Re: [CAD_CAM_EDM_DRO] EMC - M codes pause motion?

foxprints2003 wrote:

>In EMC m-codes cause the interpreter to pause motion, example:
>
>g02x30y30i30j0f300
>g02x0y0i0j-30m7(or m8,m3,m4 etc.)
>EMC executes 1 quadrant arc, pauses motion, turns on M code output,
>resumes motion to complete arc.
>If the M code is removed the motion is executed seamlessly.
>
>I need to be able to turn outputs on/off on-the-fly, Is it possible
>to setup EMC to allow M code output on-the-fly?
>
>

M03, M04 and M05 are spindle start and stop commands, and there is
a built-in delay (specified in the .ini file) that stops activity
waiting for
the spindle to come up to speed, or brake to a stop. It makes perfect
sense in machine tool applications to have a delay here. Reducing the
delay specified in the .ini file should make it shorter, but I don't know
how short it can be.

M07, M08 andd M09 are coolant on/off commands, and it seems reasonable
that a delay is not always needed there. I think the problem may be
related to
the fact that the auxilliary I/O is handled in the Linux part of EMC, while
motion is done by the real-time part. I suspect that the pause is when
these
two parts are synchronizing for these operations.

Jon