Replies

1. 
   JohnWW | Jan 15, 2008 08:44pm | #1

   Chris,

   Here's a very nice chart courtesy of the competition: http://www.ibiblio.org/twa/info/drillSpeedChart.pdf

   In general, for drilling wood the slower the speed the better, until you get down to a 1/4" drill bit size.  Larger drill bits easily overheat in wood because there is no lubrication, friction is often high, and the wood doesn't conduct heat away from the bit the way metal would.  A slower speed reduces the chance of overheating and ruining the temper of the bit, many of which are carbon steel and as such are easily damaged by excess heat.

   John