Drilling tank help? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 12-09-2010, 04:16 PM Thread Starter
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Drilling tank help?

Was hoping to get some advice from other people who have drilled tanks. I recently bought these bulkheads:
http://www.aquacave.com/075-bulkheads-sch-80-1269.html
and purchased the recommended drill bit for these bulkheads.

I test drilled two holes on an old junk 10G tank, heres the issue the bulkhead does not fit through the hole. It just barely fits but the threads will not go through and I do not want to force it because I dont want to damage the threads or crack the glass. So I'm just wondering if anyone one else has experienced a tight fit like this and if they had to sand the hole to widen it a bit to make the bulkhead fit? I'm assuming that is what I will have to do but was just looking for others experiences?

Thanks
~Graham

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post #2 of 9 (permalink) Old 12-09-2010, 04:34 PM
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a 1 5/8" bit should fit them. Sounds like maybe you have a 1 1/2 inch bit.
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post #3 of 9 (permalink) Old 12-09-2010, 04:48 PM Thread Starter
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Thats what I ordered was a 1-5/8 (40mm). I figured they would just slip right in but sanding might be in order.

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post #4 of 9 (permalink) Old 12-09-2010, 07:28 PM
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1 5/8 inches is 41 to 42 mm, not 40. I would look for a 42 mm bit.

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post #5 of 9 (permalink) Old 12-09-2010, 07:40 PM
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yup... 1 5/8 is 41.275 mm... A 41 mm or 42 mm hole is required. The Holes are a litter "sloppy" in my experience, but 42 is prob your best bet.
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post #6 of 9 (permalink) Old 12-09-2010, 08:58 PM Thread Starter
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Hmmmm....well isn't that a joke. The site even recommends using a 40mm a little farther down on the page where you buy the bulkheads. Bit of a pain, maybe a complaint will get me a free one shipped.

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post #7 of 9 (permalink) Old 12-09-2010, 09:56 PM
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Glass-holes.com

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post #8 of 9 (permalink) Old 12-09-2010, 11:45 PM Thread Starter
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I checked them out in the past, they don't carry the size I need. Anywho already re-ordered one from China for $9.00 shipped.

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post #9 of 9 (permalink) Old 12-10-2010, 04:05 AM
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The exact thing happened to me as well. I was pretty mad at first, but by spending a few more minutes carefully massaging the hole with the bit, the bulkhead fit in easily.
If you do that, be very careful if you are trying to lean the drill off axis. If you do it too much and it grabs, you can chip the glass easily. It is safer to push the diamond part against the hole. Go slow and keep it wet.
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