Thanks for the suggestions -
The mill is a brand new Haas VMC CNC (4 months old) and it seems to be in perfect alignment with no spindle runout or axial play.
The poor surface finish seems to be independent of cut depth, even a 0.001 Axial DOC cleanup pass still comes out rough.
When I replace the 3 flute high helix with a cheap 2 flute endmill, the bottom of the cut comes out like a mirror, but the performance of the pocketing operation is not nearly as efficient as with the 3 flute.
I've tried pretty much every speed/feed/doc combination, but still experience the same problem. |