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3) Torque converted from thrust
.............................(4)
T: Dive torque (Nmm)
F a: Thrust (N)
ρh: Feed screw lead (mm)
η: Normal efficiency (table2)
4) Calculation of drive torque
Effective diameter: 32mm, lead: 10mm, lead angle: 5°41′ball screw, work mass 500Kg
Friction coefficient of the guide way, normal efficiency
Axial load
Fa=0.003 × 500× 9.8=14.7N
Drive torque
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