Hi,
I'm using a 6mm diameter compression bit to mill a 10mm thick plywood sheet.

I have a MM-1000 spindle with a Stepcraft machine.

My settings are:
21000 RPM
40mm/sec feedrate
1.3 pass depth

For some reason the spindle lags and jumps a bit sometimes, as if it's running through a tough spot in the wood. That's how it "sounds" like, because it soudns like it's skipping a few spins, but the plywood
doesn't have tough spots and I don't understand why it's not a smooth sound.

Has anyone run into this issue?
I've tried going 30mm/sec but that didn't really help.


Thanks