The biggest issue aside from RPM is that drills are designed for loads along the axis of the bit and not the side loading created by router or Dremel carving bits. This is not to say that it can not be done though.

Greg

: Maybe a dumb question, but if I have an electric drill, is there a good
: reason why I can't put various bits in it other than drill bits? For example
: those little sanding or cutting accessories that go with Dremels or even
: router bits? I assume those other tools have different speeds or maybe
: even better speed control, which could be an issue, but since the drill
: bit holder is adjustable, I don't see why it couldn't hold them safely.

: Patsy (ducking in case what I'm suggesting is totally stupid and dangerous
: just to avoid spending money on more tools)