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THK Caged Ball LM Guide
Model SSR is capable of receiving loads in four directions: radial, reverse radial and lateral directions.
Its basic dynamic load rating is represented by the symbol in the radial direction indicated in the figure on the right, and the actual value is provided in the specification table*1 for SSR. The values in the reverse radial and lateral directions are obtained from Table1 below.
SSR Outline
Model SSR - Product Overview
With a low mounting height, compact design and a large radial load capacity, this model is optimal for horizontal guides.
Grinding machine / semiconductor manufacturing machine / printed circuit board drilling machine / 3D measuring instrument / chip mounter / medical equipment
Model SSR-XW With this type, the LM block has a smaller width (W) and tapped holes.
Balls roll in four rows of raceways precision-ground on an LM rail and an LM block, and ball cages and endplates incorporated in the LM block allow the balls to circulate.
Use of the ball cage eliminates friction between balls and increases grease retention, thus to achieve low noise, high speed and long-term maintenance-free operation.
● Compact, Radial Type
The compact design with a low sectional height and the ball contact structure at 90°make SSR an optimal model for horizontal guides.
● Superb Planar Running Accuracy
Use of a ball contact structure at 90°in the radial direction reduces displacement in the radial direc-tion under a radial load and achieves highly accurate, smooth straight motion.
● 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.
● Stainless Steel Type also
Available as Standard
A stainless steel type with its LM block, LM rail and balls all made of stainless steel, which is superbly corrosion resistant, is also available as standard
Equivalent Load
When the LM block of model SSR receives a reverse radial direction and a lateral direction simultaneously, the equivalent load is obtained in the equation below.
PE＝X・PL＋Y・PT
PE :Equivalent load | (N) | PL | :Reverse radial load | (N) | ||
PT | :Lateral load | (N) | ||||
Reverse radial direction | ||||||
X, Y:Equivalent factor (see Table 2) | ||||||
Lateral direction | ||||||
Table 2 Equivalent Factor of Model SSR | ||||||
PE | X | Y | ||||
Equivalent load in reverse radial direction | 1.000 | 1.155 | ||||
Equivalent load in lateral direction | 0.866 | 1.000 | ||||
