also, bar soap works for a lube. best stuff, [in my opinion, your mileage may vary] is machinist's wax. works super on aluminum using course cutters at a somewhat slow speed.
most guys crank the speed to max, but slow and steady does the best job.
make sure to use eye and face protection ! if not, "You'll take yer eye out, kid !" [to paraphrase a popular movie saying. ]