Can a roller screw be easily integrated into existing linear drives or linear axes?

Yes, but integration requires careful review of the guidance, bearing arrangements, and mounting conditions. Accuracy, available space, and proper design and installation are critical for long-term performance.

How can I influence the service life of a roller screw?

Service life depends on axial and radial loads, lubrication, environmental conditions, and the guidance system. Proper maintenance, clean installation, and the use of suitable lubricants are key factors.

What are the maintenance requirements compared to conventional lead screws?

Roller screws are more robust and generally require less frequent maintenance. However, regular inspection, lubrication, and bearing checks remain necessary.

Which lubricants are suitable for roller screws?

High-pressure greases based on lithium or PTFE are recommended. For high-speed applications, an oil circulation system with controlled viscosity may be beneficial. Unsuitable lubricants can increase friction and shorten service life. PGM Motion provides factory greasing according to DIN 51825 and optional re-lubrication systems.

How does temperature affect the accuracy of a roller screw?

Temperature changes impact thermal expansion and, consequently, positioning accuracy. For continuous operation, stable ambient temperature and thermally adapted bearings are important. For applications above 60 °C, spindles with specialized materials or coated rollers help compensate thermal growth.

Are there special coatings or materials to increase service life?

Yes. For harsh environments or humid conditions, options include hard chrome or DLC coatings to reduce wear, stainless steel variants for corrosive environments, and ceramic-coated rollers for high-speed applications. These measures can extend service life by up to 30 % and reduce maintenance costs.

How can I improve the energy efficiency of a roller screw drive?

Efficiency depends on mechanical efficiency, lubrication, and preload. Optimizations include reducing unnecessary preload, choosing a low-friction spindle profile, and using lighter components or friction-optimized seals. A well-designed roller screw can consume up to 25 % less energy than comparable ball screw systems.

How do roller screws differ from electromechanical spindles?

Electromechanical spindles integrate motor, bearings, and drive into a single unit, whereas roller screws are mechanical converters that are combined separately with motors. Roller screws offer higher modularity, greater load capacity, and better suitability for precise linear motion, while electromechanical systems are more suited to compact plug-and-play solutions.

Roller Screws: High-performance drives for limited installation space and high forces

When very large forces must be transmitted or installation space is limited, roller screws will be used. These specialized drive units offer extremely high power density within a compact design. With significantly higher load capacities than conventional screw systems, they provide reliable solutions for demanding applications in mechanical engineering, linear drives, and linear motion systems.

Our roller screws, including planetary roller screws and satellite roller screws, are ideal for applications where maximum force must be delivered within minimal space. Whether used as part of a compact drive module or as a central lifting mechanism in production machinery, they deliver maximum efficiency and long service life.

Technology & Key Features of Roller Screws

Roller contact instead of ball contact: Unlike ball screws, roller screws use rollers instead of balls, which significantly increases load capacity and overall strength
Compact form factor: Their high power density allows the design of axes where installation space is limited, for example in gantry axes, thrust modules, or automated systems
Integration into linear axes & linear drives: Roller screws can be seamlessly integrated into mechanical guide systems, forming a powerful combination of drive and motion control
High load capacity & long service life: Thanks to the rolling element design, both static and dynamic load capacities increase, making them ideal for applications with high loads and continuous operation

How to choose between a planetary roller screw and a satellite roller screw

Planetary Roller Screws – for Maximum Rigidity
- In a planetary roller screw, several rollers rotate evenly around a central shaft.
- This design is ideal for high axial loads, long strokes, and precise linear motion at constant rotational speeds.
- It offers smooth operation, extremely high load capacities, and excellent durability, making it particularly suitable for machine tools, test benches, and CNC applications where precision and long service life are critical.
Satellite Roller Screws – Compact and Dynamic
- A satellite roller screw is the preferred choice when limited installation space and high rotational speeds are deciding factors.
- In this design, the individual roller elements are arranged as satellites around the screw, creating a compact and powerful drive system that operates efficiently even at very high dynamics.
- This variant is commonly used in compact linear drives, robotic axes, and high-performance assemblies where space efficiency and high power density are more important than maximum rigidity.

In summary:
A planetary roller screw is ideal for maximum precision, load capacity, and rigidity, while a satellite roller screw is optimized for compact designs, high speeds, and highly dynamic applications.

Reasons for using roller screws

Maximum force in a compact design
When conventional ball or lead screws reach their limits, roller screws provide a high-performance alternative.
High load capacity with continuous operation
Particularly efficient in drive systems and heavy-load axes of production machinery.
High precision & repeatability
In systems with linear axes or linear drives, they deliver stable motion without compromise.
Reduced maintenance
Robust construction and high stiffness minimize wear and downtime, an advantage for modern production lines.
Versatile applications in mechanical engineering
Whether in machine tools, robotic axes, or modular assemblies, roller screws excel across many fields.

Applications areas at a Glance

Machine tools requiring high stroke and force
Linear drives in handling, assembly, or testing systems
Linear axes in gantry or transport systems
Modular high-performance drives for standard and custom machinery
Applications with Limited Space but high load transmission

Find the Right Solution Now:
Our engineering team assists you in sizing roller screws, including CAD models, life expectancy calculations, and comparisons of different designs.
Contact us today or download the catalog.

FAQ – Frequently Asked Questions about Roller Screws

Can a roller screw be easily integrated into existing linear drives or linear axes?
Yes, but integration requires careful review of the guidance, bearing arrangements, and mounting conditions. Accuracy, available space, and proper design and installation are critical for long-term performance.
How can I influence the service life of a roller screw?
Service life depends on axial and radial loads, lubrication, environmental conditions, and the guidance system. Proper maintenance, clean installation, and the use of suitable lubricants are key factors.
What are the maintenance requirements compared to conventional lead screws?
Roller screws are more robust and generally require less frequent maintenance. However, regular inspection, lubrication, and bearing checks remain necessary.
Which lubricants are suitable for roller screws?
High-pressure greases based on lithium or PTFE are recommended. For high-speed applications, an oil circulation system with controlled viscosity may be beneficial. Unsuitable lubricants can increase friction and shorten service life. PGM Motion provides factory greasing according to DIN 51825 and optional re-lubrication systems.
How does temperature affect the accuracy of a roller screw?
Temperature changes impact thermal expansion and, consequently, positioning accuracy. For continuous operation, stable ambient temperature and thermally adapted bearings are important. For applications above 60 °C, spindles with specialized materials or coated rollers help compensate thermal growth.
Are there special coatings or materials to increase service life?
Yes. For harsh environments or humid conditions, options include:

Hard chrome or DLC coatings to reduce wear
Stainless steel variants for corrosive environments
Ceramic-coated rollers for high-speed applications
- These measures can extend service life by up to 30 % and reduce maintenance costs.

How can I improve the energy efficiency of a roller screw drive?
Efficiency depends on mechanical efficiency, lubrication, and preload. Optimizations include:

Reducing unnecessary preload
Choosing a low-friction spindle profile
Using lighter components or friction-optimized seals

A well-designed roller screw can consume up to 25 % less energy than comparable ball screw systems.

How do roller screws differ from electromechanical spindles?
Electromechanical spindles integrate motor, bearings, and drive into a single unit, whereas roller screws are mechanical converters that are combined separately with motors. Roller screws offer higher modularity, greater load capacity, and better suitability for precise linear motion, while electromechanical systems are more suited to compact plug-and-play solutions.