Scott Dorsey wrote:

You CAN drill large holes in aluminum with a hole saw intended for wood.
Not one of the adjustable ones, but one of the formed metal ones like Black
and Decker sells, where you have one center assembly that holds a centering
bit and then a formed metal blade for each size that screws into the center
assembly. Run very, very slow and keep the blade as wet as possible with
cutting oil or automatic transmission fluid. If you are careful you can get
a nice cut this way. It will wear the blade a lot more quickly than wood,
of course.
--scott

You want to cool the cutting tool, not lubricate it. The ATF is not a
great idea. Cutting oil is intended to cool the tool, to extend its
life. When you lube a bit or saw it tries to slide over the metal,
rather than cut it.

--


Michael A. Terrell
Central Florida