Not sure if this post even goes here, but here goes.
I am doing some Vee engraving in vinyl for someone (or more specifically, recycled milk jug material, the stuff they make decks out of), but I'm not getting a clean cut.
I'm using a porter cable 7518 at 21,000 rpm, feed rate 60 ipm, with Whiteside bit 1541 (3 flute 60 deg). I have a lot of flakes down in the grooving that won't come out. Am I getting material re-welding due to friction?