I milled some HDPE plate/sheet yesterday and was quite impressed at how easily it milled. At my 1500rpm max, I found that 5 ipm left a slightly frayed edge, but that went away at 10 ipm. 15 ipm was very clean as well. All of these at 0.05" doc, with a 1/8" EM btw.
So how would I do a 0.2" doc slow finishing pass with this? I expect I'd get the fraying if I ran slower.