Steve,
Was that using the Spiral Gadget with an Archimede's spiral?
Can you try more wraps with the preview turned to Max....Think I ran across the same problem using VCP7 though..and wound up using circular array with a .5BN, but it was tricky getting it to toolpath the first 2 flutes (alternating start points) with a pass depth, and then arraying those 2 for full depth passes and having it not jump around so that I was taking off only at a time like on a 3D.
Last few I've done with VCP8 are all 3D rasters with the biggest BN I have.
Think I did it with the Spiral Gadget once for a golf ball size for someone else, but going to have to jog my brain in the morning and see if I can find the e-mail.
scott
scott P.
2013 Desktop/spindle/VCP 11.5**
Maine