Run the saw fast and use plenty of WD40. Peck, and blow out
the chips every 1/8". Should take a minute a hole, tops, with a
bimetal hole saw. Less time if you use one of those nice carbide
hole saws.



With aluminum, little need for the carbide unless you want it just for the
larger gullets - which is an advantage.

Just make sure you're talking carbide teeth and not carbide grit. Doubt that a
carbide grit saw would get through a single hole in aluminum before it loaded
up.

John Martin