In article , dpb wrote:

Smitty Two wrote:
...

Here's one "assumption" I *am* willing to make: I'll assume that your
shop teacher was mistaken, or that you misunderstood him at the time,
because AFAIK there is no such thing as a "special drill designed to
melt through metal." ...

Well, one is a plasma, another uses laser, others that aren't exactly
"melting" but act similar use very high pressure water...

--

Those are metal cutting techniques, but they're hardly drills. Did you
actually read the post to which I'm referring?