Ballscrew Sizing Calculator
Enter the ballscrew, load, acceleration, and motor-gear parameters to instantly see total force, reflected inertias, screw speed, motor speed, required torque, and power. Send the results to ONX Control engineers to request a custom solution for your application.
Ballscrew Geometry
MechanicalLoad and Motion Profile
DynamicMotor and Gearbox Parameters
DriveSystem Forces
NInertia Values
kg·cm²Kinematic Results
VelocityMotor Sizing
DriveEngineering Expert Insight
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How to Calculate Ballscrew Sizing?
Motor selection in ballscrew systems is not based solely on load weight. Incline, friction, acceleration time, screw lead, screw efficiency, gear ratio, and total reflected inertia must be evaluated together.
When converting a linear load to a rotary system, the total linear force is found first. This force is then converted to rotary torque via screw lead and efficiency. The next step is calculating the required motor torque and power, factoring in gear ratio and gear efficiency.
This calculator by ONX Control brings together force, inertia, screw speed, motor speed, required torque, and power values on a single screen, providing rapid pre-sizing for linear axes, Z-axes, servo presses, pick-and-place, and special machine applications.
Frequently Asked Questions
What is the most critical parameter in ballscrew sizing?
There is no single critical parameter. Lead, total load, acceleration time, and inertia ratio must be evaluated together.
What should the inertia ratio be?
It depends on the application. In servo systems, lower ratios are easier to tune. Ratios above 10 require more careful analysis of system behavior.
Does gearbox efficiency affect motor torque?
Yes. The torque required at the screw is seen by the motor as a higher input torque due to gearbox inefficiency.
Is this tool sufficient for final motor selection?
It is very useful for pre-sizing. However, for the final selection, duty cycle, rigidity, critical screw speed, resonance, braking, and safety factors must also be examined.
ONX Technical Summary
Live linear axis summary