I think the chamfer in Mach is degreesThat is correct Hood ( G76 MACH 3 threading cycle it's the "L" value ).
The āLā retract or chamfer angle is in "angle of revolution".....or a "rotational angle".
and not an actually a chamfer. L90 would retract over 1/4 of a revolution, L360 would
be 1 rev, 720, two revs and so on. Don't think you will find that info in any of the code descriptions.
In the threading wizard the defined length "includes" the the distance of the L retract distance.
I don't know if the retract distance is included in G76, but you posted that it is not in reply #49.
Too busy / lazy to check it all out.
I have not used Fusion 360 for some time thus do not know what changes have been done.
I know that with the correct post processor it did generate correct G76 code for Mach3.
Just to avoid any confusion the above is for Mach# ver .062 and not using an external motion controller.
Most of the times for threading I use G32 output since one can monitor and pinpoint problems in
threading. The code is generated using wizards and they work great.
BTW,
How the end of the threading pass is done can vary depending on what is required as you said.
From an engineering point of view the end condition infuences a stress intensification factor which
could could reduce the loading of the thread. FWIW
RICH