How to turn off coolant and spindle (independently) while on feedhold?

[karoria]

Is there a way or realtime command in grblHAL for turning off coolant and spindle independently? What if accidently a cycle start is issued if spindle is off? Any safety algorithm is there like spindle turns on automatically and after some delay it resumes program?

[terjeio]

Is there a way or realtime command in grblHAL for turning off coolant and spindle independently?

Yes.

What if accidently a cycle start is issued if spindle is off?

If stopped during a feed hold by the override command it will be restored, if not running prior to the cycle start it will remain not running.

Any safety algorithm is there like spindle turns on automatically and after some delay it resumes program?

Yes - spindle state should be restored on resume.

[karoria]

Thanks.