Allowance must be made for this when determining bore size, piston area and lift capacity. ![]() This can happen for several reasons, such as the piping leading to the rod end being too small. This load isn’t normally achievable in practice, however, because of counteracting pressure from the upper side of the piston. If this was 1000 psi, for instance, the maximum lift of your hydraulic cylinder would be 7700 lb. To calculate maximum possible lift you need to know the pressure input from your hydraulic pump in psi. This gives the equation 2, or, as both the ‘2’ and the diameter are squared.įor an 80 mm / 3.14 inch bore, you would have the following piston area:Ī = 7.7 square inches at the piston base. We therefore take the diameter (D) and divide it by two. From an engineering perspective, however, it is difficult to calculate the radius directly. Mathematically, the area of a circular piston can be calculated by, where A is area and r is the radius. if you are using ISO standard hydraulic cylinders) then you can determine piston area size using the following formula: If you already know the bore size of your cylinder (e.g. Pressure is measured in psi, or pounds per square inch, so the size we are most concerned with is the area (in square inches) at the bottom of the piston. The most important measurement when determining size is the amount of pressure on the piston, as this determines the cylinder’s lifting capacity, or force. ![]() The risk of miscalculating the correct size is a cylinder with insufficient strength or not enough speed to carry out its function. It therefore makes sense to work backwards from the capacity required from your cylinder before settling on size. The size, in terms of bore and surface area of a hydraulic cylinder, directly affects the available force and internal pressure – thus determining its potential power output. In the meantime, this quick guide will help you avoid common mistakes and make the order process easier. ![]() Our advice team are all experienced hydraulic engineers and can help you get the right size first time. This is easier to do than it might appear, as many product numbers are similar and some suppliers are unwilling or unable to provide the bespoke advice needed to place the correct order. Ordering the wrong type of hydraulic cylinder can work out expensive.
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