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Thread: Drilling

  1. #1
    Join Date
    Sep 2013
    Location
    Mahomet IL
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    21

    Default Drilling

    I'm still a beginner to CNC machining, and I need to know about drilling holes smaller than 1/4" diameter. Is there a trick to simply using a 1/8" drill bit for making holes without ordering a special collet?

    I assume the answer to this is "NO!", but can I use my 1/8" Tapered ball-nose to drill a 1/2" deep hole using a drilling toolpath?

    Are there bits available that are smaller than 1/4" diameter, but fit in a 1/4" collet?

    Any help would be appreciated. Thanks!

  2. #2
    Join Date
    Sep 2006
    Location
    Garland Tx
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    2,227

    Default

    Simon…
    You are correct… the answer is “NO”. You will use a 1/8” router bit. For holes that are 1/8” use a “peck” drilling toolpath and for holes larger use a spiral cutting tool path. You can get 1/8” router bits with a 1/4" shank from many sources or you can get a 1/8” collet. I recommend you forget the ¼” to 1/8” adapters as many here on the forum have had bad luck with them.

    Many CNC operators use a pocketing toolpath for larger holes as the plug is converted to sawdust rather than a projectile.

    If you need sources for anything I’ve mentioned, just say so!

    SG

  3. #3
    Join Date
    Jun 2004
    Location
    Springfield Mo
    Posts
    809

    Default drilling

    You can always use the bit just to "CNC mark" the holes, and then drill them to the proper size and depth with a regular drill.
    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....

  4. #4
    Join Date
    Sep 2013
    Location
    Mahomet IL
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    Default

    Thanks guys for your quick responses. I've been looking and think there are some perfectly good 1/8" router bits with a 1/4" shank out there.

    Simon

  5. #5
    Join Date
    Jan 2004
    Location
    iBILD Solutions - Southern NJ
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    7,931

    Default

    If you have a spindle order an 1/8" collet from SB or Techniks. If you have a router, order an 1/8" collet from PreciseBits.

    Strategy will depend on the material you want to 'drill'.

    Try to get away from necked down 1/4" shank bits. They are expensive compared to regular end mills, like 1/8 and smaller; they all take an 1/8" shank.

    -B
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - Vectric Custom Video Training IBILD.com

  6. #6
    Join Date
    Jun 2007
    Location
    Hampton Roads, VA
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    1,106

    Default

    Quote Originally Posted by bradywatson View Post
    If you have a spindle order an 1/8" collet from SB or Techniks. If you have a router, order an 1/8" collet from PreciseBits.

    Strategy will depend on the material you want to 'drill'.

    Try to get away from necked down 1/4" shank bits. They are expensive compared to regular end mills, like 1/8 and smaller; they all take an 1/8" shank.

    -B
    A bonus to getting an 1/8" collet is the ability to use dremel and rotozip bits. They are great and WAY cheaper than some sources. Up and down spirals are available. Quality has been acceptable for the price.
    "Once a person moves away from the computer and CNC some of the most important work begins." ~Joe Crumley

  7. #7
    Join Date
    Jun 2012
    Location
    Philadelphia
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    448

    Default

    I recently bought collets from precisebit and it is a world of difference over the stubby collet chuck I was using. There certainly is a noticeable difference in cut quality
    "The most valuable tool I have is the experience of others" - Me

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