1. #1
    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
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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