(GPS) and tolerance values
Roulements — Roulements radiaux — Spécifi cation géométrique des produits (GPS) et valeurs de tolerance.
Cl General
Due to the alignment with geometrical product specifications (GPS), the terms and definitions of some tolerance characteristics have been changed. This is obvious if the terms and definitions of ISO 1132-1141 (which were the basis of previous editions of ISO 492) and the terms and definitions of ISO/GPS standards are compared.
This Annex illustrates the differences in terms of some characteristics.
C.2 Single bore diameter versus two-point diameter C.2.l Single bore diameter according to ISO 113 2-1
For graphical representation, see Figures Ci. and Cl.
C.2.i.1
single bore dianieter d5
distance between two parallel tangents to the line of intersection of the actual bore surface and any radial plane
ISOURCE: ISO 1132-1:2000, 5.1.2J
c.2.1.2
plane perpendicular to an axis
Note ito entry: For a bearing ring, it is generally acceptable to consider a radial plane as being parallel with the plane tangential to the reference face of the ring.
ISOURCE: ISO 1132-1:2000, 4.5J
C.2.1.3
Inner ring axis
axis of the cylinder or cone inscribed in the basically cylindrical or tapered bore of an inner ring
ISOURCE: ISO 1132-1:2000,4.21
C.2.2 Two-point diameter according to ISO 14405-1 and ISO 14660-2 For graphical representation, see FigurcC,3.
C.2.2.1 Terms and definitions according to Iso 14405-1
c.2.2.1.1
two-point size
<local size> distance between two opposite points taken on the feature of size
Note 1 to entry: A two-point size taken on cylinder can be called a two-point diameter. In ISO 14660-21131 this is defined as a local diameter of an extracted cylinder.
Note 2 to entry: A two-point size taken on two opposite planes can be called a two-point distances. In ISO 14660-21131 this is defined as a local size of two parallel extracted surfaces.
[SOtIRCE: ISO 14405-1:2010, 3.10.11
C2.2,2 Terms and definitions according to ISO 14660-2
C.2.2.2.1
local size of an extracted cylinder
local diameter of an extracted cylinder
distance between two opposite points on the feature, where
— the connection line between the points Includes the associated circle centre, and
— the cross-sections are perpendicular to the axis of the associated cylinder obtained from the extracted surface
[SOURCE: ISO 14660-2:1999, 3.5]
C.2.2.2.2
extracted median line of a cylinder
locus of centres of cross-sections, where
— the centres of cross-sections are centres of associated circles, and
— the cross-sections are perpendicular to the axis of the associated cylinder obtained from the extracted surface (i.e. the radius could be different from the nominal radius)
ISOURCE: ISO 14660-2:1999, 3.2J
C.2.2.2.3
extracted median line of a cylinder
For the default definition (unless otherwise specified) of the extracted median line of a cylinder, the following conditions apply:
— the associated circles are the total least squares circles;
— the associated cylinder is the total least squares cylinder