Here is my shop built sheet metal brake. The base is 2" x 3" x 3/8"
wall angle iron x 27" long because that's what I had on hand.
The bending arm is 2" x 2" x 3/8" wall angle
with ball bearing pivots. I used a hex 3/8" x 16 tpi
threaded rod coupler cut in half
and welded in slots in the main angle frame for the
pivot points. Shoulder bolts through ball bearings
into the nuts. The base is welded to 2 pieces of 1 1/2" x 3" x 6" long channel
iron to make it easy to bolt to my welding table when in use and holds
the base up so the C clamps will fit under it for clamping the hold
down bars. Handles formed from 3/8" x 2"
bar stock. I use 2 long throat C clamps for the hold down and
so far it has worked out just fine. I can angle the clamps to
clear longer pieces. I regularly bend 16 ga. about 8" wide with
it with no problems but haven't had the occasion to test wider
pieces. I may add a stiffiner to the bending arm. I used some scrap 1/2"
x 2" channel from telephone company cable rack as
a hold down and have cut several pieces certain lengths