BS ISO 3547-7:2020 pdf free.Plain bearings — Wrapped bushes Measurement of wall thickness ofthin-walled bushes.
This document describes, following ISO 12301, the checking methods and measuring equipment usedfor measuring the total wall thickness of thin-walled bushes in the finished state.NOTEAll dimensions in this document are given in millimetres.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies.Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO 12301,Plain bearings —Quality control techniques and inspection of geometrical and material qualitycharacteristics.
For the purposes of this document, the following terms and definitions apply.
The purpose of checking is to ensure that the wall thickness and wall thickness tolerances are inaccordance with ISO 3547-1.If this measurement is required, it is designated by sg; see IS0 3547-1.The gauging axis of the measuring device shall be in the radial direction and perpendicular to theoutside surface of the test piece in order to find the minimum value of the wall thickness.The measuredvalues may be recorded by a single measurement or by a sum measurement, as represented symbolicallyin Figure 2.
The presence of lubricating holes, oil pockets, oil grooves,markings or special chamfers can requiredeviation from the measuring lines and measuring points specified in 6.2 and 6.3.Any such deviationshall be agreed between customer and supplier.
Any wall thickness not conforming to the specified values due to the manufacturing process, becauseof deformation of the bearing backing in the area of marking or at non-load-bearings places of wrappedbushes, shall be agreed between customer and supplier.
Line measurement around the circumference:Continuous measurement of the wall thickness around the circumference shall be carried out at themeasuring lines specified in Figure 3 and Table 2.Point-by-point measurement of wall thickness shall be carried out at the measuring points specified inFigure 4 for widths of B s 90 mm and outside diameter D, s 150 mm.In the case where B > 90 mm andD> 150 mm, the measurement method shall be subject to agreement between the supplier and user.The measuring position distance, ac, shall be taken from Table 2.BS ISO 3547 pdf download.