Jack working efficiency, No-load torque and screw lead can be found on specification pages. Please use the following formula to calculate power. P1: Required Input Power n1 ：Input rpm r/min T：Required Input Torque N・m W：Lifting Load N L：Screw Lead (m)
π：Circular Constant 3.14 i：Gear Ratio η：Jack working Efficiency T0：No-load torque V：Screw Shaft Speed m/min
Power Calculations Example for a Single Jack (SJW-025)
SJW-025 machine screw jack has a No-load torque 0.62N.m, 21% working efficiency with high speed gear ratio 6:1. Using 1500 RPM on the input shaft and a 800kg load results in the following power equation.
T=( 800x10x5x0.001)/( 2x3.14x6x0.21)+T0=5.06N.m+0.62N.m=5.68N.m P1=( 5.68x1500)/9550=0.89KW
Power Calculations Example for a 4-Jack System
Find the power required to raise a jack system load of 6000kg, at a speed of 1500mm/min, using four SJW-050 jacks by referencing the Machine Screw Jacks Specifications. The load per jack is 1500kg. 4-Jack System transmission efficiency 85%.
T=( 6000x10x8x0.001)/(2x3.14x6x0.21x0.85)+4T0=71.4N.m+4x1.4N.m=77N.m P1=(77x1125)/9550=9.07KW
