Plasma Torch moves up and down slightly about 3 times a second. Looks like it's trying to sew. Changing tip volts changes the height the bounce happens at. Bounces about 1/32"

Mach3

I'm probably missing a THC setting of some kind?
Any suggestions?

DynaCNC w/4000 series controls, Cutmaster 52.

Slow Down the THC speed %   ,   The Z is moving faster than the THC can compensate and it oscilates.

(;-) TP