Glass tank, diamond drill bit. Jumping on board this thread because I must be doing something wrong. I'm drilling 4 holes in my 120 (1/2" thick). I have been drilling for 5 days now (not continuous) and have only completed 2 & 3/4 holes. I have been drilling for three hours with a few breaks today and have only completed 3/4 of a hole.
Heres what I'm doing:
after marking where I wanted the holes I created a dam out of playdo and filled it with water to keep the bit cool. I didn't use a drill press or anything (which I'm sure is the way to go), just free hand. I'm drilling very slowly. Around 200 rpm per the instructions. Even slower in the begining to create a groove. After that I just sit there and let the drill do the work, without apply much pressure at all. Just sitting there holding a drill, trying to keep the trigger still and hold a even pace. Sitting there, until my arm starts shaking and I have to take a break, or the battery on my cordless drill begins to wear out.
Hopefully someone will post with some better input, but this is what Im doing and is how I understood it should be done.
At 200 rpm it will take a really long time to drill trough glass. When I drilled my tank I was running at about 700 - 900 rpm and it took 10 - 15 minutes to go all the way through a 3/8" back. I would up the rpm a little.
Is it a Home Depot special labeled "for glass and tile". If so keep going the way your doing it. If you have a glass and tile bit its just a tile bit and will cut if you go real slow. A real glass bit shoud cut each hole in about ten minutes. I use a plywood/glass sandwhich with a groove to drip water in. 3/4 ply will help guide the bit and help with arm fatigue.
Yikes! Now I KNOW I got a good deal when I had Issaquah Glass put 2 3" holes in the back of my tank! They charged less for both holes than I would have to pay for one of those drill bits. Of course getting my tank to them was a chore! Those big glass tanks are heavy!
yes it's for glass....and don't worry about it Mapster, as all info is appreciated....i just wanted to hear some horror stories....I have found bit's for around $20, but just the thought of drilling makes me break out in a sweat!
I have drilled my glass tank using those diamond bits from Harbor Frieght. These fit in a dremel or a Fordom hand piece (flexshaft) you get 20 bits for $7.00, yes $7.00 and it takes about 10 mins to do one hole. A lot cheaper than the diamond drill bits. These are more like burrs - diamond coated and last about 1 - 2 holes.