Cutting fluid is at Ace Hardware. Yellow can for brass, green can for aluminum. I use the yellow can for zamac.
model-size taps can easily be ground with a Dremel cutoff disc and a magnifier. I modify any drill that I will use in brass, often sharpen drills down to #65, sharpen larger taps (4-40 and up) when desperate, and get hundreds of holes with home made bottoming taps.
Yes, you get the tap glowing red and it needs to be quenched. Smaller taps grind so quickly they don't get a chance to get red hot.
Anybody else have a brand suggestion? Stay away from hobby store taps.
