On 6/5/25 07:53, Chad Woitas via Emc-developers wrote:
Related?
https://github.com/LinuxCNC/linuxcnc/issues/3355
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________________________________
From: David Mueller <mueller_da...@hotmail.com>
Sent: Thursday, June 5, 2025 5:08:41 AM
To: emc-developers@lists.sourceforge.net <emc-developers@lists.sourceforge.net>
Subject: [Emc-developers] Proposal: Change default behavior on abort to 'M2'
Hi all,
I'd like to invite you to discuss this PR to change the default behavior
on program abort from, basically, doing nothing to 'M2':
This would affect my setups as I am a user of closed loop
stepper/servo's which have an error output I wire up to the E-Stop
circuitry, which for all my machines causes a stop AND total powerdown
if a driver sees an error. I expect to have to fix the jam reason that
caused the stop, rehome the machine since a powerdown loses home, and if
possible, run-from-line to restart. Having the whole machine reset by
the M2 would lead to some interesting results not limited to loss of the
partially done part.
This scenario has been well tested here, but I should note also, such an
E-stop has never occurred since switching out the std steppers unless
I've left a wrench someplace to block motion. That obviously is my
fault. And the E-stop activates so fast I have not chipped a carbide
tool when actually hitting it against a chuck jaw to test it.
Bottom line is a NO from me.
The other advantages of these motors is they run 60C cooler, and
because the drivers allow much higher motor voltages to be used, the
machine (if a printer) is up to 10x faster and far more accurate. The
accuracy improvement is a side effect of doing away with the PID's, they
make the motors stay exactly at the trajectory planners output. The
encoder from the motor goes only back to the driver, NOT to LinuxCNC and
the driver controls the motor currant on a microsecond to microsecond
basis by the error the driver sees. So accuracy is +- one count of the
motor encoder. Most are 1000ppr, or 4000 in quadrature.
https://github.com/LinuxCNC/linuxcnc/pull/3459
Reason for this is strange and unexpected behavior as described here:
https://github.com/LinuxCNC/linuxcnc/issues/2908
https://github.com/LinuxCNC/linuxcnc/issues/2745
The underlying issue is rather complex as parameters and status channel
values are clearly not updated the same way. Given the shortage of
personnel it seems unlikely that this is going to be mended any time
soon. Meanwhile resetting the controller by executing 'M2' has been
shown to fix the above behavior.
Thank you.
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Cheers, Gene Heskett, CET.
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