9-21-19
Assembling frameHere you can see me using the triangular brackets to hold the vertical posts to the base board.

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This is a slotted aluminum square tube framing, 30x30mm. It's also called T-slotted framing and the great thing about this stuff is that it's modular. You can screw pieces together to make frames and all sorts of things, and move it around too as opposed to a rigid welded frame.
Here, you can see the little threaded metal strip I slid into the tube track. That is what the bolts thread into, and once it tightens to the point where the bolt is pressing up on the tube, it's tight.

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Here you see two of the strips that will go onto the vertical tubing, and the other sides will be bolted to the base board.

This bracket allows me to put another tube at a 90 degree angle, making a horizontal post. I can loosen this whenever I want to adjust the height of the horizontal. In this case, it's a horizontal brace for stiffness of the vertical posts.

Vertical frame is complete.
