I'm trying to size some roller wheels for our roll cutter, the inner diameter needs to be 2-1/2" and the outer diameter needs to be 3-1/4". I can't buy these anymore because the company went out of business years ago. I'm cutting them out of 3/4" HDPE (a hard white plastic)

Every time I make them in the program and then cut them they're always different sizes!! I'm using the circle tool and then sizing the inner one to 2.500 and then drawing another circle to 3.250 and I flip the outer one so it will cut on the outside of the line I'm using the cut path tool also and cutting at a depth of 1/8" per pass. is this not the way i'm supposed to be doing this?

Any help you can provide would be of much help.

Thanks, Chuck.