LS Tech and Moderator
Drill bit quality is a factor too as far as cut and being able to resharpen.
I just learned all of that by trial and error (mostly error) only recently. Yesterday I cut the stainless hinge I'm installing a little shorter with my hand grinder and a cut-off wheel the same way you described. It cut pretty fast. Trying to cut a long straight line with it (like I did with a band saw instead) is always a problem for me though.Stainless Steel is tough cutting. I usually use a cut-off wheel in my angle grinder. I buy the diablo wheels at Home Depot. They are only .040 thick and minimize the heat. They cut stainless very well.
If you are drilling in stainless, cobalt bits are the trick, as high speed steel bits will just burn up almost instantly. The key to getting cobalt bits to last in stainless, is to use very slow speed and very high pressure. I can usually get at least 10 holes in 1/8" stainless before I have to stop and sharpen the bit.
Most saw blades will burn up pretty quick trying to cut stainless, especially 300 series alloys.