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A Small, Simple Press Brake
Now that I had the Christensen 40 Ton press fixed up and usable again, I needed to
start assembling some tooling for it. One of the handiest little bits is a press brake,
used for putting a nice sharp bend in sheet and flatbar, for use in brackets and such.
I looked around at some designs, drew up a quick plan for a fairly simple one,
and collected together some materials.
The round bit got drilled and bored to fit the nose of the press ram, and drilled for a locking bolt.
I bandsawed two chunks of the 3/4" hot-rolled and MIG welded 'em to a chunk of spare 3/8" plate,
with a 3/16" gap between 'em. (Designing by the seat of my pants, as it were.) :)
then chain-drilled a notch in the "blade" plate, then milled it square to fit the round piece.
Then, to cut the working edge of the blade, I cranked the mill head over to about 35 degrees
or so, and milled a wide bevel on each side. Why 35 degrees? For an included angle of 70 degrees,
which, you'll note, is more acute than 90 degrees, so I can bend a piece to slightly more than 90,
so when it "springs back" I can have a 90 degree bend.
The blade gets welded to the nose piece...
It worked like a champ the very first try. Took about two or three hours all told,
a big chunk of which was just drilling and boring the nose piece. I haven't tried it to see how thick a
part I can bend or the maximum angle I can do, but so far it works great.
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