Mahr | MarMotion Rotary Stroke Bearings

Rotary stroke bearings with a sense of precision

High-precision rotary stroke bearings with experience and innovation: universal guide elements for rotational and linear movements in many industrial sectors.

MarMotion | Rotary Stroke Bearings

Backlash-free linear and rotary movements

Precise and reliable: The precision guides made of hardened steel master movements at the highest repeatability with minimal maintenance work, and a long service life. This optimizes costs and production processes. Machines and equipment are more reliable and efficient.

MarMotion Maschinenbau

Rotary stroke bearings for machine building

MarMotion rotary stroke bearings achieve robustness and durability in numerous applications with their low maintenance requirements even under difficult environmental conditions. Closed designs with sealing rings or wiper seals are used. This results in innovative, new designs for challenging applications in the automation sector, machine tools, packaging machines or bottling plants. Adapted designs ensure that the requirements of the food industry are also met.

Mahr offers you more than just a product.

Our expertise creates benefits in the automotive industry, mechanical and electrical engineering, as well as in medical technology, optics or aerospace. Our solutions speak the language of many branches of industry, the language of quality, safety and sustainability.

MarMotion Präzisionslager

Precision bearings for electronics manufacturing, precision engineering and optics

The rotary stroke bearing combines precision and rigidity in a unique way with compact dimensions. A special mini-range is available. Selected materials that enable the use in a vacuum or cleanroom are available upon request. Dry running is also possible in many of the applications. MarMotion rotary stroke bearings provide outstanding services in optics for microscopes, beam control systems in laser technology or pick-and-place systems in the electronics and semiconductor production. This is where the Mahr rotary stroke bearing demonstrates its strengths.

 

MarMotion | Design and function

Features

Maximum guiding accuracy

The MarMotion rotary stroke bearings offer a very high level of guiding accuracy for linear and rotary movements. This is achieved by finely machined surfaces of the guide shaft and guide bush, for which the form accuracy in terms of roundness and cylindricity is within 1/3 of ISO tolerance class IT 3, as well as by only using steel balls in quality grade 5, type N in accordance with DIN 5401 or ISO 3290.

Backlash-free movements

The gap between the guide bush and guide shaft is a few µm smaller than the diameter of the balls, so that the balls deflect slightly. The preloaded balls roll without slip between the guide shaft and guide bush and ensure that the guide is free of backlash. The optimum preload is set at the factory by pairing of the guide shaft, ball cage, and guide bush. This simplifies the installation of the bearing.

Smooth running

MarMotion rotary stroke bearings enable the highest guiding accuracy in combination with extremely low friction. A slip-free rolling movement of the balls on finely machined surfaces results in very low friction values and ensures smoothest, stick-slip-free motions.

High load capacity and guide rigidity

The dense ball arrangement and the high form and dimensional accuracy of the balls and running surfaces of the MarMotion ball-bearing guide ensure a large number of bearing points and thus an even distribution of forces in the guide. The design engineer can make optimum use of the available installation space. The functional safety of the guide is significantly increased.

Fast movements, high accelerations

Fast movements with high accelerations are possible due to the frictional rolling process at the lowest friction values in the MarMotion ball-bearing guide. Due to their low mass forces, plastic cages are particularly suitable for high-frequency rotational and linear movements. 

Long service life

The MarMotion ball-bearing guide can be described as virtually wear-free thanks to the careful selection and heat treatment of the materials and the manufacture of the highest quality running surfaces.

Low maintenance

In most cases, a thin lubricating film of roller bearing grease suffices for months of continuous operation. The amount of maintenance work required during operation is minimal.

Exchange and replacement

In all individual parts, the high-precision production of the guide shaft and guide bush, the exclusive use of grade N balls, and a continuous quality assurance system ensure the interchangeability of the ball-bearing guide. Permanent fault-free operation is guaranteed. 

Special version

The very extensive catalog range of the MarMotion ball-bearing guide offers suitable solutions for use in many different application areas. In addition, special versions can be produced for specific applications and to meet particular requirements based on a workpiece drawing. Further options are available using alternative materials.

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