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Some drill bits
, particularly large-diameter bits, tend to cut very aggressively, which can lead to a blowout on the back side of the board being drilled when the bit pokes through. This is especially problematic using auger bits and spade bits, which often tear rather than cut the wood as they plow through the board.
If you need to cut large-diameter holes with one of these bits, you can take some steps to diminish the possibility of an unsightly blowout. Read these tips in Avoiding Drilling Blowouts.
(c) 2014 Chris Baylor licensed to About.com, Inc.
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Original story here.