Drilling holes in glass

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Drilling holes in glass

Postby dennysfishroom » Sat Sep 23, 2017 8:41 pm

What do you think my are my odds of successfully drilling the bottoms of 40 gallon breeders. The tanks are probably 20-30 years old, and already have a smaller hole drilled in the bottom. I was thinking of drilling a bigger hole right over the top of the present holes.

Also wondering if you think I can get one of the inexpensive diamond hole saw bits to drill 4-6 holes. Probably thinking about 2 inch diameter.

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Re: Drilling holes in glass

Postby sskruzr » Sun Sep 24, 2017 8:56 am

Well, if you dont already, you'll need a jig to hold the bit in place and keep putting water on it to keep it cool. I'm planning on drilling 4 or 5 5.5gallon tanks and setting an auto water change system
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Re: Drilling holes in glass

Postby dennysfishroom » Sun Sep 24, 2017 1:37 pm

One fear I have is that the bottom may be tempered glass. I've got a jig to hold the drill, and have a drill bit for 3/4" PVC pipe, but want to convert to inch and a half PVC. I may want to drill new holes and just patch the old ones, too. Denny
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Re: Drilling holes in glass

Postby mewickham » Sun Sep 24, 2017 3:28 pm

If the tanks already have a hole drilled, they are not tempered glass. It is safe to drill another hole. Also, 40 BR tanks are typically made with plate glass, so that they can be drilled-- since drilling is common practice in breeder setups.
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Re: Drilling holes in glass

Postby sskruzr » Sun Sep 24, 2017 9:12 pm

mewickham wrote:If the tanks already have a hole drilled, they are not tempered glass. It is safe to drill another hole. Also, 40 BR tanks are typically made with plate glass, so that they can be drilled-- since drilling is common practice in breeder setups.

Not neccessarily true. You can order glass with a hole tempered, I did it years ago for my brother. T
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Re: Drilling holes in glass

Postby dennysfishroom » Mon Sep 25, 2017 8:25 am

Is there any way to tell without sacrificing a tank to experiment? I've got 6 of them, but will only need 4 at the most.
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Re: Drilling holes in glass

Postby sskruzr » Mon Sep 25, 2017 12:16 pm

Arent they All-Glass/Aqueon tanks? Or maybe Perfecto? Check their website. Maybe they have the specs. Anyway to tell the thickness of the bottom? Im pretty sure if its thicker than a quarter inch, its not tempered.
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Re: Drilling holes in glass

Postby dennysfishroom » Mon Sep 25, 2017 12:22 pm

I'm guessing these tanks are at least 30 years old. I'm not sure when they started to use tempered glass, but it may have been later than that. Denny
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Re: Drilling holes in glass

Postby sskruzr » Mon Oct 02, 2017 6:57 pm

Are the sides quarter inch or thicker? I remembered tempered glass in 55s and 45highs. There was always a tag saying "DO NOT DRILL, TEMPERED GLASS". I would think if the bottom is quarter inch its tempered. Now we just took the frame off a 125 mega flow Aqueon, and I couldn't believe it, but it was quarter inch tempered.
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Re: Drilling holes in glass

Postby dennysfishroom » Mon Oct 02, 2017 7:09 pm

We'll have to look once I empty the tanks. If I move pretty quickly, I'll have quite a few aquariums to get rid of. Then I'll have to figure out what my new set up will be. Denny
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Re: Drilling holes in glass

Postby gladmaker » Tue Oct 03, 2017 12:01 pm

My 55 gal has the tag that says "tempered". The 1/4" reference - does that mean that if it's more than 1/4" it's not tempered?
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Re: Drilling holes in glass

Postby sskruzr » Tue Oct 03, 2017 9:19 pm

gladmaker wrote:My 55 gal has the tag that says "tempered". The 1/4" reference - does that mean that if it's more than 1/4" it's not tempered?

On a 40 gallon, and the glass is thicker than 1/4", I'd say it isn't tempered.
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Re: Drilling holes in glass

Postby tboy » Thu Oct 05, 2017 12:11 pm

Dont know if this helps.
Tempered glass.jpg
Tempered glass.jpg (21.9 KiB) Viewed 61 times
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Re: Drilling holes in glass

Postby sskruzr » Thu Oct 05, 2017 7:48 pm

I dont so because the tempered fronts of the all-glass weren't rounded like that
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