Why are 2 surfacing cutters at 90° and 2 at 4–10°—why not make all cutters 4–10° for smoother cuts?
Amana Tool RC-2239 Insert Mini Surfacing & Rabbeting Flycutter 2+2 Flute Design 1-1/2 D x 1/2 CH x 6mm Inch SHK Router Bit, Includes 2 Each of HMA-12 and HCK-70
Regarding your two plus two surfacing bits. Why are 2 the cutters at a 90° angle to the cutting surface and the other two cutters are at approximately 4° to 10° to the cutting surface. In woodturning, I have discovered that I get a much smoother cut if the cutter is at an angle 4 to 10° to the surface being cut, rather and the ninety degree angle. At a ninety degree angle, the cutter is acting as a scraper, rather than a cutter. My question is, why not have all of the cutters at the 4 to 10°? Angle to the surface being cut?
Status:
Open Oct 22, 2025 - 12:35 AM
1answer
Answer
Oct 22, 2025 - 01:24 PM
Dear John,
That is the design philosophy chosen by Amana Tool and has proven to be very effective across their line of cutting tools. For more information, I would advise contacting them directly :)
Thanks,
Kevin
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