New Heavy Duty Rolling Shelf

[zoama]

Here's my way of building square frames like the rolling shelves I just made or anywhere you need 90 degree joints.
I take short pieces of 1" angle, cut the ends 45 degrees, clamp them to the table at 90 degrees and weld them together. I like for each side to be at least 10" for plenty of clamping space.
When you're ready to build a frame you just clamp them to your tube or angle and start welding. I fully weld the exposed sides of the joint without tacking, then remove the jig and weld the rest.
The rolling shelves turned out dead square with all four casters screwed in fully.