09-18-2013, 01:31 PM
When I was running a radial drill years ago (1982-1987) I tapped a LOT of blind holes under power. I got very good at it because I'd wrap some masking tape around the tap at the depth I needed to go and never broke a tap! I used spiral point taps and simply dug the chips out after it was done. They were mostly 1/2-13, 5/8-11 and 3/4-10 threads, so very sturdy taps.