ABMA 4:1994(R2013) pdf download

ABMA 4:1994(R2013) pdf download.Tolerance definitions and gauging practices for ball and roller bearings
2.1.4 Axes, planes, etc.
2.1.4.1 inner ring (or shaft washer) axis: Axis of the cylinder inscribed in a basically cylindrical bore or of the cone inscribed in a basically tapered bore. The inner ring (or shaft washer) axis is also the bearing axis. 2.1.4.2 outer ring (or housing washer) axis: Axis of the cylinder circumscribed around a basically cylindrical outside surface. 2.1.4.3 radial plane: Plane perpendicular to the bearing or ring axis. It is, however, acceptable to consider radial planes referred to in the definitions as being parallel with the plane tangential to the reference face of a ring or the back face of a thrust bearing washer. 2.1.4.4 radial direction: Direction through the bearing or ring axis in a radial plane. 2.1.4.5 axial plane: Plane containing the bearing or ring axis. 2.1.4.6 axial direction: Direction parallel with the bearing or ring axis. It is, however, acceptable to consider axial directions referred to in the definitions as being perpendicular to the plane tangential to the reference face of a ring or back face of a thrust bearing washer. 2.1.4.7 reference face: Face so designated by the manufacturer of the bearings and which may be the datum for measurements. NOTE – The reference face for measurement is generally taken as the unmarked face. In case of symmetrical rings when it is not possible to identify the reference face, the tolerances are deemed to comply relative to either face, but not both. The reference face of a shaft and housing washer of a thrust bearing is that face intended to support axial load and is generally opposite the raceway face. In the case of single row angular contact ball bearing rings and tapered roller bearing rings, the reference face is the back face which is intended to support axial load.2.1.4.8 outer ring flange back face: That side of an outer ring flange which is intended to support axial load. 2.1.4.9 middle of raceway: Point or line on a raceway surface, halfway between the two edges of the raceway. 2.1.4.10 raceway contact diameter: Diameter of the theoretical circle through the nominal points of contact between the rolling elements and raceway. NOTE – For roller bearings, the nominal point of contact is generally at the middle of the roller. 2.1.4.11 diameter deviation near ring faces: In radial planes, nearer the face of a ring than 1.2 times the maximum (axial direction) ring chamfer, only the maximum material limits apply.
2.2 Boundary dimensions
Diameter (width, height) variations and mean diameters (width, height) defined in this section are the .differences and arithmetical means of the actual largest and smallest single dimensions, not of the permissible limits for the single dimensions. 2.2.1 Bore diameter 2.2.1.1 nominal bore diameter, d: Diameter of the cylinder containing the theoretical bore surface of a cylindrical bore. Diameter, in a designated radial plane, of the cone containing the theoretical bore surface of a tapered bore. NOTE – For rolling bearings, the nominal bore diameter is generally the reference value @sic diameter) for deviations of the actual bore surface. 2.2.1.2 single bore diameter, d,: Distance between two parallel tangents to the line of intersection of the actual bore surface and a radial plane.2.2.1.4 bore diameter variation, V, (of a basically cylindrical bore): Difference between the largest and the smallest of the single bore diameters of an individual ring. 2.2.1.5 mean bore diameter, 4, (of a basically cylindrical bore): Arithmetical mean of the largest and the smallest of the single bore diameters of an individual ring. 2.2.1.6 mean bore diameter deviation, Aam (of a basically cylindrical bore): Difference between the mean bore diameter and the nominal bore diameter. 2.2.1.7 single plane mean bore diameter, hp: Arithmetical mean of the largest and smallest of the single bore diameters in a single radial plane. This diameter, &, measured at the middle of the ring, is used for classification purposes. 2.2.1.8 single plane mean bore diameter deviation, AhP (of a basically cylindrical bore): Difference between a single plane mean bore diameter and the nominal bore diameter. 2.2.1.9 bore diameter variation in a single radial plane, VaP: Difference between the largest and the smallest of the single bore diameters iu a single radial plane. This is also referred to as bore out-of-roundness. 2.2.1.10 mean bore diameter variation, VdmP (of a basically cylindrical bore): Difference between the largest and the smallest of the single plane mean bore diameters of au individual ring. This is also referred to as bore taper.