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Thread: Drilling 3/4" ACX Plywood

  1. #1
    Join Date
    May 2012
    Location
    Venice, CA
    Posts
    8

    Default Drilling 3/4" ACX Plywood

    Looking to get recommendations on drilling 1/2" diameter holes through a 3/4" plywood.

    Need to determine both speed and feed rates as well as the proper bits to be using. I would prefer to use a 1/2" diameter bit.

    Spindle is a 5 hp columbo with max rpm of 24000

    Any recommendations would be helpful. Searching around I have found little information on the subject.

  2. #2
    Join Date
    Mar 2004
    Location
    Delray Beach, FL
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    3,708

    Default

    Try spinning about 8k and punching at .5. Upcut is best but ACX will likely have some tearout at the top. Up or down cutter use a peck with getting the bit out of the material one time about halfway through to clear the chips. Keep a close eye out for too much heat. It is the biggest issue with drilling on a cnc. Fires have been started that way. Lots of the time it is better to use a 3/8 and inside profile or clear with a 3/8 stepdown. Still will go pretty quickly.

  3. #3
    Join Date
    May 2012
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    Venice, CA
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    Default

    Thanks Dave worked pretty well. Had a little bit of tear out at the top but mostly due to the nature of the material.

  4. #4
    Join Date
    Mar 2004
    Location
    Delray Beach, FL
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    Default

    You're welcome Ilan.
    Glad it got you going.

  5. #5
    Join Date
    Dec 2007
    Location
    , Monongahela PA
    Posts
    26

    Default

    It might help to use a 1/2 brad pointed bit.

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