I try to design to avoid the need for bottoming taps but, in the past when I've needed one, I've made them this way...
Rather than grind the tip off, which extends the risk of overheating, I cut the tip off with a cutoff disk mounted in a Dremel tool. I have a tiny shop vac that I use for small clean up jobs. I mount the hose to the exhaust port and arrange it to blow over the tap while I'm cutting. By pecking at the tap with the disk, the risk of overheating is reduced considerably.
Still, there are very few situations that absolutely require bottoming taps; designing the need away is still the best solution.

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