When power tapping in the lathe I would put the tap in the drill chuck, add a squirt of oil and with slowest speed get started and let it draw itself in, then reverse out.
Trouble is the chuck soon runs out of grip. Hard steel against hard steel.
Then I have to resort to the handle to complete.
So what do you use to hold your taps when power tapping....up to M12 or 1/2" or even bigger?