I post this cut quality question on the Mach3 forum. I'm just cutting a simple cam 2.5d profile, it sounds super smooth while cutting but I get slightly wavy and bumpy cuts. This is answer I received, but don't know how to correct this in Rhino or Madcam? Suggestions?
Check your Gcode - if the curves are comprised of many straight lines then the answer is with your CAD/CAM and it's Post Processor.
(Vectric, for example, will enable 'curve fit' to replace the many straight lines in an imported dxf and then the final Mach3 post processor will use 'arcs' (G2, G3) for the toolpath).