Working to the customers’ tolerances for straightness.
This technique is sometimes employed prior to, during, and/or after heat treat processing an item, to keep or make it straight enough to meet the customers’ requirements. The principle of overbending is to apply a load to a piece that is supported on either side of an area that is causing it to have a T.I.R./F.I.M. beyond the customers’ specification. T.I.R. being “total indicator reading” and F.I.M. being “full indicator movement ‘, as read on a digital or dial indicator, while measuring the total variation from highest to lowest gage reading taken at a given location. The applied load flexes the steel to a point of plastic deformation without cosmetic damage or reaching the point of exceeding its ultimate yield strength.