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Thread: Simple but recommendation?

  1. #1
    Join Date
    Dec 2015
    Posts
    38

    Default Simple but recommendation?

    I am working on a project where I have to cut 100's of slightly over .5" holes .6" deep, then cut a .25 hole an additional .030 into the bottom of it. Is there a 1/4" bit I can use that will drill both cut the bigger hole, and the smaller hole inside of it but won't leave the rounded over hump in the middle since it's not traveling? This is hardwood by the way (white oak).
    Thanks!

  2. #2
    Join Date
    Apr 2011
    Location
    near Atlanta, Georgia
    Posts
    92

    Default

    Years ago I had a drill bit specially made to do that on a drill press. Have no idea where. Now, with the Bot I just set up a tool path to do it. Be careful when drilling a .25 hole with a .25 bit though going only .03 you should be ok. After starting 2 fires, I now use a 5 mm bit to make .25 holes.

  3. #3
    Join Date
    Mar 2004
    Location
    Delray Beach, FL
    Posts
    3,661

    Default

    You just need a 1/4" mortise bit.
    I believe Centurian has them.

  4. #4
    Join Date
    Dec 2015
    Posts
    38

    Default

    Quote Originally Posted by bleeth View Post
    You just need a 1/4" mortise bit.
    I believe Centurian has them.
    I’m having trouble finding one. Seems like I would need a down cut correct? Only thing I’ve seen is compression. Also, looking at the profile it looks like it would still leave the bubble in the middle?

  5. #5
    Join Date
    Mar 2004
    Location
    Delray Beach, FL
    Posts
    3,661

    Default

    A compression mortise should work fine. Putting a hole, or pit, in the middle of another pit is a pretty standard operation.
    Another option is to use a 3/16" bit using area clear for all.

  6. #6
    Join Date
    Dec 2008
    Location
    Diamond Lake, WA
    Posts
    1,572

    Default

    I only use boring bits for all my hole drilling operations. I run the spindle at 6400RPM. Nothing gets hot at these speeds and the holes are PERFECT, top and bottom. I stopped using cutting bits to drill holes years ago and am very glad I did. toolstoday.com has boring bits in all shapes and sizes.
    Don
    Diamond Lake Custom Woodworks, LLC
    www.dlwoodworks.com
    ***********************************
    Life is not a journey to the grave with the intention of arriving safely in one pretty and well preserved piece; But to skid in broadside, thoroughly used up, worn out, bank accounts empty, credit cards maxed out, defiantly shouting "Geronimo"!

    If you make something idiot proof, all they do is create a better idiot.

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