LSD Series Low Profile Linear Guide – High-Rigidity Four-Direction Linear Rail

Specification:

LSD Series Low Profile Linear Guide – High-Rigidity Linear Motion Rail

The LSD Series Low Profile Linear Guide is a compact ball-type linear guide developed for precision motion systems that require high rigidity and load capacity within a limited installation height. Its 45° X-shaped raceway configuration provides self-alignment, smooth travel and equal load capacity in four directions.

With square and flange blocks, multiple preload conditions, different accuracy grades, flexible rail-mounting options and several lubrication fittings, the LSD Series is suitable for industrial machines, measuring equipment, robotics and precision automation.

Product Concept

The LSD Series consists of a guide rail, linear block and recirculating steel balls. As the block travels along the rail, the balls roll through precision raceways and circulate through the return passages inside the block.

This rolling-contact structure provides:

1. Low friction.
2. Smooth linear motion.
3. High positioning accuracy.
4. Good repeatability.
5. High rigidity.
6. Compact installation dimensions.
7. Multidirectional load support.

LSD Series Construction

According to the supplied product images, the LSD Series includes:

1. X-shaped guide rail.
2. Square or flange-type linear block.
3. Recirculating steel balls.
4. Integrated ball retainer.
5. Grease nipple.
6. End covers.
7. Oil scrapers.
8. Ball-return covers.
9. Dustproof end structures.
10. Internal lubrication and sealing components.

X-Shaped Raceway Design

The LSD guide rail uses a 45°–45° X-shaped raceway arrangement. Four rows of balls are positioned symmetrically around the rail.

This design allows the guide to support:

1. Downward loads.
2. Upward loads.
3. Loads from both lateral directions.
4. Action and reaction forces.
5. Combined loads during multidirectional movement.

Self-Alignment Capability

The curved X-shaped raceway provides a degree of self-alignment when slight mounting-surface misalignment exists.

This helps:

1. Absorb small installation errors.
2. Reduce uneven ball loading.
3. Maintain stable block movement.
4. Improve smoothness.
5. Preserve positioning accuracy.
6. Minimize binding during travel.

Proper surface preparation and alignment are still required for maximum accuracy and service life.

Low-Profile and High-Rigidity Structure

The combined height of the rail and block is reduced, while the block length is optimized for compact machine design.

The structure provides:

1. High rigidity in a low-profile assembly.
2. A lower center of gravity.
3. Reduced machine height.
4. Good resistance to applied moments.
5. Stable linear motion under load.
6. Additional rigidity when preload is applied.

Precision Steel Balls

The supplied product information specifies steel balls manufactured to ISO 3290 G10 accuracy grade.

These precision balls provide:

1. High roundness.
2. Consistent ball diameter.
3. Good wear resistance.
4. Stable rolling contact.
5. Reduced vibration.
6. Long-term motion accuracy.

Ball-Retainer System

The ball retainer prevents the steel balls from falling out when the block is removed from the guide rail.

Its benefits include:

1. Easier block installation.
2. Reduced ball loss during maintenance.
3. Faster block replacement.
4. Improved assembly convenience.
5. Better interchangeability within the same specification.

Interchangeable Design

Strict manufacturing control keeps the dimensional accuracy of compatible rails and blocks within defined tolerances.

As a result:

1. Blocks can be replaced with compatible rails of the same specification.
2. Preload consistency can be maintained.
3. Accuracy remains stable after correct replacement.
4. Maintenance time is reduced.
5. Spare-part management becomes easier.

The replacement component must match the correct size, block style, preload and accuracy class.

Oil Scraper and Sealing Structure

The LSD Series uses a single-lip oil scraper at the ends of the block. Standard and enhanced dustproof configurations are available.

The scraper helps:

1. Remove contaminants from the rail.
2. Prevent dust from entering the block.
3. Retain lubricant inside the raceways.
4. Reduce premature wear.
5. Extend service intervals.

Dustproof Cover

The dustproof cover features a double-injection molded structure to protect the internal ball-circulation area.

This design helps:

1. Improve sealing at the block ends.
2. Prevent fine particles from entering.
3. Protect steel balls and raceways.
4. Improve reliability in industrial environments.
5. Reduce cleaning and maintenance requirements.

Grease Nipple

A grease nipple or optional lubrication adapter can be fitted to the block for convenient lubrication.

Regular lubrication helps:

1. Maintain a protective oil film.
2. Reduce rolling resistance.
3. Limit heat generation.
4. Reduce raceway wear.
5. Extend guide service life.

Available Rail Sizes

The LSD Series is available in two principal sizes:

1. LSD15: 15 mm rail width.
2. LSD30: model size 30 with an actual rail width of 28 mm.

LSD15 is suitable for compact mechanisms, while LSD30 is intended for larger assemblies requiring increased rigidity and load capacity.

Block Styles

Available block styles include:

1. H: square block.
2. F1: flange block mounted from the top.
3. F2: flange block mounted from the bottom.
4. F3: flange block mounted from either the top or bottom.

Square blocks are suitable for narrow machine layouts. Flange blocks provide a wider mounting surface for tables, plates and larger moving components.

Block Length Options

Two block-length options are available:

1. S – Short block.
2. N – Standard block.

The short block saves installation space. The standard block provides a longer contact length and improved moment stability.

