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Thread: Drill bits with 1/4" shank

  1. #1
    Join Date
    Nov 2011
    Location
    Southern CA
    Posts
    25

    Default Drill bits with 1/4" shank

    I need to drill holes with a 13/64 bit - (into plywood) -- can you recommend a drill bit manufacturer that has 1/4" shanks so I can use them in my tool holders - I'm running a PRS ALPHA ATC and don't have a 'chuck attachement'

    thanks!

  2. #2
    Join Date
    Sep 2008
    Location
    2328 Morris Creek Road Stanton, KY.
    Posts
    1,906

    Default

    [QUOTE=BPM;166383]I need to drill holes with a 13/64 bit - (into plywood) -- can you recommend a drill bit manufacturer that has 1/4" shanks so I can use them in my tool holders - I'm running a PRS ALPHA ATC and don't have a 'chuck attachement'


    never drill with your shop bot router or spindle. Instead do a pocket to the desired depth.. bearing not designed to drill.,,,,,,,,,,,,,,,,,,,
    www.tgdesigns.net
    eking1953@yahoo.com

    HE WHO WORKS WITH HIS HANDS IS A LABORER.
    HE WHO WORKS WITH HIS HANDS AND HEAD IS A CRAFTSMAN.
    HE WHO WORKS WITH HIS HANDS, HIS HEAD AND HIS HEART IS AN ARTIST.
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  3. #3
    Join Date
    Jun 2011
    Location
    Melbourne, Australia
    Posts
    1,010

    Default

    Carbide brad bit from Tools Today is the best solution. Run at 6000 and it will last for yonks. Under $20.
    Buddy BT48 with 6' power stick
    2.2 HSD Spindle
    Aspire 9.5
    6" ShopBot Indexer

  4. #4
    Join Date
    Jun 2004
    Location
    Springfield Mo
    Posts
    851

    Default one option

    One option might be to mark the hole locations...with say an 1/8 bit.... with the Bot and then drill them out to proper depth with a proper tool.
    The decimal point seems to be the most important on the z axis... x & y not so much....
    ShopBot... Where even the scraps and things you mess up and throw away are cool....

  5. #5
    Join Date
    Apr 2013
    Location
    Kennebunkport, Maine
    Posts
    4,419

    Default

    Profile toolpath with 1/8" endmill using a spiral ramp? Watch your chips and bit temp, ramping really affects the MX,Y actual speed so may have to get more aggressive MZ or drop your speed. Did these .32 and .38" holes with a 1/4"UP and bit was cool at end of 500+ holes.
    Attached Images Attached Images
    scott P.
    2013 Desktop/spindle/VCP 11.5**
    Maine

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