Hole location for Herbie for overflow's

Palmer · #1 02-25-2011, 03:48 AM

So I drilled three holes in the tank tonight with the 42 mm diamond saw and wouldnt you know the 1 " bulkheads DONT fit!! It goes right up to the external thread (about a half a cm in) and just stops doesnt seem like anyway to get it through. I wrote BRS an email but honestly all the 1 " bulkheads they sell have the external thread so now I dont know what my options are...

Anyone run into this before?

The hole is pretty clean there really isnt any significant jagged edges....

Palmer

Palmer · #2 02-25-2011, 04:07 AM

It seems under the 42 " diamond saw it says its for 3/4" bulkheads. But from what I could see on the 1 " bulkhead it stated the hole size needed was 42 mm.... You just cant win sometimes... Guess I am stuck with 3/4 returns and herbie drains unless someone can think of something else I can do. You cant drill a bigger hole where the smaller one is can you? Not sure how practical that is and how to trap the water needed for the drilling...

Lance · #3 02-25-2011, 04:09 AM

I just measured a 1" bulkhead I got from J&L and it will just fit a 43mm hole.

Lance · #4 02-25-2011, 04:13 AM

Sorry about that: It is a 3/4" bulkhead, my bad.

Palmer · #5 02-25-2011, 04:20 AM

Yeah I think I am pretty much stuck with going with a smaller bulkhead... It's a 30 G frag tank to be plumbed to my main system. I may just need to limit the flow a bit to the tank....

golf nut · #6 02-25-2011, 05:00 AM

42 mil is 1.65", get a lighter schedule bulkhead.

Delphinus · #7 02-25-2011, 05:22 AM

Are they schedule 40 bulkheads (black) or the schedule 80 (grey I would think)?

Can you post a picture of how far in they go into the hole?

I think you can drill over the holes if need be. You'll need a plant sprayer to spray water as you go instead of the usual trapping-water thing you usually have to do. I've used the spray bottle when drilling holes on glass I couldn't get horizontal like on a tank too big to turn sideways.

No idea how risky it is.

If it's just 1mm short maybe a dremel with diamond bit to grind out the holes to make them large enough?

Or, just use the 3/4" bulkheads but step it up to 1" on either side. Would make for a small restriction but maybe not much worse than a typical 90-degree thing.

Palmer · #8 02-25-2011, 05:27 AM

Quote:

Originally Posted by Delphinus

Are they schedule 40 bulkheads (black) or the schedule 80 (grey I would think)?

Can you post a picture of how far in they go into the hole?

I think you can drill over the holes if need be. You'll need a plant sprayer to spray water as you go instead of the usual trapping-water thing you usually have to do. I've used the spray bottle when drilling holes on glass I couldn't get horizontal like on a tank too big to turn sideways.

No idea how risky it is.

If it's just 1mm short maybe a dremel with diamond bit to grind out the holes to make them large enough?

Or, just use the 3/4" bulkheads but step it up to 1" on either side. Would make for a small restriction but maybe not much worse than a typical 90-degree thing.

Great suggestions

They are the schedule 40 black ones. I think I am going to go with your last suggestion. I have already experienced the whole square peg round hole thing, I think I want to go with the easiest solution. thanks