It is doable with a press brake on quarter inch or even heavier. Of course
you would not be able to make the complete strip in one piece. I would
guess the revolution might take four pieces, maybe three depending on
radius, width of strip and clearance on the press brake.
To create the layout you will have to do a series of triangles to get
the development. Look up in a sheet metal layout or good drafting text.
Some developments are parallel line, radial lines and the last method is
triangles
Once cut the forming will be a series of hits not parallel to each
other. The tighter bend area will have hit lines closer to each other
compared to the large radius areas. It is not unlike forming spiral shapes.
Randy


"Richard Ferguson" wrote in message
...
I know that one can bend plate in a slip roll or with a press brake.
But how can one put a twist in plate, like taking a strip of plate and
twisting it such that the bottom becomes the top? Is that just a matter
of putting a bend at an odd angle? But how can I get a very different
radius at each end of the bend? With sheet metal, it is pretty easy
with hand tools and jigs.

I confess that I have never even seen a press brake, and have limited
experience with slip rollers.

If you want to know why I want to know, or a picture of the application,
click this link:

http://fergusonsculpture.home.att.net/mobius.html


Richard


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http://www.fergusonsculpture.com
Sculptures in copper and other metals