Pressure Calculations

The pressure required to straighten a piece of metal depends on its shape. Below is an approximate formula with a further definition for different shapes.


Where F is the ram force in tons; 6 is a constant; U is ultimate strength of the material in psi; Z is the section modulus (see below); and L is the distance between the straightening blocks in inches.



Example: A 2" diameter shaft, 18" between the blocks, 100,000 psi ultimate strength.