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Leonid,
> Recommendation "not to use center punch" because it toughens the
> metal is a nonsense, because you do want to toughen the area that
> you drill.
Twist drills flex and take the path of least resistance. Trying to
start a hole in the hardest part of the metal (centre of the punch
park) is asking for problems.
Besides it is difficult to centre punch dead on. With a little ball
burr you can drag the indentation to the exact position. I'll use a
centre punch on big crude work when I don't really care exactly where
the hole is (2" steel angle iron ) but not on jewellery.
Jeff
Demand Designs
Analog/Digital Modelling & Goldsmithing
http://www.gmavt.net/~jdemand
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