Review on Carbide Cutter Tools for Acrylic and Hardwood Cutting - Uxcell by Robert Farrar

I was using an insanely slow feed and it took 2.5 hours to cut through 6061 aluminum on the first try without breaking a single one. Went up to 6mm. 4200 rpm 2.5 inches per minute. I think it was about 0.0003 fpt 0.04 doc. Make sure you have a good, wobble-free spindle, an accurate machine, and lots of patience. Sometimes getting the job done is more important than going fast.