I've been working on an issue for a while now, and I wonder if somebody has any suggestions.

When cutting arcs, the torch vibrates ever so slightly, as to cause a poor cutting edge. This doesnt happen on straight lines and circles, only arcs. I am mitigating the problem by running about 30 ipm, which makes the cut tolerable, but requires alot of cleanup. 12 ga steel @ 40 amps is supposed to be 70 ipm, which results in a jagged cut.

Stats:
-I am using servos in a rack and pinion system, with gecko drivers.
-Mach 3
-Sheetcam
-Solidworks to make dxfs

-Running in CV mode, plasma mode, angular discrimation set at 90*, no backlash compensation
-Arc are defined by only a few points in solidworks

-Hypertherm 1250, new finecut tips, .08 gap, no THC (it doesnt effect it), cutting 12 ga steel.
-4'x4' Dynacnc table

I am led to believe this is a CV problem, as it doesn't really happen with circles. I have tried every CV setting I can see, with no effect.

Any help would be appreciated.
-James