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Discussion Starter · #1 ·
Finally talked the Wife into letting me start my first Plywood Build :dancing:

I have 2 kids and a second job so I can't promise much in the way of speed on this but I started my 300 build tonight. My ultimate goal is to use this tank as a learning curve to build an 870 gallon.

Last night I managed to procure the Plywood (forgot one sheet :( )

Tonight I started on Gluing pieces together as I am not using 2x4 structure on this one. I only managed to get the back piece glued up at this point hoping to get all the cuts for the sides done tomorrow so I can work on it later than I could tonight (4 yr old early bed. Light sleeper etc)

Here's what I managed:

Glue on the First Sheet


Clamped and screwed the second sheet to the first (note the foreman in the window)








Feedback??
 

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Discussion Starter · #4 ·
Well got a little further tonight. Here's a pic or three

for reference, a shot of the back of the tank against my tv stand. tv is a 42".



Getting ready to put the back up.



I really screwed up in gluing both pieces together before getting them secured to the tank. 1.5" of plywood is much more difficult to bend than 3/4" plywood. It has a slight bow from sitting in the pile and that bow is proving difficult to deal with at this point. Luckily a friend contacted me to see where I'm at and hopefully before end of tonight I'll have a photo of the back and at least one side.
 

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Discussion Starter · #5 ·
What a task getting that 1 1/2" plywood into place... it was NOT easy. I'm whoooped. Got it into place though I'm happy overall but its not as precise as I usually accept. I broke 2 clamps trying to force things into place. I have to deal with a 1/16" out of square tank. Really not pleased with that but it was clearly not going to get any better. Here's a shot of the back in place.

 

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Discussion Starter · #6 ·
Coln said:
Never thought of doing that, looks a good way to go will be following your build :thumb:
Coln glad to have you on board for the journey. I read through your build while I was planning things out. The 1 1/2" Ply I think is a good plan overall but the bowing is definitely something I didn't consider.

Shawn Stone you're right the screws are def. not needed to be honest they were used exclusively to hold the two sheets together while the glue dried. I could def. take them out now but why?
 

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Discussion Starter · #8 ·
Here's tonights work :




And heres a quick sketch of the stand I'm building tomorrow... well the structure anyhow
 

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I hate to tell you, but the bowing is due to the fact that your sheets were not sitting on a flat surface when you glued them. When you laminate two pieces in a bent state, they stay bent.

I use this effect on purpose for laminating scaffolding planks. I bend them a bit and then laminate to introduce a camber. Then when you stand on them they do not sag.

to achieve a flat lamination you need to oppose any cupping in the two sheets and clamp the assembly to a flat surface.

I hope you are planning on euro bracing the top of that tank, otherwise you have a serious point of weakness in the front corners.
 

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Discussion Starter · #10 ·
pistolpete
Yes I know. I realized hours after I glued. Really disappointed in myself on this one. I know better as I am a hobby carpenter. I had some company watching me when this happened and we were talking while I was working and I made a mistake. Fortunately I had planned on bracing from the start anyhow so I can still make it work. To be honest I'm more frustrated with myself than worried at this point I can fix it.
 

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I don't understand. With no framing, what will keep this tank from ripping apart at the seams once there is water in it?
 

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Know need to be frustrated live and learn. I am going to be watching your progress and applauding every step of the way. Good luck.
 

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the tank will not blow apart because glued and screwed joints are immensely strong. Much stronger actually than the silicone holding regular tanks together. The other part of the equation is the box shape of the tank, which provides rigidity. IMO Bigdaddyk is going way overboard with his plywood thickness, 3/4 inch byrch plywood would be enough for this build.

For peace of mind, many people embed glass cloth in the epoxy coating at the corner seams. This makes a plywood tank even more bullet proof.
 

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Discussion Starter · #17 ·
Thnx for the Kind words and constructive advice all.

pistolpete I think u'r prolly right with overkill but i wanna sleep at night and I have a wife that is not 100% behind me on this build. having the "I told you so" has kept me thinking of the possibilities and how to avoid that possiblity
 

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Discussion Starter · #18 ·
Haven't done much for a couple of days. Had Family visiting over the weekend and last night was a recovery night. Hoping to build the Sump's tonight. The way I built the stand dictates that I'll need two sumps I'm thinking about joining them together and having the pump external. I'll try and get a rough sketchup tonight to get input from the experts :)
 

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Discussion Starter · #19 ·
I screwed up bad last night. Against my better judgement I bought and tried to install a piece of pine to pull out the bowing knowing full well that it'd be too weak but due to some $$ "savings" I thought I would try it.

Just so I could make a bad move worse I glued it into place using outdoor wood glue. I gave it approx an hour to set... let the clamps off an the bowing was pretty much as bad as it was before. I worked as fast as I could pulled all the screws and cracked it with a hammer all that did was splinter the pine to toothpicks..... Looks like a night of chiseling and or getting the circular saw out and testing my horizontal cutting skills...
 
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