Remap M6 in python
16 Apr 2025 05:36 - 16 Apr 2025 06:49 #326429
by Aciera
Replied by Aciera on topic Remap M6 in python
Python remaps are tricky to get right. I'm no expert but I have done a lot of trial and error during my work on Tilted Work Plane codes which uses a fairly complex python remap (although no M64, M65 usage).
github.com/LinuxCNC/linuxcnc/blob/master...ting/python/remap.py
On this background I would like to point out a few general things:
You might want to put something like this at the beginning of your remap so it does not execute on load:
Also note this restriction for the 'yield' feature:
linuxcnc.org/docs/html/remap/remap.html
which means that code like this is not allowed:
instead you could use:
Premature execution of the python remap by the read ahead may also be a problem. While 'yield INTERP_EXECUTE_FINISH' at the beginning would prevent that it would also bar the use of 'self.execute()' after it (as pointed out above). My usual workaround is to call the python remap through an ngc wrapper like this:
github.com/LinuxCNC/linuxcnc/blob/master...ting/python/remap.py
On this background I would like to point out a few general things:
You might want to put something like this at the beginning of your remap so it does not execute on load:
if self.task == 0: # ignore the preview interpreter
yield INTERP_EXECUTE_FINISH
return INTERP_OKAlso note this restriction for the 'yield' feature:
linuxcnc.org/docs/html/remap/remap.html
which means that code like this is not allowed:
if router_down:
print("Raising Router (P14)")
self.execute("M64 P14")
yield INTERP_EXECUTE_FINISH
time.sleep(2)
self.execute("M65 P14")
yield INTERP_EXECUTE_FINISHinstead you could use:
if router_down:
print("Raising Router (P14)")
self.execute("M64 P14")
self.execute("G04 P2")
self.execute("M65 P14")Premature execution of the python remap by the read ahead may also be a problem. While 'yield INTERP_EXECUTE_FINISH' at the beginning would prevent that it would also bar the use of 'self.execute()' after it (as pointed out above). My usual workaround is to call the python remap through an ngc wrapper like this:
o<m6wrapper>sub
M66 L0 E0 ;force sync, stop read ahead
(call your python remap here)
M66 L0 E0
o<m6wrapper>endsub
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