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Thread: Tooling question for the experts

  1. #1
    Join Date
    Oct 2010
    Gainesville Florida

    Default Tooling question for the experts

    Hey all,
    I have a new customer asking about cutting out 1/2" or 3/4" plywood parts with a 30 deg. edge angle. Has anyone seen a bit like a down spiral but with a 30 deg angle cut. I know I probably could cut it with a standard cutter and go back with a 30 deg V bit (if I could find a large enough one), but was wondering if anyone knew of a bit which would do it all in one? If it was possible to have one custom made, anyone see issues with the cutting forces? I have a PRS 9648 Alpha w/ 2.2 hp spindle.


  2. #2
    Join Date
    Mar 2009
    Parts and Templates, San Carlos CA


    Check Vortec. I have several of their insert bits and they are pricey but work very well.


  3. #3
    Join Date
    Oct 2011


    Remove the bearing and cut the bearing stub off:
    you won't be able to straight plunge with it, but you can ramp into the cut. I have done this with a 45deg cutter. I just chucked it into the lathe and used a drill bit to remove the stub that the bearing mounts to.

  4. #4
    Join Date
    Mar 2009
    Pope Valley CA


    Using a v-bit, you'd need a 60 degree, since they are spec'd by included angle. The 60 degree v-bit I got with the ShopBot Starter set is an Onsrud with 1" CED and 0.875" CEL, so is big enough to do it. I don't think I'd try the 3/4" material in a single pass, but it would probably be fine in the 1/2" material with your spindle. (Test first, of course)
    Ron Sloan

  5. #5
    Join Date
    May 2014
    Detroit MI


    I'd cut the parts to size or slightly oversized first, leaving an onion skin, and then cut the bevels with something like an Amana RC-1108. This will give you the longest tool life, as plywood will dull tools pretty fast.

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