I got the dado structure idea from Ted's Fish Room website. Ted is a freshwater guy who is more handy with the power tools than I am. In fact I only handle the power tools when I am building an aquarium stand.
The first one I built from 2x4s, using roughly twice as much wood as needed, and lots of joist hangers and angle irons as well as 2x4 braces just to keep everything square and standing. It held 4x 20 gallon tanks, it was monster, but it worked for 6 years, and now it's in 2 pieces in my backyard, waiting for bulk pickup (trash) day. This new one I'm making probably uses less wood, but will hold 2.5 times as many 20 gallon tanks, and is going together much more simply and with less cost, even including the six 2x4s I cut crooked, and had to set aside. The first dozen boards cost $24, the next 6, $12, and I already had the screws and porch paint. I'm using outdoor deck screws, 2 inches long, because the drywall screws I've used on other basement stands are rusting shamelessly. These screws won't rust, and if I can manage to avoid painting them, I'll be able to disassemble this rack should we ever need to move it. It's going to be huge...
Anyway, while building it, I frequently wish there was an easier way, because I am not used to such physical labor, and right now there are parts that are aching that I didn't know I had. The other options (premade shelving units) were not flexible enough to give me the space I want, and not cheap. I don't mind paying for labor saving things, but if they don't deliver what I want, I mind.
What I didn't learn in college:
1. Two by Fours are really One and a half by Three and a half, mostly.
2. Some Two by Fours are skinnier than other Two by Fours. If you are using a small piece to test the dado size, make sure it is from the same batch of wood that will be the long beam. Fortunately, my beam piece of lumber was slightly fatter than my test piece, so the beam fit snuggly, or I could shave off a bit of the dado to make it fit snuggly. If it had been narrower than the test piece, it would have fit loosely, and I would have had to make another trip to the lumberyard.
3. I learned "measure it twice, cut once", but nobody told me to "measure it twice, square it twice, cut once". I finished cutting dados in all 6 uprights, only to find that I had cut them all slightly downhill, so the beam could not possibly have set level. And if the beam isn't level, the tanks won't be level. I'll use that wood for something else...
4. When you make several parallel cuts in order to remove material from within a potential dado, one must make sure the cuts are all the way through. (Partial cuts don't leave a nice surface.) Then one can knock the bits out with a hammer, and that works more cleanly than a chizel. It's kinda fun.
5. 19 year old sons are wonderfully helpful.
Surveying the splinters and cuts on my hands, and the sore muscles EVERYWHERE, I would say I've had a fairly productive day. All dados are cut and square. It took just a little while to assemble one side using 3 uprights and 2 beams. I laid them out on the floor of the garage, and set the 20 gallon aquariums alongside the uprights to gauge how much room to allow on the beams for them. I left about a quarter to an eigth inch between each tank and between each tank and upright, as a little wiggle room can be a great thing. Then we discovered the beam didn't fit the dados, and had to do a little shaving of the dado, until we could bang the beam into place in the dado with a hammer. The second beam went in more easily, but was still snug. We drilled 2 holes in each junction, and screwed in the deck screws without stripping even one!
Tomorrow we finish the other side, cut the cross pieces (6) and paint everything, except the screw heads. When dry, finish the assembly, in place, in the basement.
<message edited by KathyL on Wednesday, January 4, 2012 6:31 AM>