Positive vs negative rake: surface finish

pos vs neg

I’m happy with both finishes but the finish left by the negative rake fly cutter is fabulous, almost mirror like, the positive rake fly cutter left a more matte finish. I think the lines are visible because the insert has a small radius (ie more pointy).
Not at all a apples-to-apples comparison, I’m prepping some steel (both unknown alloys) for a project and used best sized fly cutter on each.

Here is the 5″ fly cutter in action (the 2.5″ fly cutter video is in the previous post):

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