Number of Blocks per Rail

The ordering code supports:

1. 1: one block per guide rail.
2. 2: two blocks per guide rail.

Two-block configurations improve table stability and increase resistance to pitching, rolling and yawing moments.

Surface Treatment

Available rail and block surface treatments include:

1. Blank: natural metal finish without additional coating.
2. BB: black chrome coating on both the rail and block.

Black chrome treatment provides additional surface protection for selected operating environments.

Preload Options

Three preload conditions are available:

1. A – Standard clearance.
2. B – Light preload.
3. C – Medium preload.

Increasing preload reduces internal clearance and increases rigidity, but also increases running resistance. The correct preload should be selected according to load, speed, accuracy and drive-force requirements.

Accuracy Grades

Available accuracy classes include:

1. N – Normal.
2. H – High.
3. P – Precision.

Normal grade is suitable for standard automation. High and Precision grades are intended for measuring systems and precision positioning equipment.

Rail Length and First Mounting-Hole Position

Rail length is defined by the customer. For example:

1. X220: 220 mm rail length.
2. S20: 20 mm from the rail end to the center of the first mounting hole.

The first mounting-hole position should remain above the recommended minimum edge margin to ensure stable installation.

Rail Mounting Options

The ordering table shows several mounting-hole configurations:

1. Standard LSD15: top mounting with M4 bolts.
2. LSD15-U: top mounting with M3 bolts.
3. Standard LSD30: top mounting with M6 bolts.
4. LSD30-U: top mounting with M8 bolts.

A final T code indicates a bottom-mount rail configuration.

Grease Nipple and Adapter Options

LSD15 options include:

1. M4: M4 grease nipple.
2. AM6: M4-to-M6 lubrication adapter.

LSD30 options include:

1. M6: M6 grease nipple.
2. A01: M6-to-PT1/8 adapter.
3. L01: M6-to-PT1/8 elbow adapter.
4. LSD30-AM8: M6-to-M8 adapter.
5. LSD30-LM8: M6-to-M8 elbow adapter.
6. SM6: straight lubrication fitting.

These options allow the lubrication connection to match the available machine space and piping direction.

Packing Type

Two packing configurations are available:

1. Blank: rail and block supplied as an assembled set.
2. B: rail and block packed separately.

Separate packing is useful for special assembly processes, multiple-block configurations and replacement requirements.

Ordering Code Example

Example:

LSD15HN1X220S20AH-U-AM6-B-T

Code definition:

1. LSD: low-profile linear guide series.
2. 15: 15 mm rail size.
3. H: square block.
4. N: standard block length.
5. 1: one block per rail.
6. X220: 220 mm rail length.
7. S20: 20 mm first mounting-hole edge distance.
8. A: standard-clearance preload.
9. H: high-accuracy grade.
10. U: optional rail mounting-hole configuration.
11. AM6: M4-to-M6 lubrication adapter.
12. B: block and rail packed separately.
13. T: bottom-mount rail type.

A BB code following LSD indicates black chrome treatment on the rail and block.

Main Features

1. Compact low-profile structure.
2. 45° X-shaped raceway.
3. Self-alignment capability.
4. Equal load capacity in four directions.
5. High rigidity relative to size.
6. Optional preload for additional stiffness.
7. ISO 3290 G10 precision steel balls.
8. Ball-retainer system.
9. Interchangeable rail-and-block design.
10. Square and flange block options.
11. Short and standard block lengths.
12. Multiple mounting and lubrication configurations.
13. Optional black chrome treatment.
14. Separate or assembled packing options.

Product Advantages

1. High positioning accuracy for precision motion systems.
2. Multidirectional load capacity simplifies machine design.
3. Low assembly height reduces machine size and center of gravity.
4. Self-alignment reduces the effect of minor mounting errors.
5. Low rolling friction reduces required drive force.
6. Smooth motion at both low and high speeds.
7. Flexible block styles support different mounting structures.
8. Ball retainer simplifies installation and maintenance.
9. Dustproof structure supports longer service life.
10. Multiple preload and accuracy options suit different applications.

Applications

The LSD Series Low Profile Linear Guide is suitable for:

1. CNC machines and precision machine tools.
2. Industrial and desktop robots.
3. Pick-and-place mechanisms.
4. Automatic assembly equipment.
5. Electronics manufacturing machines.
6. PCB and semiconductor inspection systems.
7. Coordinate and optical measuring instruments.
8. Laser engraving and marking equipment.
9. Industrial printing machines.
10. Automatic packaging equipment.
11. Precision linear tables.
12. X, Y and Z motion axes.
13. Medical and laboratory equipment.
14. Machine-vision systems.
15. Low-profile industrial automation mechanisms.

Selection Guidelines

When selecting an LSD Series Linear Guide, consider:

1. LSD15 or LSD30 size.
2. Square or flange block.
3. Short or standard block.
4. Number of blocks per rail.
5. Required rail length.
6. Applied load and moment direction.
7. A, B or C preload.
8. N, H or P accuracy grade.
9. Top- or bottom-mount rail configuration.
10. Lubrication fitting position and type.
11. Dust protection and surface-treatment requirements.
12. Assembled or separate packaging.

Load capacity, moment ratings, service life and exact dimensions should be confirmed using the detailed specification table for the selected model before ordering.