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Punching capacities calculator (diameter)

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Please fill in two of the three first fields and get the result for the missing field. Resistance is a compulsory field.

Example: for a given diameter, thickness and strength*, work out the tonnage.

Tonnage Tn
Perimeter mm
Thickness mm
Resistance Kg/mm2
Clear values

CAUTION: Never punch a diameter smaller than the material thickness

Punching capacities calculator

TONNAGE = (perimeter x thickness x strength)/1000
Kgs. = mm. x mm. kg/mm2
Kgs. / 1000 = Tns

Please refer to the below drawing for more information about how to calculate the perimeter (p) of the most common shapes.

Usual material strengths

Mild steel 38 to 52 kg./mm2
Stainless steel 85 kg./mm2
Copper 22 kg./mm2

If the required punching force is higher than the machine’s capacity or material to be punched has a very high resistance (e.g.: stainless steel), it’s convenient to use punches with special shape as shown in the below figure.

Therefore, the force, noise and vibrations are reduced when punching.

Nevertheless, it is very important to apply the correct gap between punch and die.

MATERIAL  % gap
Aluminum 5 %
Copper 7 %
Mild steel (ST37 to 42) 10 %
Mild steel ST52 12 %
Stainless steel 15 %
% material thickness = gap

 

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