G76 with exit taper

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14 Feb 2018 12:51 #105913 by pkasy
G76 with exit taper was created by pkasy
Hi everyone!
Who can show a photograph of the correctly executed cycle G76 with a exit taper?
On all my machines the cutter pauses and appropriately cuts the groove before exit taper. How to change this?
spindle_at_speed looks like stable.

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15 Feb 2018 05:24 #105970 by pkasy
Replied by pkasy on topic G76 with exit taper
ok, where to get course?

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15 Feb 2018 15:57 #105981 by Todd Zuercher
Replied by Todd Zuercher on topic G76 with exit taper
How are you trying to do it now?
I don't have a Lathe, and have never programmed any threading, but according to the manual the exit taper is programed with the E word in the G76 line.
linuxcnc.org/docs/2.6/html/gcode/gcode.h...G76-Threading-Canned
This example is in the manual and should produce a 45 degree exit taper.
G0 Z-0.5 X0.2
G76 P0.05 Z-1 I-.075 J0.008 K0.045 Q29.5 L2 E0.045

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15 Feb 2018 16:47 #105985 by pkasy
Replied by pkasy on topic G76 with exit taper
thank you.
but you don't have a lathe and you don't have a list of problems of axis for lathe.

of course, i know manuals. and my question is "why G76 makes GROOVE before exit taper?", not "how to use G76?".

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18 Feb 2018 16:18 #106137 by skunkworks
Replied by skunkworks on topic G76 with exit taper
I just played with sim - it seems to blend between the threading and exit move. can you post your ini and gcode?

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16 Apr 2018 09:10 #109116 by verticalperformance
Is it the same issue as forum.linuxcnc.org/20-g-code/29685-g76-p...aper-linux-cnc-2-7-0 ? If so, try an F0 prior to the G76 and see if that helps. I think the bug in the new motion planner introdced in 2.7.0 may still be there.

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