Free preliminary sizing tool
Linear actuator force and screw torque calculator
Estimate one upward-motion load case, screw torque, screw speed and mechanical output power. Prepare the figures for an actuator selection enquiry.
No registration is needed to calculate. Review the method, assumptions and worked example before using the figures.
Enter your calculation inputs
The initial values are an illustrative example. Replace them with your application figures. Calculations run in your browser and do not contact an AI service.
Method and assumptions
F = m(a + g sinθ) + F_process + F_friction; T_screw = F × lead / (2π × η)
This simplified load case assumes motion and acceleration up an incline, with process and friction forces opposing motion. Use 0° for horizontal and 90° for vertical upward travel. Screw lead and speed are entered in mm/revolution and mm/s; the calculation converts to SI units. Include every mass moved by this axis.
Illustrative worked example
Illustrative horizontal load: 10 kg, 1 m/s² acceleration, 100 N opposing process force, 0 N friction, 5 mm lead, 90% efficiency and 100 mm/s gives 110 N, about 0.0973 Nm screw torque, 1,200 rpm and 11 W mechanical output. Rotating inertia and additional losses remain to be assessed.
What the result does not establish
This is one motoring load case, not complete actuator sizing. It excludes rotating inertia, deceleration, backdriving, side loads, buckling, critical speed, screw/bearing life, thermal duty and machine safety. Calculated screw torque is before any motor gearbox. Check every move and dwell separately.
These are general preliminary calculations, not an engineer-approved design, customer case study or product recommendation. Use the exact manufacturer's ratings and installation conditions for final selection.
Tolomatic: screw selection and torque relationship · Complete actuator sizing guide
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Servo RMS torque calculator
Calculate time-weighted RMS torque, peak magnitude and cycle time from torque-and-time segments. Carry the figures into a motor sizing enquiry.
Gearbox ratio, torque and inertia calculator
Estimate output torque and speed through reduction gearing, plus load inertia reflected to the motor. Check assumptions before choosing a gearbox.
Technical resources and checklists · Content and calculation policy
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