Presses can exert an unbelievable about of force through the use of hydraulics. Hydraulics are typically measured in pounds per square inch, which is a measurement of pressure, or force exerted with respect to area. To calculate the force used, multiply the pressure measurement by the area measurement in inches. This will give you the force in pounds, which can be easily converted into tons.
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Reference the necessary data, such as psi and cylinder diameter or area. This information should be offered in the hydraulic press's specification sheet.
Calculate the area of the cylinder, if it is not offered on the specification sheet. Use the formula: Area equals 3.14 times the square of the diameter, divided by four. As an example, If the cylinder diameter is 4 inches, then you would multiply 3.14 times 4 inches times 4 inches, divided by 4. Therefore, the area is 12.56 square inches.
Multiply the pressure rating, in psi, by the area. In the example, if the press offered 2,500 psi, then you would multiply 2,500 by 12.56. This gives you 14243 Kilogram.
Divide the number of pounds by 2,000 to convert to tons. In the example, 31,400 divided by 2,000 gives you a force of 15.7 standard tons. If you wish to convert to metric tons, you would divide by 2,205. In the example, 31,400 divided by 2,205 gives you a force of 14.24 metric tons.