I am modding my Gigabyte 3D Aurora 570 case by drilling three 1 1/2" holes across the lower half of the front door. This is made of 3/16" (approx.) cast aluminum. I plan to use a 1 1/2" bimetal hole saw to do this. I have never cut alum this thick before and I would like advice about whether to use some kind of cutting lube because of the thickness and some idea of what drill speed I should use.
I don't have a drill press. I will be using a 1/2" B&D variable speed drill for the job. Any tips I can get would be greatly appreciated. Thanks.