Quote Originally Posted by marbles View Post
I've been milling insulation board for ages with ground drill bits and ball mill ends but a someone requires styrofoam to be milled and it looks like it requires a different mill. There are specialist companies like Styrotec who make solid and hollow bits for polysterene but they are super expensive.

Where can I buy a cheaper alternative rotary rasps in 6-8 or 10mm diameter that will cut 120mm of cutting depth? see pics
hi mate, did you have any luck..?
ricicnc.com has some spirals and olivercorp.com make custom stuff... but where did you end up getting yours from and how much?