Overall dimensions and technical information are provided solely for informative purposes and may be modified without notice. A|10 End of stroke cushioning capability The function of the end of stroke cushioning is to reduce the kinetic energy generated by movement of the load and to prevent high speed impact between the piston and end caps that could compromise the unit functionality. The use of non-cushioned cylinders is not recomended on high speed applications unless external means of deceleration (such as dampers) are used. The maximum load that can be cushioned depends on the speed of the unit and the cylinder cushioning capacity. The chartbelow shows the values relative to the ISO 15552 series cylinders considering the out stroke movement and a supply pressure of 6 bar. The acceptable values for any diameter are those found below each size line. Rod Bore (mm) Bore (mm) Moving load (Kg) Force (N) bending and compression allowable length (mm) Piston speed (m/sec) Rod Bore (mm) Bore (mm) Moving load (Kg) Force (N) bending and compression allowable length (mm) Piston speed (m/sec) Cylinder sizing In order to properly size a cylinder it is necessary to consider the following parameters: Force generated: calculated in function of the piston area and of the pressure that acts upon it. F= area x pressure (daN) = (cm ) x (bar) The value is theoretical and needs to be reduced by approximately 10-15% in order to compensate for the effects of friction. We must also consider that the force generated during the return stroke (traction) is lower, as the area on which the pressure acts is reduced by the presence of the rod. Weight of the load: the force generated by the cylinder must be sufficient to move the load in the desired direction within the specified time (cycle time). The load ratio (RdC) must not exceed 70%. Needed force (load weight) x 100 = RdC Available force (generated) APPENDIX A Appendix Dimensioning Solutions for pneumatic automation General Catalogue
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