Grinding disk on my 4 1/2 in angle grinder....Just touch up the edge taking as little off as possible off...2x year
Have ALWAYS used files for sharpening...ALWAYS. Got plenty of time, but not much money to replace blades ruined by a grinder.
You are a far more patient (not to mention industrious) man than I. :smile: I've never ruined a blade with my bench grinder shape-wise or temper-wise and they always cut well, they just don't win beauty contests.
Retired guys have plenty of time to waste...but not money.