Resetting Rotary Axis to Zero

Yes, this does seem to be the standard answer. Although it strikes me as being too similar to the Y2K fiasco, and not at all an elegant solution. It is, however, a workable solution and the one I've settled on so as not to be sidetracked by something that isn't an immediate problem.

I haven't tried this yet but I assume it will work and be of great benefit to my particular situation. My question is why/how does it work? I've looked the DOCs and googled it but its still as clear as mud to me.

So I tried it in a sub-routine at the end of a sub-path and it works! It seems to mathematically take away all full 360 degree rotations and leaves the remainder, a big help. I like to get back to zero so I can visually make sure nothing wonky happened since I don't fully trust my mechanics, so I just add "G0 A0" to the sub-routine and it essentially homes. Fantastic! and Thanks!

Badger wrote: I haven't tried this yet but I assume it will work and be of great benefit to my particular situation. My question is why/how does it work? I've looked the DOCs and googled it but its still as clear as mud to me.

The key sections are:
linuxcnc.org/docs/2.7/html/gcode/g-code.html#gcode:g10-l20
linuxcnc.org/docs/2.7/html/gcode/overvie...:numbered-parameters
linuxcnc.org/docs/2.7/html/gcode/overvie...ode:binary-operators (though that does rather assume that you already know what the modulus operator does)

MaHa wrote: I use this to prevent unwind A-axis:

G10 L20 P#5220 A[#5423 MOD 360]

This is excellent. Thank you. For fusion users, just add -
/* Set to A0 and prevent unnecessary unwind */
writeBlock(
gMotionModal.format(0),
conditional(abcFormat.format(abc.x) == 0, "G10 L20 P#5220 A[#5423 MOD 360]")
);

Cheers

Where do I put
writeBlock(
gMotionModal.format(0),
conditional(abcFormat.format(abc.x) == 0, "G10 L20 P#5220 A[#5423 MOD 360]")
);


I can't find anywhere in the post that this will work

I would suggest searching the post for where it writes the "M2" and put it before that.