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Thread: Bit choice for a project

  1. #1
    Join Date
    Feb 2020
    Posts
    9

    Default Bit choice for a project

    Hello all,
    I am new to the forums, new to Shop Bot, and new to CNC routing. I have successfully completed a project in Polycarbonate and now I am ready to move to another project.

    I have a concept of making a display board for round patches - the kind you might sew onto a jacket.

    I was thinking of a 24" x 36" overall size with multiple 3-3.5" diameter circles at a 0.25' depth - cut out in an array. I want to use a veneer surface plywood - so my thought was a compression bit but I am making pockets so would a downcut bit be better?

    Thanks,
    Clint

  2. #2
    Join Date
    Dec 2000
    Location
    Thorp, WI
    Posts
    2,775

    Default

    FEM downcut for clean surface edge and clean bottom. Do a final shallow bottom pass if you want a real nice bottom. If the bottom being clean isn't as big a deal, use a standard downcut.

    https://www.centuriontools.com/colle.../downshear-fem

    "It’s easier to fool everyone than it is to convince them they've been fooled" - Mark Twain





  3. #3
    Join Date
    Jan 2008
    Location
    Hobby-Tronics, Chiloquin Oregon
    Posts
    1,339

    Default

    "veneer surface plywood" I've had some issues with 'some' veneers, so do a test cut or two before doing a big job. If it's a critical edge recess I also cheat a little and make a pass with a pointed round over bit by lightly scribing the edge of the 'hole'. Seems to keep from getting tear out as the bit goes 'around' the hole while cutting the veneer. BTW welcome! Russ

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