Thanks for the feedback, I do like to get people's take on things, I've learned a lot that way.
Oldboy the cutter shank is held in with an R8 collet, this one happens to be 27/32, but you could make it whatever. I'm happy enough with this cutter that I think I'll end up making a smaller one of the same design for narrower material.
Doubleeboy I'm curious as to what you mean blue or gold chip speed, is this faster feed, or higher rpm? Or both? I'm still trying to learn the ropes of feed/speed so any info on it to get a better finish will highly valued. Especially for hot roll, simply because I have an almost unlimited free supply of it so I tend to use it frequently.
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