i used a dremel with a number 7144 bit.it was very easy and i can make alot of other cuts then just holes.i cut a few slots and an overflow.i was very surprised at how quick it went even though the glass was from a ten gallon and very thin.

I've used these before and they cut pretty good thru glass. Just take your time with your cuts.

http://www.leevalley.com/wood/page.a...30,43409,43425

You can get these as well, but the $25.00 difference still makes a difference to my pockets.

http://www.leevalley.com/wood/page.a...30,43409,43425

check princessauto.com
they have even better deal

Tak

i always break those cheap dremel bits :|

Masked Reefer, have you used those economy bits to cut glass? I'm going to have about 8 small tanks to cut some holes in and do you think the ones from Lee Valley would be alright or should I stick with the Dremel diamond bit?

Doug

i think i may just get a bit off ebay... but at those prices i will only go with one size...

what size bit do i need for 1" bulkheads?

i figure if i go with that size, if i need more flow, i can just add drill a second hole.

Yes, I have used those economy bits to cut glass. I've cut 2 holes, approximately 1-1/2" diam X +/- 1/8" thick, with one bit. I probably could still cut one or two more holes from that bit. I guess it's your call on the Lee Valley or the Dremel bits. I'd ask others also to get their opinion. I'll be cutting a 65gal here shortly, maybe I'll start a thread on "Glass cutting, economy style":lol:

smokinreefer

I pretty sure you'll need a 1-3/4" hole for a 1" bulkhead.