chatter from cutting x - y axis

[1enick72]

I have a Larken System 600LS with dual lead screws. I'm getting chatter mostly when cutting circles and some angles. Cirtain places seem to be worse than others. I do mostly 2D cutting and it doesn't seam to matter if it is 1/4", 1/2" or 3/4" material. I cut plywood and MDF. Is this an issue from the lead screw nuts, drive motors or controller?

[Larken]

We had some problems with the Kerk nuts loosing the tension spring and having backlash on those machines. Kerk makes a better nut now, but its a lot of work to change to the new one. It need to be machined in.

Which controller is on the machine ?

Larry