On Mon, 11 Mar 2013 20:32:59 -0500, Tim Wescott
wrote:

On Mon, 11 Mar 2013 12:24:16 -0700, Gunner wrote:

On Mon, 11 Mar 2013 13:08:35 -0500, Tim Wescott
wrote:

So I'm fabricating some stuff out of 40 mil 304 sheet ('cause that's
what I could get from McMaster -- I know now it was a Bad Choice for
doing lots of drilling and whatnot).

Thanks to some input here, I'm doing pretty good, but I noticed that the
sheet seems to be fairly well annealed on one side, but really hard on
the other. Trying to drill 1/16" holes in the stuff, it makes an
enormous difference (like, between success and failure with a side of
broken drill bit) whether I start drilling on the "good" side or the
"bad" side.

Is this common?

Yes unfortunately.

And always remember

"303, thats for me!"
304..shes a whore!"

Yes, I was thinking that when I was looking ALL OVER for 303 sheet about
that thick.

I have figured out the right feed rate to drill the stuff. It goes
through like I'm drilling really hard lead (if that makes sense), with a
"crack!" at the end when it breaks through the hardened material.

It does dull drill bits amazingly fast -- I didn't used to be able to
sharpen 1/16" drill bits by hand on a grinder, but I sure am now!

I recently drilled some holes in 1/4" 304...using a fresh tip and my
plasma cutter. Saved a bunch of time G

Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie