1. Size the Load
Convert peak, continuous, and shock loads into an equivalent load model with life and safety-factor assumptions.
Proper sizing is critical for actuator longevity. Use this guide to prepare the force, stroke, speed, duty-cycle, life, and integration details our engineering team needs to recommend a suitable direct-drive or planetary roller screw actuator.
Load Model
Peak, RMS, shock, and holding loads.
Motion Profile
Stroke, velocity, acceleration, and dwell time.
Integration Risk
Mounting, brake, sensor, IP rating, and service access.
The L10 life represents the theoretical distance the actuator can travel before 10% of a given population shows signs of metal fatigue. It is heavily dependent on the Dynamic Load Rating (C) and the applied Equivalent Load (Fm).
* Roller screws often exhibit an exponent of 10/3 instead of 3 (standard for ball screws), which is why their theoretical life is dramatically higher under identical loads.
Heat dissipation is the primary limiting factor in high duty cycle applications like servo presses. Planetary roller screws can support demanding duty profiles, but ambient temperature, lubrication, heat rejection, and servo motor holding current must be accounted for. We recommend providing a complete motion profile (Force vs. Time and Velocity vs. Time) for a rigorous thermal analysis.
The fastest sizing review starts with the failure mode of the current axis: low life, low stiffness, hydraulic maintenance, tight envelope, or missing process data. The actuator architecture should follow that constraint rather than a catalog part number.
| Buyer Constraint | Likely Architecture | Check Before RFQ Freeze |
|---|---|---|
| Ball screw life or stiffness is insufficient | Planetary roller screw actuator | Equivalent load, duty cycle, preload, lead accuracy, and thermal margin. |
| Hydraulic cylinder replacement | High-force electromechanical actuator or servo electric cylinder | Peak shock load, envelope, speed, brake holding, and safety behavior. |
| Press or joining data is required | Servo electric cylinder with load-cell option | Force-displacement curve, controller interface, frame stiffness, and calibration plan. |
| Envelope and weight are the main limits | Compact or custom roller screw actuator | STEP envelope, cable routing, heat path, brake strategy, and pilot-batch manufacturability. |
Convert peak, continuous, and shock loads into an equivalent load model with life and safety-factor assumptions.
Confirm motor, brake, encoder, mounting, anti-rotation, rod end, sensor, IP rating, and service access.
Agree first-article inspection, load testing, cycle testing, and outgoing records before sample approval.
If your team already has a duty cycle, drawing, or reference actuator, send it through the contact / RFQ page. If the architecture is still open, compare the product families first and include the uncertain assumptions in the message.
To help our engineers provide an accurate quote and DFM review, please prepare the following information before contacting us:
Inquiry Email
Include force, stroke, speed, duty cycle, life target, quantity, and delivery country.
Send actuator specs to [email protected] or WhatsApp +86 18857971991 for an engineering review.