ABMA 3290-2:2014 pdf download

ABMA 3290-2:2014 pdf download,Rolling bearings — Balls — Part 2: Ceramic balls
1 Scope
This part of ISO 3290 specifies requirements for finished silicon nitride balls for rolling bearings.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1132-1, Rolling bearings — Tolerances — Part 1: Terms and definitions ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and procedures for the assessment of surface texture ISO 5593, Rolling bearings — Vocabulary ISO/TS 12181-1, Geometrical Product Specifications (GPS) — Roundness — Part 1: Vocabulary and parameters of roundness ISO 15241, Rolling bearings — Symbols for quantities ISO 26602:— 1) Fine ceramics (advanced ceramics, advanced technical ceramics) — Silicon nitride materials for rolling bearing balls
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1132-1, ISO 5593 and the following apply. 3.1 nominal ball diameter diameter value which is used for the general identification of a ball size [ISO 5593:1997, 05.04.01] 3.2 single ball diameter distance between two parallel planes tangential to the actual surface of a ball [ISO 5593:1997, 05.04.02] 3.3 mean ball diameter arithmetical mean of the largest and the smallest of the single diameters of a ball [ISO 5593:1997, 05.04.03] 3.4 variation of ball diameter difference between the largest and the smallest of the single diameters of a ball [ISO 5593:1997, 05.04.04] 3.5 deviation from spherical ball surface various types of deviation from the perfect spherical ball surface, uniformly or non-uniformly distributed and repeated around the ball surface NOTE The deviations to which limits can be attributed are: ⎯ deviation from spherical form; ⎯ waviness; ⎯ surface roughness; ⎯ surface defect. 3.5.1 deviation from spherical form radial distance between the smallest circumscribed sphere and the greatest inscribed sphere, with their centres common to the least squares sphere centre NOTE This definition supersedes ISO 5593:1997, 05.06.03. 3.5.2 waviness surface irregularities of random or periodical deviation from the ideal spherical form NOTE 1 Waviness can be evaluated as velocity amplitude by default. NOTE 2 In practice, the waviness components are separated from the real surface by a waviness analyser (filters). 3.5.3 surface roughness surface irregularities with relatively small spacings, which usually include irregularities resulting from the method of manufacture being used and/or other influences NOTE These irregularities are considered within the limits that are conventionally defined, e.g., within the limits of the sampling length. 3.5.4 surface defect element, irregularity or group of elements and irregularities of the real surface, unintentionally or accidentally caused during manufacture, storage, handling or use of the surface NOTE 1 These types of element or irregularity differ considerably from those constituting the surface roughness and are not considered during the measurement of the surface roughness. NOTE 2 The limits for surface defects are not specified in this part of ISO 3290. 3.6 ball lot definite quantity of balls manufactured under conditions presumed uniform and which is considered as an entity [ISO 5593:1997, 05.04.05] 3.7 mean diameter of ball lot arithmetical mean of the mean diameters of the largest ball and the smallest ball in a ball lot [ISO 5593:1997, 05.04.06] 3.8 variation of ball lot diameter difference between the mean diameters of the largest ball and the smallest ball in a ball lot [ISO 5593:1997, 05.04.07] 3.9 ball grade specific combination of dimensional, form, surface roughness and sorting tolerances for balls [ISO 5593:1997, 05.04.08] NOTE Ball grade is identified by the letter G and a number, e.g. G 20. 3.10 ball gauge amount by which the mean diameter of ball lot should differ from the nominal ball diameter, this amount being one of an established series [ISO 5593:1997, 05.04.09] NOTE 1 Each ball gauge is a whole multiple of the ball gauge interval established for the ball grade in question. NOTE 2 A ball gauge, in combination with the ball grade and nominal diameter, is considered as the most exact ball size specification to be used by a customer for ordering purposes. 3.11 deviation of a ball lot from ball gauge difference between the mean diameter of a ball lot and the sum of the nominal ball diameter and the ball gauge [ISO 5593:1997, 05.04.10] 3.12 ball subgauge amount, of an established series of amounts, which is the nearest to the actual deviation from the ball gauge of a ball lot [ISO 5593:1997, 05.04.11] NOTE 1 Each ball subgauge is a whole multiple of the ball subgauge interval established for the ball grade in question.