BS ISO 3547‑6:2020 pdf download.Plain bearings — Wrapped bushes.
1 Scope
The document specifies, following ISO 12301, the checking of the inside diameter of wrapped bushes (see ISO 3547-2:2017, method C) and describes the necessary checking methods and measuring equipment.
NOTE 1 All dimensions in this document are given in millimetres except where otherwise noted/designated.
NOTE 2 The dimensions and tolerances of wrapped bushes are given in ISO 3547-1.
NOTE 3 Checking of the wall thickness is the subject of ISO 3547-7.
NOTE 4 Checking of the outside diameter of wrapped bushes is the subject of ISO 3547-5.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Symbols and units
For the purposes of this document, the symbols and units given in Table 1 apply.
5 Method of checking
The free diameter of a wrapped bush is not measured directly because of the flexible nature of the components. To check the inside diameter, D i,ch , the bush is pressed into a ring gauge whose nominal diameter D i corresponds to the dimension of the housing. For bushes specified in ISO 3547-1, the tolerance class of housing bore is normally H7. When the bush is pressed into the ring gauge, it is possible that there is a permanent reduction in the outside diameter. The inside diameter, D i,ch , is measured with a three-point measuring instrument or with a GO or a NO GO gauge. In order to enable the supplier and the user to compare results of this test, it shall be agreed whether results shall be obtained by measuring or by gauging.
6 Test equipment
6.1 Ring gauge Unless otherwise agreed between supplier and user, the dimensions shown in Figure 1 and given in Table 2 are valid for the ring gauge.
6.4 Requirements for measuring equipment
The ring gauge and plug gauge shall be from hardened (60 HRC to 64 HRC) and non-ageing steel.
6.5 Measuring errors
Frequent measuring errors are as follows.
a) Ring gauge and plug gauge are damaged or worn.
b) Ring gauge and plug gauge have no lead-in chamfer.
c) Bush is misaligned when introduced into the ring gauge.
d) Plug gauge is misaligned when introduced into the bush.
e) Width of the ring gauge is less than the width of the bush.
f) Grease, dirt, damages, burrs and swelling are present around features on the bush and test
equipment.BS ISO 3547‑6 pdf download.