A lot came together on this project very well but today I made one really big mistake and discovered another that I made weeks ago.
This is supposed to be a rack to store 8 - 10 Rubbermaid plastic bins. One thing I'm really happy about is that I was able to control welding distortion pretty well. Considering I don't have a proper welding table, it came out very square. The Miller folding table in the pic is not perfectly flat. It's actually slightly convex shaped. I put the shelf frames on four small wood blocks and tried to distribute them evenly. That kept them all on the same plane.
This is one of the shelves ( 14 ga. 1" sq.). The idea is that this will hold two bins side by side stacked 2 high:
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Here's a closeup of one of the welds:
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Here it is primed. I did not weld the joints at the top and bottom. I figured the sides were good enough and I didn't want to have to grind them down on the top where I might put a sheet of something if I feel the need.
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The shelves are one thing but the assembly is way too big for the folding table. I put two 2" sq tubes on saw horses and leveled them with one another. That's the best I could do. Notice that the middle shelf is up against angle brackets and the assembly is oriented with the bottom on the right (more on that in a minute). The angle brackets were really meant to just locate the middle shelf a fixed distance from the bottom. Since I used them, I only tacked the middle shelf in place. The bottom and top shelves are joined on three sides to the verticals.
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Here it is standing up. Fabulous. Almost. In order to make it easier to weld, I rotated the assembly at some point so that the bottom was facing left. But I forgot that and welded the plates for the casters on the right (what should have been the top).
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So, now my shelf supports are above the middle shelf instead of below it. Friggen' brilliant!
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Here are the 3" casters. $16 at tractor supply. The are a bit clunky but they have really good parking brakes.
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The final insult came when I put one of the Rubbermaid bins on a shelf and found that I really didn't need to make the thing as deep as I did. I could have made it about 6" shallower.