Glass Drilling ?

[Steve 926]

Hello,
I could use some info. on drilling the back of my 38 gal. I have a general drill guide for a hand held drill & a 45mm diamond hole saw. I intend to use mineral oil, or water as a lube while cutting the glass.
any idea as to speed of the drill, should I tape, & back up the inside with plywood to give it some support.
I was thinking about 3 1/2 to 4''down from the top edge of the tank for the hole. Never drilled any glass, but I think I can do it with some help

I would welcome any advice:smokin:

[TheSaladCo]

Suspense! ...
My prior experience with drilling glass is nill.
However, I read somewhere that tempered glass should not be drilled. Have you heard anything about that?

[Steve 926]

Yes, Thanks for the reply.
Tempered glass is a no no !! However in this tank only the bottom is tempered