Punching capacities calculator (diameter)
POT. = (p x e x sT)/1000
TONNAGE = perimeter x thickness x strength
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.
CAUTION: Never punch a diameter smaller than the material thickness
Select a shape and enter measurements:
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.
Resistance is a compulsory field.
Example: for a given diameter, thickness and strength*, work out the tonnage.
Usual material strengths:
| Low carbon steel | 38 kg./mm2 |
| Mild steel | 45 kg./mm2 |
| Stainless steel | 85 kg./mm2 |
| Copper | 22 kg./mm2 |
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 | |