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Thread: Maximum Cut Depth for Tapered upspiral Ball Bit in Birch Plywood.

  1. #1
    Join Date
    Feb 2013
    Location
    Healdsburg CA
    Posts
    18

    Default Maximum Cut Depth for Tapered upspiral Ball Bit in Birch Plywood.

    Can anyone give a recommendation for maximum cut depth for a tapered 2 flute upspiral ball bit into a Birch Plywood Sheet?

    The link to the bit specs can be found here:

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    If anyone has recommendations for speeds and feeds I will take those too.

    Thanks,

    Mike

  2. #2
    Join Date
    Mar 2005
    Location
    San Jose, CA, USA
    Posts
    672

    Default

    According to the spec sheet:
    Cutting Length 1.25 inches
    - Randall Newcomb
    10 fingers in, 10 fingers out
    another good day in the shop

  3. #3
    Join Date
    Feb 2013
    Location
    Healdsburg CA
    Posts
    18

    Default Trying to determine the depth of cut

    I attached an image of the type of cuts I'm trying to make with this tapered bit. The overall slot depth is about 3/8". Is it recommended to make a cut this deep in one pass with a tapered bit that is roughly a 1/16" wide at its tip and tapered at about 4 degrees? I'm more accustom to calcing the depth of cut with a straight bit and in this scenario I try not to exceed the depth of the bit diameter. Not sure how that logic would inform this scenario. Any help is greatly appreciated.
    Attached Images Attached Images

  4. #4
    Join Date
    May 2014
    Location
    MA
    Posts
    456

    Default

    I wouldn't go full depth with that bit. I'd do 1/8th passes, 2.5IPS to start at 12-14K RPM

    Just because it's got flutes all the way up doesn't mean it can cut any material in a pass that's as deep as the flutes.

  5. #5
    Join Date
    Dec 2000
    Location
    Thorp, WI
    Posts
    2,678

    Default

    I'm with Eric on this one. In fact, depending on the material and since the tip is 0.0625" diameter, I may be even a little more conservative.
    Scott

    If guns kill people, I guess pencils misspell words, cars drive drunk and spoons make people fat.

    "Those who hammer their guns into plows, will plow for those who do not" - Thomas Jefferson




  6. #6
    Join Date
    Mar 2004
    Location
    Delray Beach, FL
    Posts
    3,708

    Default

    Looking to bend the ply?
    If that is your purpose you can make the bending kerfs a lot quicker with a saw.

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