Bending Question

I want to bend a piece of 1 1/4"x3/8" hot roll(about 3' long) around a 4' radius. I'm considering bending it cold around a form. Anyone have a rule of thumb about the springback?

This is a home shop project and I only need 4 pcs.
--
Gary Brady
Austin, TX
www.powdercoatoven.4t.com
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