THK LM Guide HRW Block

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 rated loads 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 four directions while maintaining a constant, low friction coeffi cient. In a low center of gravity structure with a large rail width and a low overall height, this model can be used in places where space saving isrequired or high rigidity against a moment is required even in a single axis configuration.


[Compact, Heavy Load]
Since the number of effective balls is large, this model is highly rigid in all directions. It can ad equately receive a moment even in a single rail configuration.
Additionally, since the second moment of inertia of the rail is large, the rigidity in the lateral direc tions 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.