THK Full-Ball LM Guide Wide Rail

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Balls roll in four rows of raceways precision-ground on an LM rail and an LM block, and endplates incorporated in the LM block allow the balls to circulate. Since retainer plates hold the balls, they do not fall off even if the LM rail is pulled out. (except models HRW 12 and 14LR). Each row of balls is placed at a contact angle of 45 so that the load ratings applied to the LM block are uniform in the four directions (radial, reverse-radial, and lateral directions), enabling the LM Guide to be used in all orientations. In addition, the LM block can receive a well-balanced preload, increasing the rigidity in the four directions while maintaining a constantly low friction coeffi cient. The LM rail is wide and has a low center of gravity with a low overall height, so it can be used as a single axis in locations where space is limited or where high rigidity is required due to moment loads.

Compact with Large Load Capacity


Because of the large number of load-bearing balls, this model is highly rigid in all directions. The LM rail is wide and suffi cient to receive a moment load even in a single rail confi guration. Additionally, since the secondary cross-sectional moment of inertia of the LM rail is large, the rigidity in the lateral directions is also high. Accordingly, it does not need reinforcement such as a side support.

Self-adjustment Capability


The self-adjustment capability through front-to-front configuration of THK’s unique circular-arc grooves (DF set) enables a mounting error to be absorbed even under a preload, thus to achieve highly accurate, smooth straight motion.