Ignoramus4546 wrote:
I welded the brackets from 3/16" pieces that I had. Each bracket
is supported by eight 1 5/8" screws, going into the garage ceiling
joist. The bar is held by 3/16" chain.

The bar itself is a military surplus junk "FIXTURE, ENGINE MAIN"
that I did not know what to do with.

http://igor.chudov.com/projects/Pullup-Bar/

i

Is this a piece of gymnastic equipment or am I missing something here?
You weld a few beads, do a few pull-ups, weld some more? :-D

Chris