[TR] drill bits

Dave1massey at cs.com Dave1massey at cs.com
Fri Dec 19 10:54:12 MST 2008


In a message dated 12/19/2008 8:40:41 AM Central Standard Time, 
mmarr at notwires.com writes: 
> Also, don't forget that when drilling non-ferrous metals it is best to have 
> 
> zero or negative rake on the cutting edge of the drill, to avoid the 
> possibility of the drill digging in, picking up the workpiece (which you 
> didn't bother to secure to the table of the drill press because "it is just 
> one hole"), and spinning it wildly while it raps the knuckles of the left 
> hand.  I have the scars to prove it.
> 
Ditto, in spades, when working with plastics.  So save all your dull bits for 
when drilling softer materials.

Dave


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