by sebmay » Tue Sep 05, 2017 6:49 pm
Hello,
Sorry for the late feedback : i am not at the cnc place, but i can tell that the regular "fast" feed for Z is 500mm/min, and because the head is very heavy, the acceleration is poor, I.E. it takes time to stop. But i always do a G31 Zxx F100 as fast probe, then go back up relatively 2mm, then G31 Zxx F30.
But the logic is this : when i use the percent acceleration for feed, this is mostly because i missed to set up a reasonnable fast speed when generating Gcode. I compensate by setting the feed multiplicator. Or because i feel like the result of cuttings are so good that i may accelerate what was at first guessed.
I never do the same work twice : there is no option to correct for the next time.
But in my M6 (generated dynamically with each job), i cannot anticipate the coming multiplication of the feed rate.
For now, i solved the problem in my M6 generator by adding a push of the multiplicator coefficient when entering the M6, setting 100%, doing what has to be done, then pull back the coefficient.
I took note of the fact that the returned value is the one sensed when the detector trigger.
Anyway, between 100mm/min and 30mm/min, i get almost 1/2mm of difference. It's huge when carving a PCB. That's why my question is.
Thanks for your attention.
I will send my accell/max speed value later tomorow.
Sebastien