Cross Roller Rail Design Considerations




CROSS ROLLER / CROSS BALL RAIL

Comprised of two pieces of stainless steel rails with V-shaped grooves which been hardened and ground forming precise rolling elements. Cross roller rail moves with alternate 90 degrees rollers to accomplish high parallelism and high flatness. In construction, rolling elements are transmitted in cross-contact by precise roller and V-shaped grooves in rails, and in non-circulation.

APPLICATIONS

Widely used across a variety of applications where heavy duty or light duty is required. They are used in a variety of manufactured products such as:

  • Measuring Instruments
  • Printed Circuit Boards
  • Drilling Machine
  • Slide Table Used In Optical Measuring Instrument
  • Precise Gauge In Optical Experiment
  • Precision Fine Tuning Optical Stage
  • Operation Mechanism
  • Survey Device
  • Precise Positioning Quantitative Movement X-Ray Device
  • Micro-Hole Edm

LUBRICATION

All linear motion applications require proper lubrication. Abrasion and lack of lubrication will reduce life by 90%. Function of lubrication:
1. Reduce friction between running parts.
2. Apply a light oil film on rolling surface to reduce abrasion of metal to extend life of rolling elements.
3. Coating on metal surface to prevent rust.

GRV ROLLER


Composed of precise crossed rollers with hardened stainless steel forming V-shaped rail guides to create linear motion elements with high accuracy.
Limited stroke linear motion system with high rigidity, high load, and fast moment.

GBV BALL


Composed of ball retainer combined with precision ball bearings matched with precision ground V-shaped grooved rails. Limited stroke linear motion system with low friction, light load and high accuracy.

ADVANTAGES

Suited for micro-movement applications due to small amount of frictional resistance, with almost no difference between starting friction resistance and dynamic friction resistance.

Stability in low speed applications: Even in the case of light loading, low to high speed variations are stable due to the low amount of frictional resistance.

High rigidity - high loading capacity applications: Compared between roller or ball rails. Roller rails have a higher capacity due to their larger contact area, less elasticity deformation, and noncirculation, and great effective number of units in contact.

Low noise: Nook linear motion cross roller rail has no circulated rotating, no noise ocurred. Using roller with roller retainer makes no noise caused by contact friction in between each rolling uint moves alternately, to ensure a quiet movement motion.

ACCURACY LEVEL




ACCURACY ALLOWABLE TOLERANCE

Figure 1