In article ,
Dave wrote:
Have you ever tried drilling a self tapper?

Going back to your comments about having tungsten carbide drills for
PCB's, could you get a pilot hole in the screws and open it up with the
right sized cobalt bit, freshly ground, of course?

I've probably got the right size tungsten carbide. Bought a load off a
workshop that closed down - including the ancient but very good PCB drill
press.

My thinking is, that if you have one of those 12 V and tiny hand drills,
it would be ideal to control where the twist drill can wander. Just
angle the drill slightly, at 90 degrees to the direction of error, until
the tip is pointing down the centre of the screw and bring it upright
again.

I'd say there's a very real chance of breaking a small tungsten carbide
used hand held.

That didn't look right. If the twist drill is wandering to the left, you
angle it to the left, until the drill cuts back to the middle of the
screw.

I could cut a cross with a Dremel to provide the centre?

--
*Virtual reality is its own reward *

Dave Plowman London SW
To e-mail, change noise into sound.