex_joni> wouldn't it be easier to do arcs for UVW?
[19:46:18] <alex_joni> rotate/translate UVW like you want, then use G17/18 inside UVW and do the arcs there
[19:47:14] <cradek> that would also let you thread-mill a tilted hole, but is not as generic
[19:48:34] <alex_joni> right, but it could work on a robot
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