Stupendous Man wrote:
Am I the only one who has trouble tapping blind 1/4-20 holes? What a
pain in the ass!
I am doing better counting the thread rotations and reversing than
setting the depth stop.
Any tips from tap experts? I have a 500 or so holes to tap.
Machine is a Bridgeport mill with a Tap-Matic 50X

Check your tap drills. Tolerances vary from brand to brand.
Had a good brand-name maker drill give me fits until I found the holes
it made were undersized. Destroyed a half dozen taps before I learned
that little lesson. Don't assume.


Good luck

Jim Vrzal
Holiday,Fl.