>The trick is to have a constant air flow onto the bit to keep it cool. You >need >to rig up your air hose, (from an air compressor), onto the drill press and aim >a steady moderate stream right onto the bit. Not only does this keep the bit >from over heating, but it also blows away the chips as you are drilling. > >Rob Goodale, RPT >Las Vegas, NV Double drilling works fine too. a 1/4" hole with the first pass clears out the bulk of the material, and it's not critical to keep the bit cool because it's just a rough-in. A second pass with the final size bit removes so little material that the bit doesn't tend to overheat nearly as much and I think I can get a more uniform result this way. Ron N
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