Originally Posted by Cheechako
I assume we are talking a 6 or 8" diameter hole. Forget a hole saw for that. You would need a big 1/2-3/4HP drill for that. They are dangerous! and big. alot of power there. Jig saw with the right blade may work. iron is pretty abrasive, I guess you would need a carbide hole saw? or several high speed steel
ones.... big $.
I knew a guy who lost
a finger and severely damaged another one using one of those big drills. The 3/4" drill jammed, the drill motor
spun immediately wrapping the cord around his fingers and the trigger, couldnt stop it. twisted on finger right off. yuck.
I used to routinely cut 6" holes with a hole saw. Yes it does take a few batteries, in a good 1/2" cordless, but the time spent charging
is infinitely better than the afore mentioned binding of the saw with a plug
in drill. I have done this with the plug
in before, but only once.......and never again.