Answer / col rajendran

Punching Pressure (in Tons) = Dia of the hole to be punched
x Thickness of the plate (all in inches)x Pressure constant.

Pressure constant for Steel = 80 and for soft materials
like Brass = 65

Hope this is found useful.

Answer / suhas hinge

punching force or pressure (in newton)= Diameter of hole to be punched* thickness of plate*380

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