Double drilling pinblocks: Hand held versus drill press.

[Michael Gamble]

Hello List and David L
In the metal engineering world there is an old "dodge" that by initially
sharpening a drill bit so that one cutting face is longer than its pair, the
bit can be made to cut oversize. How does this help? It follows therefore
that the drill you use to cut a "hole-in-one" must be very accurately
sharpened. You can get away with this to a degree by using a "roughing"
drill followed by a "finishing" drill. In an earlier post I suggested that
to make a drill cut more precisely to its stated size the cutting corners
should be rounded off. OK?
Michael G (UK)