Hi all! I recently completed a LMS 3990 CNC conversion and I've started playing around with some of the wizards in Mach3. I've come across something kind of strange and I'm hoping someone can provide some advice. I was running a rectangular pocket wizard to surface a piece of aluminum that's firmly held in a vice and I'm getting odd results. Hopefully you can see from the attachments, but one side machines perfectly and the other side is left with a pattern of evenly spaced circular marks that I can feel if I scrape my fingernail over the surface. I flipped the part over and ran the code again, and got the same results. Does anyone have an idea why this is happening? I'm new to all of this so I'd really appreciate some advice.