Spindle Jack Sizing
Calculate travel speed, required input torque, or achievable axial force for screw jack gearboxes.
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What do you want to determine?
Formulas
M = (F × Ph) / (2π × i × η)
F = (M × 2π × i × η) / Ph
n = Input speed [min⁻¹]
Ph = Spindle lead [mm]
i = Gear ratio [–]
η = Efficiency [–]
M = Input torque [Nm]
F = Axial force [kN]
Example Calculation
Screw jack gearbox with i = 10, Ph = 5 mm at n = 1,400 min⁻¹:
v = 1,400 × 5 / (10 × 60) ≈ 11.7 mm/s
Note: Efficiency η depends on the gearbox type: trapezoidal lead screw drives are typically η = 0.20–0.35, ball screws η = 0.80–0.95. Spindle lead Ph and gear ratio i can be found in the manufacturer's data sheet.
Notice: The calculation tools provided are intended for initial orientation only and do not replace binding engineering design by qualified specialists. All results must be verified by appropriate engineering calculations before use in safety-critical applications. Technische Antriebselemente GmbH accepts no liability for damages arising from the use of the calculation results.
Have the screw jack designed for your application?
Lifting force and stroke are settled — what becomes critical is buckling, duty cycle and self-locking. Carry your values into the enquiry and we will design the screw jack together with the spindle, the motor and the arrangement for your application.
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