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#1
03-18-2012, 08:46 PM
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I used a piece of plywood that has the same diamter hole in it to start the glass bit without sliding I kept a hose running and make sure you put a towel or something inside to stop the glass that grts cut out from falling and cracking the other side of tank
Go slowly a hole should take a full 5 minutes easy
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250G DD LED SPS R.I.P. 180G LED SPS 80"x36". 300G custom build Owner of Mountain Ridge Heating and Gas Class A gas fitter, HVAC 
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#2
03-21-2012, 05:45 AM
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2 Things I've learned.
First -- take a small bit of plexi and drill it first and use it as a guide. I tried plywood, but I found it much nicer to still see what I'm doing. Clamp the guide in place and the bit won't "jump" all over the place.
The other is to make sure you have something stiff (2x6, thick plywood) on the other side of the glass. This will reduce crazing when it gets really thin on the other side. I'm lucky and have access to a custom glass guy. When he drills thick glass, he has a double drill press that drills from both sides at the same time, which gives near perfect holes. I just wish I had a way to line things up that well. Oh, and take your time. I usually am holding some of the weight of my drll up near the end of a hole, as the slower you go at the end, the less crazing around the other side of the hole.
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