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?