Not sure if this is the correct place for this post ?
Looking for advise on cutting Acetal / Delrin 12.5 mm thick . I im getting reasonable results at 20mm per second at 20,000 rev per minute 3 passed last pass .5 offset with a 6mm twin flute bit but Still minor chatter marks on the edge. The work piece is held down well so maybe a different cutter or feeds and speeds need adjusting ?