Strictly speaking yes, although in the context of modern heavyweights Im afraid a drill is barely a weapon at all. It might be more dangerous to the audience than another machine since if a large drill bit broke under impact, pointy bits of metal could conceivably be thrown up and into the crowd, or at least onto the heads of roboteers.
The main practical problem is the transportation costs of a heavyweight arena with a solid roof strong enough to contain high speed shrapnel thrown up by high energy rotating weapons. Dont be put off though; Scorpian does pretty well with just a scoop, for example.

(Message edited by lex on August 05, 2007)