BS ISO 3547‑5:2020 pdf download.Plain bearings — Wrapped bushes.
7.2 Checking method A — Measurement of outside diameter, D o
Check the outside diameter of a wrapped bush using measuring equipment as shown in Figure 2, with a checking block consisting of upper and lower halves (see Figures 3 and 4) and setting plugs (see Figures 5 and 6), at a determined checking load, F ch .
Measure the outside diameter indirectly as the difference in the value of z, Δz.
The checking load is calculated so that the bush outside diameter is reduced only elastically during checking and that there is no permanent deformation.
7.3 Checking method B — Gauging of outside diameter, D o
Check the outside diameter of a wrapped bush in “GO” and “NO GO” ring gauges.
7.4 Checking method D — Measurement of outside diameter, D o > 120 mm
Check the outside diameter of a wrapped bush above 120 mm diameter using a precision measuring tape.
8 Selection of checking method for outside diameter
Method A is a precise method involving complex tooling. Method B is an attributive method using simpler tooling. Method D is used only for wrapped bushes with an outside diameter > 120 mm. All three methods are in general use. Method A is generally unsuitable for small bushes up to 10 mm outside diameter but is preferred for bushes over 10 mm outside diameter.
9 ISO 3547-2:2017, test A — Outside diameter, Do
9.1 Measuring equipment
Typical equipment for measuring the bush consists essentially of the following components:
— base plate used as fixture and guiding device for the split checking block;
— means to generate the checking load;
— means to calibrate the measuring load (see Table 2);
— upper plate;
— system for transmitting the distance, z, of both checking block halves to the measuring pin (see Figure 2);
— measuring pin with indicating instrument (see Table 3);
— checking block (see Figures 3 and 4) with setting plug (see Figures 5 and 6).
9.5 Measuring errors
9.5.1 General
The most frequent errors are given in 9.5.2 to 9.5.4.
9.5.2? Errors? due? to? measuring? equipment
a) The upper and lower checking block halves are not aligned.
b) The checking block halves are not correctly fixed in the measuring equipment.
c) The tightness is not correct [e.g. too much clearance, damage of the transmitting system (see
Figure 2), dial gauge].
d) The checking block or setting plug is damaged or worn.
e) The width of the checking block bore, b ch,1 , is less than the width of the bush, B.
f) The checking load, F ch , does not correspond to the calculated load.BS ISO 3547‑5 pdf download.