ABMA 25.2:1991 pdf free

ABMA 25.2:1991 pdf free.Rolling Bearings, Linear Motion,Recirculating Ball, Sleeve Type Inch Series
Linear motion bearings provide for rectilinear motion as opposed to rotational motion. The type of bearing described in this standard uses balls which circulate in a number of closed loops in the cylindrical bearing body which surrounds the shaft. See Figure 1.
Linear bearings are typically applied to meet one or more of the following criteria:
a. Smooth anti-friction motion, free from stick-slip or chatter.
b. Low force required to produce relative linear motion between the bearing and shaft.
These requirements, as well as others, can be met by appropriate use of the various linear bearing types (closed type, adjustable type, open type). The appropriate selection of bearing type and specification should be established between the manufacturer and the user.
Linear bearing – A basically cylindrical sleeve with a number of closed loops of circulating balls which is designed to achieve linear rolling motion along a shaft.
Shaft – The hardened cylindrical rod along which a linear bearing traverses.
Nominal outside diameter- -The diameter of the cyinder containing the theoretical surface of a basically cylindrical outside surface.
Nominal ball complement bore diameter- -The diameter of the cylinder inscribed inside the inner balls.
Nominal bearing width- Distance between two theoretical end faces designated to bound the width of the linear motion rolling bearing.
Radial runout – The difference between the largest and the smallest radial distance between the outside surface of the cylindrical sleeve and the centerline of the ball complement bore diameter.
Closed type – That type in which the outer sleeve is continuous, or virtually continuous, whereby adjustment of clearance between the ball complement bore and the shaft can be achieved only by selection of the housing fit, shaft precision class, and the bearing.
Adjustable type – That type which has elastic features which permit mechanical adjustment of the clearance between the ball complement bore and the shaft.
Open type – That type in which a longitudinal section is removed to provide clearance over shaft support rails.ABMA 25.2 pdf free download.