File:Drilling starts with center drill.jpg: Revision history

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17 May 2013

  • curprev 13:2913:29, 17 May 2013‎ Dnevil talk contribs‎ 304 bytes +304‎ All drilling operations should start with a center drill; this gives an accurate and clean starting point, and reduces the chance of the drill bit "walking" off center. From "Drilling" by Stan Bray, "World of Model Engineering" No 3, 1989, http://www.m...
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