FMB turntable bearing
Lower costs by using the rotary table bearing FMB. The compact designed FMB table bearing has been developed for high precision rotary motion. It reduces the cost compared to other rotary bearings since fewer components with less tolerance are used necessary for installation offering easy installation of the bearings and reducing the overall costs.
The flat-mounted turntable bearing FMB consist of 3 main parts
• the inner ring;
• an outer ring;
• and a cage fitted with high-precision balls.
The turntable bearing can handle axial, radial, and a combination of loads. The main advantages of this bearing are the low height, easy mounting, and high precision run-out.
Excellent running properties
The super-precision balls move on highly accurate finished ways. The balls have 4 points of contact per ball offering very low, uniform, and smooth friction. As the bearings are preloaded by delivery they move with very high precision and repeatability. Values starting at 10 microns down to 1 micron can be achieved and wobble from 6 µrad down to 2 µrad.
Assembly of a turntable bearing
High-performance ball cage
The PTFE Teflon ball cages keep the precision balls separated, holds the bearing together, and offer smooth running performance. In case of light contaminants, the balls are self-cleaning due to the 4-point contact of balls the contaminant is pushed outside through the contact line of the balls on the raceway.
Easy installation
FMB turntable bearings include attachment holes to a standard configuration to attach the bearing fast and easy. The countersunk treaded holes can be used from attachment from the top and attachment from the bottom side.
Space-saving design
A great advance compared to other turntable designs is the compact design with just 8 mm in height. It replaces bearings from other manufacturers while using double contact bearings. This results in space savings and makes the FMB the bearing of choice for major OEM customers.
High load capacity — play-free
Based on the groove geometry, specially designed raceways offer a greater contact surface for the bearing balls. This allows high rigidity, load ratings, and precise running. The smallest turntable bearing with an outside diameter of 140 mm offers a dynamic load rating of 6.070N and increased to 20kN for the largest bearing. The turntable bearings are preloaded before delivery by geometric matching and do not need readjustment.
Wide choices in sizes
The precision turntable bearing is available in sizes starting from an outside diameter of 120 to 350 mm. The inner bores start at 40 mm with a thickness of 8.5 mm and go up to 250 mm with a thickness of 12.5 mm.
Customized turntable bearings
As all parts are manufactured in-house PM can respond quickly to specific customer needs. Example are:
• Different materials;
• Different sizes;
• Double row of balls;
• Customized attachment holes;
• Modified load ratings.
Other options could be modified lubrication, customized friction forces, modified holes, cleanroom, and ultra-high vacuum compatibility.
FMB bearing in an assembly.
Applications of use
Due that the turntable combines the advantages of low height, compact size, easy installation with a high running precision they are used in modern applications. Just to name a few:
• Semiconductor industry
• Medical applications
• Optical inspection equipment
• Automation industry
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