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Unread 05/09/2011, 09:08 AM   #1
jrpark22000
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Join Date: Nov 2010
Posts: 572
Adjustable Weir Overflow/Skimmer box design

I purchased a great used tank but it only has a single 1.5" bulkhead hole drilled in the tempered back wall .

So my problem is to design an adjustable weir skimmer box that can meet the following criteria.
1) quiet as possible
2) effective surface skimming
3) accommodate different flow rates
4) easy setup and adjusting of water level
5) minimize the chance for snail and fish entry
5) DIY

Next I setting other variables.
1) I want the box to house a 90deg pvc fitting with an intake screen
2) Black Closed Cell acrylic 3/8” stock material
3) overall dimensions 9”high by 3.75” wide by 9” tall

This is what I cam e up with. The acrylic is cut, shipped and should be arriving today.

I’ll use my old Bridgeport J head milling machine to cut the slots.

What are your thoughts?



Last edited by jrpark22000; 05/09/2011 at 09:25 AM.
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Unread 05/09/2011, 09:09 AM   #2
jrpark22000
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Posts: 572
The visio


Attached Images
File Type: jpg adjustable skimmer box.JPG (41.9 KB, 96 views)
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Unread 05/09/2011, 09:18 AM   #3
jrpark22000
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Description;
1) the lid is cut to fit into the assembled box but remain sitting on top
2) The top lip of the box has been machined to have a ¼” slit all the way around for surface skimming
3) The front has ¼” slits cut in 3” long.
4) The adjustable weir plate slides along using the blue slots and secured using the black screws.

The solution to all of my problems, hopefully.

What would you do different or what problems do you see?


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Unread 05/19/2011, 12:14 PM   #4
jrpark22000
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It's finished and installed. I still need to finish the external overflow beananimal, but here is the skimmer box.


Attached Images
File Type: jpg front view.jpg (33.8 KB, 66 views)
File Type: jpg weir plate installed.jpg (31.5 KB, 58 views)
File Type: jpg top view and lid.jpg (29.2 KB, 50 views)
File Type: jpg back view_extension blocks.jpg (31.7 KB, 46 views)
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Unread 05/19/2011, 12:18 PM   #5
jrpark22000
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The rest of the photos.


Attached Images
File Type: jpg back view_bulkhead installed.jpg (31.6 KB, 36 views)
File Type: jpg inside view_recess for bulkhead.jpg (33.4 KB, 37 views)
File Type: jpg inside view_bulkhead installed.jpg (41.0 KB, 36 views)
File Type: jpg installed top view.jpg (36.5 KB, 42 views)
File Type: jpg lid installed_view of surface skimming ledge.jpg (35.7 KB, 41 views)
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Unread 05/19/2011, 12:22 PM   #6
jrpark22000
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It's pretty striaght forward from the photos. The extension blocks are on the back to space the box off the tank back wall. This allows for surface skimming of more water.

The middle spacer block and the overflow box have a hole cut large enough so the bulkhead only seals on the back spacer block. With 1/2" glass, the external 3/8" overflow box and the 3/8" skimmer box I needed to recess the bulkhead to be able to assemble everything.

There is enough room in the skimmer box to thread a 1.5" bulkhead strainer into the bulkhead. Just more protection from fish/inverts from making it into the sump.


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