General Catalog - NB - #10

Text version of the page

LINEAR SYSTEM The NB linear system is a linear motion mechanism which utilizes the rotational motion of ball and/or roller elements. NB offers a wide range of linear motion products of high precision quality that contribute to the size and weight reduction of machinery and equipment. Eng-1 ADVANTAGES Low Friction and Excellent Response The dynamic friction of the ball or roller elements is substantially lower than that of full-face surface sliding friction. Since the difference between dynamic and static frictional resistance is small, motion response is excellent in terms of positioning accuracy and in high speed applications with acceleration and deceleration. High Precision and Smooth Movement The NB linear system is designed for the rolling elements to achieve extremely smooth motion. The raceway surface is finished by precision grinding for high precision movement with optimal clearance. High Load Capacity and Long Travel Life Despite the compactness of the NB linear system, the system uses relatively large rolling elements on a long raceway resulting in a high load capacity and a long travel life. Ease of Installation The NB linear system shortens machining and assembly time compared with that of a full-face surface sliding bearing. Variety of Types A wide variety of types and sizes of the NB linear systems are available to best serve the purpose for every application and requirement. LINEAR SYSTEM Eng-2 PROCESS FOR SELECTING NB LINEAR SYSTEM I d e n tif y m a c h i n e t y p e to b e used , a p plicatio n co n ditio ns , environmental conditions, and desired accuracy. Slide Guide Ball Spline Slide Bush Slide Way Pre-select the size and number based on balance of machinery and other equipment as well as past experience. Calculate load on each system. Calculate average variable load. (refer to page Eng-6-8) Determine basic static load rating and allowable static moment by applying static safety factor. (refer to page Eng-3) Compute rated life and compare to required life. (refer to page Eng-4) Decide preload and accuracy based on the operating conditions. (refer to each product description for preload and accuracy) S e l e c t l u b r i c a t i o n a n d d u s t prevention method. (seals, bellows, covers) Confirm space and installation dimensions in consideration of the machine size and ease of maintenance. Check the application conditions Decide system type Pre-select the size and number of linear systems Calculate load Determine static load Compute rated life Determine preload and accuracy Select lubrication and dust prevention method Confirm the space needed in the equipment Selection completed OK OK OK OK OK NG NG NG NG