Overview

The PLK series (sizes 16 to 63) is a highly robust linear guide system designed specifically for machine tools and industrial robotics applications. It features a proven rodless cylinder design with diameters ranging from 16 to 63 mm, providing direct force transmission and smooth, quiet operation.

Key Features and Benefits

• High load capacity with excellent static load resistance in all directions
• Hardened and precision-ground guide rails for durability and smooth movement
• Use of rolling bearing steel balls and robust ball covers for reliability
• Lubrication nipples accessible from all sides for easy maintenance
• Easy interchangeability of components

Technical Specifications

• Design: Double-acting rodless cylinder with direct force transmission
• Stroke Lengths: 100 to 5700 mm in 1 mm increments for Ø 25-63 mm; 100 to 3300 mm for Ø 16 mm (longer strokes available on request)
• Air Connections: M5, G 1/8", G 1/4", G 3/8"
• Mounting: Any orientation possible
• Operating Temperature: -10°C to +80°C (other ranges on request)
• Materials: High-strength anodized aluminum profile tube and end caps; steel or stainless steel guides; oil-resistant synthetic seals (NBR for speeds <1 m/s, Viton for ≥1 m/s); stainless steel sealing bands; wear-resistant synthetic piston caps and sliding parts
• Operating Pressure: 0.5 to 8.0 bar
• Medium: Filtered compressed air (max 50 µm)

Dimensions and Components

Detailed dimensional data is provided for shock absorbers, carriage systems (Uno and Tandem), and mounting accessories. Dimensions vary by cylinder diameter and include parameters such as cushioning length, mounting hole sizes, and carriage dimensions.

Forces and Moments

The document specifies maximum permissible load forces and moments (axial, radial, and torsional) related to the center of the guide rail. Load forces are the sum of all individual forces referenced to their common center of mass, which may lie inside or outside the carriage surface area.

Dynamic loads on the carriage must be considered when selecting module size, ensuring both piston drive force and carriage rolling capability are sufficient. The following formulas are used to calculate moments:

• Axial moment (Ma) = Force (F) × axial lever arm (ha)
• Radial moment (Mr) = Force (F) × radial lever arm (hr)
• Torsion moment (Mv) = Force (F) × torsion lever arm (hv)

Performance Characteristics

For tandem systems, the maximum moments and forces are approximately doubled, enhancing load capacity.

Product Variants and Accessories

The PLK series includes Uno (single) and Tandem carriage systems across all sizes. Ident numbers and descriptions are provided for each variant.

Accessories include shock absorber mounts and stops made from zinc diecasting, available for various cylinder diameters.

Recommendations and Notes

• Moments are always referenced to the guide rail center; load forces are the sum of all individual forces relative to their common center of mass.
• Dynamic loads on the carriage must be accounted for in module sizing to ensure sufficient piston force and rolling capability.
• Special versions with Viton seals and stainless steel components are available upon request.

Summary

The PLK linear unit series offers a robust, high-performance solution for demanding industrial applications requiring precise linear motion with high load capacity and durability. Its modular design, comprehensive technical data, and accessory options facilitate tailored integration into machine tools and robotic systems.