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 :

http://www.labellenote.fr/file/homem...ll_bits_01.jpg

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.

http://www.labellenote.fr/file/homem...ll_bits_02.jpg

http://www.labellenote.fr/file/homem...ll_bits_03.jpg

http://www.labellenote.fr/file/homem...ll_bits_04.jpg

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 !

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:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="http://www.homemadetools.net/flat-bottom-drill-bit"><img src="http://www.homemadetools.net/uploads/118488/flat-bottom-drill-bit.jpeg" /></a></div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="http://www.homemadetools.net/flat-bottom-drill-bit">Flat Bottom Drill Bit</a> <span> by <a href="/builder/Christophe+Mineau">Christophe Mineau</a></span> </div> <div class="tags">tags: <a href="http://www.homemadetools.net/tag/drill-bit">drill bit</a>, <a href="http://www.homemadetools.net/tag/luthiery">luthiery</a>, <a href="http://www.homemadetools.net/tag/modification">modification</a></div> </div> </div> </div>