I used a whiteside 1/4" Spiral end mill for the clearance cut and a whiteside double flute 60 degree vcarve bit for carving. I ran the end mill at 1400 rpm at 100 ipm and the 60 degree vcarve bit at 1400 rpm at 50 ipm. Cotian will make short life of the vcarve bits if run too fast.Nice plaque! I have yet to cut Corian but I have some for when I have time to venture down that road. What bits/speeds/feeds did you use?