Tip 9# drilling hard steel

R

Reg ELLERY

Joined
Jun 22, 2002
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I have found that if you want to drill industrial band saw blade you can easily blunt the drill bit.

To get the drill through I use the slowest speed on the drill press.
Put on a couple of drops of a misture of thin oil and deturgent. I use a pilot hole less than 1/8. once the pilot hole is through I move up to 7/32.

When I tried to start with the 7/32 on high speed it just went blunt.

What do you blokes do.
 
I always wondered if a carbide end mill would work in a standard drill press--not for milling, but for drilling nice true holes in hard material?

Is this okay to do?

John
 
You might be fine with that setup, John. Just don't over-feed it, and keep it cool.
 
Originally posted by John Frankl
I always wondered if a carbide end mill would work in a standard drill press--not for milling, but for drilling nice true holes in hard material?

Is this okay to do?

John
Click to expand...

You would of course have to use the type of end mill that cuts downward, not just sideways.
 
Is that stuff L6? never drilled that myself, but more generaly I use regular bits, and sharpen them as needed, which can be a lot. Not a good way, but a cheap way. I just spin the bit in my finger (you can use a drill too) against a grinder, until I get a zero relief bullet head on it, and then I spot the bevels by eye. A sharp bit usualy cuts a lot better than when it comes out of the pack, and it only takes seconds. Once a bit is used up, I try to buy a better replacement for it than what i had in the first place. Then I usualy loose that, cause I put it somewhere safe, so it's back to scrounging around the shop, and sharpening. I'm a woodworker and my metalwork tools aren't all that well organized.
 
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