Crossed Roller Linear Bearings are compact, precision bearings that can support and guide high loads with high accuracy and repeatability, low friction, and low starting force. A complete range of sizes is supplied for use in precision machine tools, measuring instruments, assembly fixtures, medical instruments, and anywhere linear or reciprocating motion with high reliability and long life is required.

Mounting holes in the way bars are threaded, and are also counterbored to alternatively permit using the next smaller size screw with threaded mounting holes in the user's components.

Construction
Each bearing consists of a pair of hardened steel ways containing 90º vee grooves, and a row of alternately crossed cylindrical rollers. The hardened steel rollers are captive in a stainless steel cage for easy handling and assembly and permanent alignment. The ways are installed face to face by the user, with the rollers between the vee grooves.

Stainless Steel is also available.

Application
Bearings are normally supplied and installed in sets of two to form an assembly that can support their rated load in any direction or orientation, and can be preloaded to eliminate side play.

Mounting and banking surfaces must be smooth and flat, and accurately parallel, coplanar, or perpendicular respectively to achieve maximum accuracy. Preload forces must be evenly distributed. Dirt and dust must be excluded. Lubrication required depends on the application, ranging from light grease or oil at the time of installation for low speeds (less than 50 inches/min.) and occasional movement to continuous oil bath or mist at 1200 inches/min.

Ratings and Specifications
Load ratings in the tables are dynamic ratings for each set. Ratings are based on theoretical data, proper installation, appropriate lubrication, and a predicted life of 10 million inches. Ratings are suggested only, based on standard and typical industry practice, and cannot be guaranteed. Life can be increased approximately 10 times by operating a given bearing at 1/2 its rated load, other factors being constant. Temperature of bearings must not exceed 100ºC (212ºF), even for short periods, since this will reduce hardness and result in significantly reduced load capacity and working life.



Maximum deviation from parallelism between the vee groove face and datum faces of each way bar is shown in the graph. Actual accuracy achieved depends on proper installation.

Each set consists of two complete bearings (4 way bars, 2 roller cages, and end stops). Delivery stock to 6 weeks.