In a message dated 12/18/2008 9:31:40 PM Central Standard Time,
mdporter@dfn.com writes:
> The most common mistake made with TiN-coated bits is
> not using enough pressure. Allowing such a bit to spin work-hardens to
> material to be cut and rubs off the coating, and the bit stops cutting.
Good point. Let me just add that the second most common mistake is too much
speed. Speed makes for friction, friction makes heat and heat will de-temper
the drill bit and it will quickly become dull.
Use a drill press whenever you can. A drill press turns more slowly than a
hand drill and the mechanical advantage afforded by the crank wheel means more
pressure will less exertion. That and a little lubricant can make you drill
bits last much longer.
Cheers
Dave Massey
St. Louis
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