The inside corner of a tight bend is a minimum of half the thickness inside
radius. Once you try the get tighter the material deforms and the life of
the die is very limited. If the drilled block was hardened enough to retain
its edge at the exit of the drilled hole the edge would cut heavily into the
My guess is if the unit was made as drawn and used the first couple of
bars would bend and then you would have a fun time trying to take out your
piece after bending.
Also good sheet metal brake operators keep people away from their
machines if there is any intention of bending round stock. Over the years I
have seen a lot of damage to press brake and pan brake dies as a result of
bending round bar. Make up a set of dies intended for that job only.
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