Blanking Formula
P=L x T x S / 2000
P = Tons   L = Cut Length
T= Material Thickness   S = Material Shear Strength

Energy Estimation Formula

BE = T x Mt x 0.5
BE = Blanking Energy (Inch Tons)    T = Tonnage    Mt = Material Thickness

DE = T x Dl x 0.63
DE = Draw Energy (Inch Tons)   T =  Tonnage Dl = Draw Length

Stripping Formula:   P = 1.7 x L x T
P = Stripping Tonnage   L = Length of Cut T = Material Thickness


Hydraulic Press Speed

T = D x 60 / IPM
T = Time in Seconds    D= Distance of ram travel in inches
IPM = Ram speed in Inches Per Minute

Note:  Add 0.50 seconds for valve shift to total time per stroke.  Then divide the total time into 60 seconds for strokes per minute:  60 / Total time = Strokes Per Minute.


Convenient Information

 
1 inch  = 25.4 mm 1 mm = 0.0394 inches
1 pound = 0.4536 kilograms 1 kilogram = 2.2046 pounds
Circumference = Dia. x 3.1416

Approximate weight in pounds per cubic inch:
Steel = 0.284        Cast Iron =0.259


Material Thickness
Gage
Thickness
8
0.164 "
10
0.135"
12
0.105"
14
0.075"
16
0.060"
18
0.048"
20
0.036"
22
0.030"
Coil weight per inch width of steel
at various OD/ID sizes
 
OD / ID Lbs / Inch
48" / 16"  440
48" / 20" 410
60" / 16"  720
60" / 20"  690
60" / 24" 650
72" / 24"  990

Bending Force in Mild Steel:
Tons per Lineal Foot
Thickness
Tons
0.048"
3.0
0.060"
3.8
0.075"
4.7
0.105"
6.5
0.120"
7.5
0.135"
8.5
0.187"
11.2
0.250"
15.4
0.375"
24.0


Hole Punching Tonnage Chart
for Various Thicknesses of mild steel
Hole Dia 0.060" 0.105" 0.120" 0.187" 0.250"
0.500" 2.4 Tons 4.1 Tons 4.7 Tons 7.4 Tons 9.8 Tons
1.00" 4.7 Tons 8.3 Tons 9.4 Tons 14.8 Tons 19.8 Tons
2.00" 9.4 Tons 16.4 Tons 18.8 Tons 29.5 Tons 39.3 Tons