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Design and Theory

Roller profile rail bearings

Roller profile rail bearings are similar to the ball profile rail bearings except using rollers instead of balls bearings. Roller profile rail has lower elastic deformation under load compared to a ball carriage, making it exceptionally rigid.

Roller profile rails provide an even higher level of rigidity than double-backed ball profile rails by using roller bearings instead. Roller profile rails use the equivalent of a back-to-back bearing arrangement, complemented by special rollers that are crowned to prevent roller edge loading when misalignment is present. The result is lower elastic deformation as the load increases compared to a ball carriage or face-to-face bearing arrangement. Roller guides have a higher load capacity than profile rails with ball bearings as a result of the increased contacting surface across the length of the roller, due to the ball’s single point of contact versus a roller’s line contact area. This results in a substantially higher load carrying capacity and lower wear with minimum rolling friction. The cost of this increased precision and rigidity is even less tolerance for installation variance than double-backed ball profile rails.

Roller profile rail bearing cross section

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