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Old 02-02-2011, 07:16 AM   #1
reefer_rylan
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Drilling a 125


How hard and expensive is it to drill a tank, and add dual over flows? What kind of drill bit will I need? Is a normal drill Ok to use as long as I have a proper bit? I plan on trying to do dual overflows on a 125g aquarium.

I have to admit I am a little nervous about drilling into the tank. Is it likely that it might crack? Is there anything that I can do to make sure it doesn't crack?

ANY INFO IS APPRECIATED!!!!!!!!!
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Old 02-02-2011, 07:31 AM   #2
sha_ggy13
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There are several youtube videos that go step by step. Need a glass cutting hole saw. A job specific tool. and duct tape. and some way of keeping the saw bit clean. I can't remember exactly what it is called but there is some kind of bond-o (like play-do) that you can mold and form into the shape of a ring that you place on the tank and you put water in it to keep the saw bit clean.
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Old 02-02-2011, 07:41 AM   #3
AnthonyK
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Are you drilling the back or sides? Keep in mind that most manufactures use tempered glass at least on the bottom and it cannot be drilled - it will shatter the minute you touch it with the bit!
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Old 02-02-2011, 08:46 AM   #4
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Originally Posted by sha_ggy13 View Post
There are several youtube videos that go step by step. Need a glass cutting hole saw. A job specific tool. and duct tape. and some way of keeping the saw bit clean. I can't remember exactly what it is called but there is some kind of bond-o (like play-do) that you can mold and form into the shape of a ring that you place on the tank and you put water in it to keep the saw bit clean.
You can use anything, play douh, wax clay, modeling clay, anything that will form a well and hold some oil should do...

as for cutting a 75g+ tank, i would really leave it to the experts, or get some glass the same thickness as your tank and practice on that first, one small move and your tank is broke. its not hard too do, but you do need the technic down solid. I have drilled glass before, and a few 10g and small display tanks with 2/3in glass

takes time, and I use a drill press when i drill, less room for error, some people charge about $45-$50 to drill each hole, but none are insured, unless you buy a tank pre-drilled (usaly why its high priced) there is no garentee.

and if you decied you still want to drill the tank, buy a good dimond carbide bit, $75-$300 (depending on size) anything less will get you about two good holes, and no practice holes, so if you use up your two practice then go to drill your tank, you have no more dimond dust, and you just scratch the tank, or shater it.

hope this helps, and informs you about the risk and dangers involved, I'm not saying don't do it, but try to make an informed desision.
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Old 02-02-2011, 08:48 AM   #5
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Go to www.glass-holes.com they have overflow kits that come with the hole saws, overflow, and elbows needed. They also have some videos on there site, but plenty of videos on you tube as well. You can use plumbers putty to make the ring around the work area to hold water while drilling. Use a cordless drill they are much better for low speed control. Which you will need for this! I used one of their kits for my current set up, which is a 75 gal. And all went great and love the overflow...very small footprint in tank.
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Old 02-02-2011, 09:05 AM   #6
Geoff
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i put 7 holes in the back of my 125. not that hard. just get the diamond hole saw, a corded drill, and somebody to spray water on it while you drill.

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Old 02-02-2011, 09:29 AM   #7
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Thicker glass is actually much easier IME.

I like to cut a piece of plywood with the same diameter hole, clamp it to the glass and use it as a template for drilling. This way the bit won't wobble and you end up with a nice clean hole.

Check here for my process, use lots of water to keep the bits cool under higher revs.
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Old 02-02-2011, 09:33 AM   #8
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Thicker glass is actually much easier IME.

I like to cut a piece of plywood with the same diameter hole, clamp it to the glass and use it as a template for drilling. This way the bit won't wobble and you end up with a nice clean hole.

Check here for my process, use lots of water to keep the bits cool under higher revs.

that worked out good for you there!
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Old 02-02-2011, 03:20 PM   #9
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Originally Posted by Geoff View Post
i put 7 holes in the back of my 125. not that hard. just get the diamond hole saw, a corded drill, and somebody to spray water on it while you drill.

G~
+1, I watched a local guy here near me drill holes like it nothing... he uses a 5 gallon bucket and an airline hose to siphon the water to the drill
bit the whole time. Need a special bit. And he used a cordless drill
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Old 02-02-2011, 03:34 PM   #10
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i have done it no problem with a cordless drill. it just sucks if you run out of juice and you have to be really, really gentle when you are about to break through or you will chip out. using a corded drill you are just not worried about the power and it is easier to be patient.

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Old 02-02-2011, 06:42 PM   #11
Bobby89
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When I drilled 3 holes in the back of my 110 gal. I used a Diamond tip bit from Glass holes which worked flawless. I made a templet out of wood to align the holes and clamped the hose onto it to give me steady water flow to keep it cool.
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Old 02-03-2011, 02:18 AM   #12
saltlifefan4278
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It's easy give it a shot.. Just as stated don't drill tempered glass, used a diamond bit hole saw, and use water.. Don't force it nice and easy pace..
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Old 02-03-2011, 10:07 PM   #13
reefer_rylan
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Wow, I have been away for a while. This response is overwhelmingly helpful. I am nervous, and not sure I am going to do it yet.

So is there a way to add holes in the back to create an overflow or does it HAVE to be in the bottom? (I ask just in case the bottom is tempered glass) Could I use a 90 degree angle or would that create problems with detritus?
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Old 02-07-2011, 02:15 PM   #14
sha_ggy13
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Quote:
Originally Posted by reefer_rylan View Post
Wow, I have been away for a while. This response is overwhelmingly helpful. I am nervous, and not sure I am going to do it yet.

So is there a way to add holes in the back to create an overflow or does it HAVE to be in the bottom? (I ask just in case the bottom is tempered glass) Could I use a 90 degree angle or would that create problems with detritus?
I would be very hesitant to drill the bottom of a tank unless you are 100% sure the bottom is not tempered. A lot of the reef ready tanks are drilled in the back and yes they use 90 degree plumbing to route the water.
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Old 02-07-2011, 02:22 PM   #15
deanp88
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Quote:
Originally Posted by wharyat View Post
Thicker glass is actually much easier IME.

I like to cut a piece of plywood with the same diameter hole, clamp it to the glass and use it as a template for drilling. This way the bit won't wobble and you end up with a nice clean hole.

Check here for my process, use lots of water to keep the bits cool under higher revs.
+1. I used thin plywood and taped it into place to start the hole. Works great.
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