I am running a 1 inch single flute Shear Hog as a fly cutter at 4000 RPM, 50 IPM and .05 DOC. Working great so far. The insert in the Shear Hog is a year old, and has never been rotated. I'm using a mixture of 25% A9 mixed with WD40 for lubricant.
Not a big enough cut/part to worry about heat.
I used to run the same cutter in my FADAL at 10,000 RPM, 100 IPM and a
.200 DOC, but I had 22 HP to spin it with.
In that case, it didn't make chips, it made chunks.
You can buy GOOD PARTS or you can buy CHEAP PARTS, but you can't buy GOOD CHEAP PARTS.