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Thread: Flat bottom short drill bits

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    Supporting Member Christophe Mineau's Avatar
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    Christophe Mineau's Tools

    Flat bottom short drill bits

    Hi,
    In wood turning, I like inlaying some pearl dots in my pieces.
    For that, the best is to manage to drill a small hole with a flat bottom.
    For that purpose I once found in a shop an 8 mm bit that works very well (the white one, in the middle here below), but I can't find that kind of bit any more in other diameters, so I decided to make them :



    There is a 10 on the right and a 6 mm on the left. They are made from those useless too cheap bradpoint bits like the one at the top. They are always off center and cut very badly.
    So I cut them shorter, and grind two lips, at an high angle.
    I leave a small centering pin.

    I ground them on the metal lathe, using my Dremel attachment in the tool post, and a small cutting wheel in the Dremel.







    Obviously, the high angle, and the round (not drilling) pin in the middle, do not permit to drill more than a few millimeters, but they are not actually made for drilling, but for shaping the bottom of the hole.
    Works well, for what I need !
    Cheers !
    Christophe
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  2. The Following User Says Thank You to Christophe Mineau For This Useful Post:

    kbalch (05-29-2015)

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    kbalch's Avatar
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    Thanks Christophe! I've added your Flat Bottom Drill Bit to our Luthiery category, as well as to your builder page: Christophe Mineau's Homemade Tools. Your receipt:



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