if you look back at my post I said grind slow and repeat slowly cut it down or it gets brittle and breaks and I repeat you have to use slow even grinding. jimbo
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You may be right about brittle and break but I was responding to the ideas in some other posts about drawing the temper as in carbon steel. I have made bottoming taps out of taper taps and did cool them but it was because they got too hot on the fingers. It doesn't take too long to grind one down. Also better to start the threads with a taper tap and finish with the home ground bottoming tap.
Yes,
I save broken ones or ones that start to wear or chip on the bottom for this purpose.
You can take a zip wheel and cut them off. Keep the tap cool like every one else says.