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| Adam |  Turtle shell drillingJuly 22nd, 2005 02:20 AM I tried posting this to the Woodcentral.com site, while Sears.com and Craftsman.com were down for "scheduled maintenance" (wink, wink, nod, nod, herumph). But, I don't got no workin pass port words for the udder board yet. Didn't want to waste it, and it's a good piece on reverse-twist drills. The post it's replying to says that they were told to use a reverse drill to drill holes in their snapping turtle shells. It's a different kind of bulletin board than this one. July 21, 2005 Reverse drill bits Reverse drill bits are commonly used in drilling extraction holes for "Ezy-outs" or other broken fastener extractor tools. The "reverse" twist of the drill allows drilling the centered extraction hole without rotating the broken fastener ****her or tighter into the threaded hole. With any degree of luck, the broken off piece will reverse out while drilling. Three thoughts concerning drill bit break out. A sacrificial backing material, like a wooden board, would allow the drill to penetrate the back of the hole without damaging the top material. A drill bit carefully ground to "zero rake" would do a scraping cut more than a screwing cut (no work piece grabbing). A drill press, with the shell gently clamped down, would allow much greater control of the rate of feed and how aggressive the exiting drill bit behaves. I hope this helps. |
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