One shortcoming of self-centering drill bits (also known as Vix bits): Their flutes tend to clog with drilling debris.

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One shortcoming of self-centering drill bits (also known as Vix bits): Their flutes tend to clog with drilling debris. A simple solution is to have nearby a block of wood with a hole in it larger than the drill bit but smaller than the metal housing around the bit. After each hinge hole you drill, simply plunge the spinning bit into the hole in the block to discharge the flute debris.
—Joe Godfrey, Forest City, N.C.