Drilling an extra hole

[2pts]

The way I have done it is to predrill a piece of plywood with a wood bit the same size or slightly larger, clamp that piece of plywood to the front with the hole lined up where you want to drill your new hole. It will give your glass hole saw a guide so your not having it spin off and cracking the glass.

Clamp an undrilled piece of plywood to the back of the glass and dont forget the water running on the hole as your drilling.

That said, after reading this thread, I would probably switch the plywood around part way through, and drill from both sides.

Also you need to find out if that pane of glass is tempered, if it is, all this is a no go.

[paddyob]

Originally Posted by 2pts

The way I have done it is to predrill a piece of plywood with a wood bit the same size or slightly larger, clamp that piece of plywood to the front with the hole lined up where you want to drill your new hole. It will give your glass hole saw a guide so your not having it spin off and cracking the glass.

Clamp an undrilled piece of plywood to the back of the glass and dont forget the water running on the hole as your drilling.

That said, after reading this thread, I would probably switch the plywood around part way through, and drill from both sides.

Also you need to find out if that pane of glass is tempered, if it is, all this is a no go.

If the tank was previously drilled... Is it safe to assume not tempered? Already three holes when I bought it used.

Back drilled.

[FishyFishy!]

Originally Posted by paddyob

If the tank was previously drilled... Is it safe to assume not tempered? Already three holes when I bought it used.

Back drilled.

Yeah you're good to go then.

[reefwars]

Originally Posted by FishyFishy!

Yeah you're good to go then.

not necessarily , they drill the holes before tempering the glass .

are the edges polished pat?

[paddyob]

Originally Posted by reefwars

not necessarily , they drill the holes before tempering the glass .

are the edges polished pat?

Not sure what you mean by polished. I thought all tanks were polished. It's not a custom tank or anything.

Is it common to have tempered glass all around? I thought it was usually just the bottom.

[reefwars]

Originally Posted by paddyob

Not sure what you mean by polished. I thought all tanks were polished. It's not a custom tank or anything.

Is it common to have tempered glass all around? I thought it was usually just the bottom.

no not all tanks have polished edges. i doubt they would temper your tank and if they did it would be probably on the bottom panel only.

i also doubt they would temper all panels , cost is too high unless it was to use a smaller thickness in glass.

what company made your tank?