[TR] drill bits

[LBC.Resto]

"Low speed, plenty of feed" was the mantra we were taught back in the day.

--
Ian
62 TR4

-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of Dave1massey at cs.com
Sent: Friday, December 19, 2008 8:30 AM
To: triumphs at autox.team.net
Subject: Re: [TR] drill bits

In a message dated 12/18/2008 9:31:40 PM Central Standard Time, 
mdporter at 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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