Full-Ball Type LM Guide Super-heavy load for Machine Tools Model NRS-X / NRS
This model is an ultra-heavy type of LM Guide that achieves a deep grooved raceway with its diameter more approximate to the ball diameter than the conventional type and has high rigidity, vibration and shock resistance, and damping characteristics, which are required for machine tools.
Size : 25,30,35,45,55,65,75,85,100
Types
Highlight feature tags
- Flange
- Long block LM Guide
- Bolts mounted from above and below
- Bolts mounted from above
- Bolts mounted from below
- Bolts mounted from above
Basic load rating (kN): Basic dynamic load rating 28.4 to 376 / Basic static load rating 52.2 to 737
Size :
25,30,35,45,55,65,75,85,100
- Long block LM Guide
- Bolts mounted from above
Basic load rating (kN): Basic dynamic load rating 34.7 to 470 / Basic static load rating 69.6 to 920
Size :
25,30,35,45,55,65,75,85,100
- Flange
- Bolts mounted from above and below
Basic load rating (kN): Basic dynamic load rating 28.4 to 159.8 / Basic static load rating 52.2 to 269.4
Size :
25,30,35,45,55,65
- Flange
- Long block LM Guide
- Bolts mounted from above and below
Basic load rating (kN): Basic dynamic load rating 34.7 to 206 / Basic static load rating 69.6 to 387.2
Size :
25,30,35,45,55,65
- Flange
- Bolts mounted from above
Basic load rating (kN): Basic dynamic load rating 212 to 376 / Basic static load rating 431 to 737
Size :
75,85,100
- Flange
- Long block LM Guide
- Bolts mounted from above
Basic load rating (kN): Basic dynamic load rating 278 to 470 / Basic static load rating 566 to 920
Size :
75,85,100
- Flange
- Bolts mounted from below
Basic load rating (kN): Basic dynamic load rating 212 to 376 / Basic static load rating 431 to 737
Size :
75,85,100
- Flange
- Long block LM Guide
- Bolts mounted from below
Basic load rating (kN): Basic dynamic load rating 278 to 470 / Basic static load rating 566 to 920
Size :
75,85,100
Features
Structure and Features
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. The raceways are cut into deep grooves that have a radius closer to that of the balls than in the conventional design, using special equipment and an extremely precise cutting technique. This design allows high rigidity, high vibration/impact resistance and high damping capacity, all of which are required for machine tools, thus making these models capable of bearing ultra-heavy loads.
Due to the extremely high rigidity of the LM guides used in models NR-X/NRS-X, the construction does not easily absorb the effects of mounting surface misalignment and installation errors. Where such effects arise, there is a risk of reduced operating life and/or malfunction. Contact THK when considering the use of these products.
Improved Damping Capacity
While the machine tool (equipped with NR or NRS) is not cutting a workpiece during operation, the LM Guide travels normally and smoothly. While the machine tool is cutting the workpiece, the cutting force is applied to the LM Guide to increase and the contact area between the balls and the raceway, allowing an appropriate mixture of rolling and sliding motions to be achieved. Accordingly, the friction resistance is increased and the damping capacity is improved. Since the absolute slip during the rolling and sliding motion is insignificant, it causes little wear and does not affect the service life.
Highly Rational LM Guide
The excessively large differential slip occurring in a Gothic-arch groove does not happen with these models. They smoothly travel and achieve high positioning accuracy during fast feeding. During the cutting operation, appropriate slip occurs according to the cutting load, the rolling resistance is increased and the damping capacity is increased. Thus, models NR and NRS are highly rational LM Guides.
High Rigidity
To increase the rigidity of the LM block and the LM rail, which may deteriorate the overall rigidity of the LM Guide in the reverse radial and lateral directions, THK made full use of FEM to achieve optimal design within the limited dimensional range. THK offers two identically sized models with different characteristics, namely the Radial Type Model NR-X and 4 way Type Model NRS-X. Users can select the model that best suits their specifications.
Ultra-heavy Load
Since the curvature of the raceway is approximated to the ball diameter, the ball contact area under a load is increased and the LM Guide is capable of receiving an ultra-heavy load.
Detailed information for each model number
Dimensional drawing/Dimensional table
THK Online Services
Member-Exclusive Content
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after registering as a member.
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Easy product comparisonsHighlight feature -
Save items for laterreview Favorites feature
Benefit 2: Exclusive content
| Products | Contents |
|---|---|
| LM Guide | LM rail standard lengths and maximum length, tapped-hole type LM rail, frame for LM rail clamps, steel plate for LM rail clamps, etc. |
| Ball Screw | Axial clearance, maximum manufacturing length of shaft, etc. |
| Actuator | Movable part mass, etc. |
Standard Length and Maximum Length of the LM Rail
THK Online Services
Member-Exclusive Content
These contents can be accessed
after registering as a member.
Benefit 1: Useful features
-
Easy product comparisonsHighlight feature
-
Save items for laterreview Favorites feature
Benefit 2: Exclusive content
| Products | Contents |
|---|---|
| LM Guide | LM rail standard lengths and maximum length, tapped-hole type LM rail, frame for LM rail clamps, steel plate for LM rail clamps, etc. |
| Ball Screw | Axial clearance, maximum manufacturing length of shaft, etc. |
| Actuator | Movable part mass, etc. |
