ANSI B3.2-1992 pdf download Rolling Element Bearings – Aircraft Engine, Engine Gearbox, and Accessory Applications – Surface Visual Inspection
1 Scope This standard establishes a system for uniform visual acceptance criteria for aircraft engine, gearbox and accessory anti-friction bearings in continuous rotation applications made of the material listed in table 1. The standard require- ments are in a flow chart format; the written text is supplementary and is used as support for the flow charts.
2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. MIL-STD-1 30 G-1 988, Identification marking of US military property1 1
3 Definltlons
3.1 Surfaces
3.1 .1 functional surface: All active surfaces of a bearing, specifically the following: – rolling elements: All surfaces (except roller corners for class C);
– rings: Raceway surfaces; guide rib adjacent to raceway (roller bearings);
– cage (retainer): Entire pocket (except retention features); piloting (land riding) surface.
3.1.2 nonfunctlonal surface: All surfaces other than those defined as functional includ- ing, but not limited to, faces, outside diameters, inside diameters, slots, corners, flanges, etc.
3.2 Llmlts on spacing and number of lmperfectlons
3.2.1 individual Ilmlts: Individual limits on the size of imperfections of the same type, without regard to their number or spacing. (A lower size limit may apply if there is a clus- ter of imperfections of the same type.)
3.2.2 cluster Ilmlts: Cluster limits on size and number applying to two or more imperfec- tions of the same type, clearly separated, which can be contained within a circle of the maximum diameter allowed by the assigned standard. (Imperfections lying outside the circle are treat- ed as individual when they lie at least the dis- tance of the circle apart from each other.)
3.3 lmperfectlons
3.3.1 bulge: A swelling or protuberance caused by deformation of the part. This does not include intentional deformation required for rolling element retention. 3.3.2 burrs: Flakes of metal or roughness (feather-edge) found attached at intersecting surfaces such as corners, drilled holes, milled slots, grooves, and identification stamps.