When cutting hard materials or very deep carvings the tool may vibrate or chatter causing marks on the job.
A tip for improving the the surface finish is to,
1. Calculate the toolpath using multiple Z Level passes
2. On the machine - Set the Z zero position for the tool slightly high (ie 0.02" or 0.5mm) and run toolpath 1.
(this will leave material on the job)
3. Calculate a second toolpath that cuts the job in a single pass
(Set Cut Depth = greater than the actual Min Z depth displayed for toolpath 1)
4. On the machine - Set the Z zero position correctly and run toolpath 2
This toolpath will remove the remaining 0.02" / 0.5mm cleaning-up the surface finish.
If you would like a more detailed explanation e-mail - support@vectric.com