I have a PCNC1100 Serial number 1141 I think. The machine is upgraded to a Series II.
Last week my spindle speeds were changing on there own at random.
It was late and needed my parts done so I started using M4 for a while instead of M3 and the symptoms went away and I finished my parts.
Today the condition returned and the spindle actually stopped running.
I shut everything down for a while and started it back up. Spindle started but the condition returned.
When the speed changes I can see it on the drive. I also think I can possibly hear a crackling sound coming from the drive.
Mach 3 is not aware of the spindle speed changes. Also, I am on mostly original parts on this machine except for the spindle drive upgrade which is original since its purchase.
I feel like it is the drive but do you know if it can be anything else?
TIA