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
Diameter:	mm
Thickness:	mm
* Strength:	Kg/mm2
Fields marked with * are compulsory. 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