I recently finished building a CRP 48x48 with a 2.2kW aircooled spindle and now I am doing some test cuts. I have tried with a 2 flute 1/8" endmill and a 4 flute 1/4" endmill. The cuts were done in 1/2" oak plywood, plunging down half the diameter of the tool and then routing in a straight line for 2". The 1/8" endmill I cut at 45 ipm and 18k rpm, based on a 0.01 chipload. The wood burned badly and there was a lot of splintering on the surface. Then I tried the 1/4" endmill, which I slowed to 13.5k and cut at 135 ipm based on 0.01 chipload. Again the wood burned badly, and the edges of the cut look folded up. I then tried various feed rates from 70 to 160 ipm, but didn't see much improvement with the edge finish or the burning. The 70 ipm definitely burned the most, as I would expect, but I would have thought that 160 ipm would have stopped the burning. Am I still cutting too slow?