The maximum punch force in blanking can be estimated by the equation: force = S t L Where: S = the material shear strength t = the sheet thickness L = the total length of the sheared edge (circumference or perimeter) 1.How would this number change if the rake angle is equal to a 1t change across the width or diameter of the part being sheared? 2. How would this number change if the rake angle were increased to a 3t change across the width or diameter?