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Drilling copper

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mcr:
How to anybody?

Bernd:
Try with regular milk.

Bernd

Edited: I'm not being funny here. Guy Lautard said this in one of his Beside Readers. I guess it really works. I've never tried it.

andyf:
Received wisdom (from late lamented engineer father-in-law) is to dub off the cutting edges of the drill bit, so they have zero or even positive rake. I suppose that's akin to using 0 or positive rake for turning brass. If it's thin sheet, it would do no harm to increase the angle on the end of the drill from the standard 118 degrees to 150 degrees or so, to give it a chance to start making a proper hole before it comes out the other side and starts yanking itself through.

Andy

chuck foster:
im watching this thread cause i have never been able to drill a round hole in copper.  :bang:
the drill always grabs and tears it way through leaving a egg shaped or octagonal hole.

so lets hear the ideas that will make copper drilling easier.

chuck  :wave:

Bernd:
Use a sheet metal drill. It almost looks like an end mill except it has a point sticking out in the middle. Something a kin to a wood spade drill.

Bernd

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