BS ISO 3548‑2:2020 pdf download.Plain bearings — Thin-walled half bearings with or without flange.
1 Scope
This document specifies in accordance with ISO 12301 the checking of the wall-thickness of thin- walled half hearings with or without flange and describes the necessary checking methods and measuring equipment.
It applies to a maximum bearing diameter of 150 mm. It can be applied to a bigger diameter, provided that there is an agreement between the supplier and the user.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 3548-1. Plain bearings — Thin-walled ha If bearings with or wit hout flange — Part 1: Tolerances, design features and methods of test
3 Terms and definition
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— I EC Electropedia: available at http://www.electropedia.org/
For the purposes of thisdocument, the lollowing definitions apply:
3.1
wall thickness
S3
radial distance between the opposing measuring points at the inner and outer cylindrical surfaces
Note 1 to entry: See Figure 1.
The presence of lubricating holes, oil pockets, oil grooves, markings or special chamfers may require deviation from the measuring lines and measuring points specified in the following and shall be agreed between the customer and the supplier.
Any wall thickness not conforming to the specified values due to the manufacturing process, because of deformation of the bearing backing in the area of marking or at non-load bearing places, shall be agreed between the customer and the supplier.
6.2 Line measurement around the circumference
Measurement of the wall thickness around the circumference shall be carried out at the measuring lines specified in Figure 3 and Tables 2 and 3.
7 Requirements for measuring equipment and specimen for the contact method
7.1 Tip-radius for measuring pin on the outside surface
The tip-radius at the gauge measuring pin positioned on the outside surface shall be 3,0 mm ± 0,2 mm.
7.2 Tip-radius for measuring pin on the inside surface
The tip-radius at the gauge measuring pin positioned on the inside surface shall be as given in Table 5 as a function of the plain bearing outside diameter D 0 and the lining material.
7.3 Measuring pin load
The measuring pin load F pin applied onto the lining material shall be 0,8 N to 2,5 N. Load should be set according to the hardness of the lining material (e.g. for soft sliding overlays, low load should be used).
7.4 Set-up
The measuring device is set to the nominal value of the thickness by a master block.
7.5 Periodical control
The measuring device is checked periodically with the master block from set-up.BS ISO 3548‑2 pdf download.