14 years ago
the machine after I thought drilling sounded little different than usual
just to find that drill got little dull and it drilled one hole 0.22". No
problem I thought, I just tap it with a form tap. I have to say I use form
taps very seldom. The hole is fine when you check it with a thread gauge but
dia reminded 0.22". Are form taps not recommended for mild steel? I used
rigid tapping at 1000 RPM.