I cut alot of UHMW and HDPE. What size mill are you trying to use? In general spiral upcut 1 or 2 flute will work best. To surface a part without fluffing the material the leading edge of the mill should have a radius. The photo shows the larger mill (with radius) used to cut the surface of the part to the needed thickness. This part is nylon 6/6 with moly but the color shows cut path and finish well.
The pockets in the part in photo were cut with 3.2mm 2 flute spiral upcut (for aluminum) at 3mm cut depth per pass at 12000rpm and 6.3mm/s.
Carl |