I finally got around to trying Rustlick WS-5050 emulsion for hand
tapping in 1018 steel. It works quite well, and yielded nice smooth
threads.

I wonder if the concentrate works better than the emulsion. The
concentrate is $20/gal, which is a big improvement over $10 for 4 oz.

The test was cutting the 5/8-18 threads in the T-Nut for the Dickson
toolpost on the Clausing 5914. The tap is spiral-pointed (ie, a gun
tap) and was made by Greenfield.

Joe Gwinn