replying to Pop, Jason wrote:
Very creative answer, but it does show ignorance of electronic circuits. It's
quite unusual for electronic components to be rated under 25 or even 50 volts,
so it's very unlikely that 18V vs 12V will cause voltage breakdown in any
circuit component.

In an electric drill, heat is generated by the arcing at the brushes and also
from electric current passing through the file windings. Here the higher
voltage will push a higher current through the drill, which will cause more
heating. When the drill is used at slower speed, I would expect it to work
just fine. With extended drilling at full power, I would expect the drill to
heat up more. Whether this causes a problem will depend on how good the
original thermal design was. I've had 120VAC hand tools heat up and die when
run for extended periods. Some tools are designed only for short term
intermittent use. It's easy to tell when a tool overheats - just stop and let
it cool.

For short term drilling, it would probably work fine, perhaps run a little
warmer.

Design Engineer

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