Bending rolls for material 3mm wide



As an experiment I want to form some stainless steel flat strip (2.5x0.7mm)
into rings about 80mm diameter. Commercial bending rolls seem like overkill
and I thought about a Hemmingway kit although even that copes with 10" wide
material.

I fixed three small ballraces to a baseplate and pulled some strip through,
it bends the strip but the curvature varies with the direction of pull, and
obviously the pulled end gets pulled straight somewhat.

What are the features I need to consider if I want to gear two of the wheels
together and hand crank them. The pinions cannot be larger diameter than the
rolls but if they are smaller they wont mesh. Are there any drawings or
plans online that I could adapt?

Ian Phillips


.



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