1、BRITISH STANDARD BS 4065:1966 Specification for Plain setting rings for use with internal diameter measuring machines Inch unitsBS 4065:1966 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee and endorsed by the Chairman ofthe Engineering Divisional
2、Council, was published under theauthority of the General Council on 22nd September 1966 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference MEE/59 Draft for comment D64/10832 ISBN 0 580 32431 1 Co-operating organizations The Mechanical Engineering Indust
3、ry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee Association of Consulting Engineers Association of Mining Elec
4、trical and Mechanical Engineers Board of Trade British Chemical Plant Manufacturers Association British Compressed Air Society British Electrical and Allied Manufacturers Association British Gear Manufacturers Association British Internal Combustion Engine Manufacturers Association British Iron and
5、Steel Federation British Mechanical Engineering Federation British Railways Board Crown Agents for Oversea Governments and Administrations Electricity Council, the Generating Board and the Area Boards in England and Wales Engineering Equipment Users Association Gas Council Institute of Marine Engine
6、ers Institution of Civil Engineers Institution of Gas Engineers Institution of Heating and Ventilating Engineers Institution of Mechanical Engineers Institution of Mechanical Engineers (Automobile Division) Institution of Production Engineers Locomotive and Allied Manufacturers Association of Great
7、Britain London Transport Board Machine Tool Trades Association Ministry of Defence, Army Department Ministry of Defence, Navy Department Ministry of Labour (H.M. Factory Inspectorate) Ministry of Power Ministry of Public Building and Works Ministry of Technology National Engineering Laboratory Minis
8、try of Transport National Coal Board National Physical Laboratory (Ministry of Technology) Radio Industry Council Royal Institute of British Architects Amendments issued since publication Amd. No. Date CommentsBS4065:1966 BSI 02-1999 i Contents Page Co-operating organizations Inside front cover Fore
9、word ii Introduction 1 1 Scope 1 2 Material and hardness 1 3 General features of design 1 4 Surface texture 2 5 Accuracy 2 6 Certificate and marking 3 Appendix A Stabilization of steel setting rings 4 Appendix B Recommended general dimensions of setting rings 4 British Standards Inside back coverBS
10、4065:1966 ii BSI 02-1999 Foreword In order to keep abreast of progress in the industries concerned, British Standards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notice of the committees charged with the revision of the standards t
11、o which they refer. A complete list of British Standards, numbering over4000, fully indexed and with a note of the contents of each, will be found in the British Standards Yearbook. The BS Yearbook may be consulted in many public libraries and similar institutions. This standard makes reference to t
12、he following British Standards: BS 1044, Gauge blanks. BS 1134, Centre-line average height method for the assessment of surface texture. BS 3730, Methods for the assessment of departures from roundness. This standard has been prepared under the authority of the Mechanical Engineering Industry Standa
13、rds Committee. It forms one of a series of standards, published and in course of preparation, for engineers precision tools and has been prepared with the co-operation of the manufacturers and in close collaboration with the National Physical Laboratory. It provides only for inch setting rings; simi
14、lar requirements for metric rings are given in a separate standard. Numerous types of instruments are now available for the measurement of internal diameters. They vary in design, application and accuracy of performance. Many of these instruments effect measurements by means of two-point contacts bu
15、t some use three-point contacts and indicate a derived diameter and others, notably air gauges, do not use contacts at all. The present standard covers requirements for plain rings intended for setting such instruments and suitable for use with those employing two-point or three-point measuring cont
16、acts and with those which are independent of physical contact. They are in three grades of accuracy and the standard has been based on considerations aimed at providing a series of plain setting rings that will serve for all types of internal measuring equipment whilst at the same time avoiding the
17、high costs entailed in manufacturing unnecessarily close to a specified size. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself con
18、fer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated
19、 in the amendment table on theinside front cover.BS4065:1966 BSI 02-1999 1 Introduction The first requirement for a setting ring is that its measuring surface is cylindrical to within close limits. The actual diameter of the ring is relatively unimportant providing its size is known, or known to be
20、within specified limits. Separate tolerances have therefore been allocated for truth of cylindrical form and for departure of diameter from nominal size; thus, Columns2 and3 of the table in5.4 give values designed to ensure that the bore of the ring is round and parallel within limits consistent wit
21、h its grade of accuracy and Column4 gives the recommended maximum departures of the mean measured diameter from the nominal size specified by the user. Although, as has already been stated, the actual diameter of the ring is less important than its geometrical form, it is nevertheless essential to k
22、now, when setting an instrument, how closely the size stated for the ring has been established and Column5 accordingly specifies the accuracy of determination appropriate to the various grades. Further, when considering the diametral tolerances for setting rings, it is important that the effect of p
23、ossible departures from ideal roundness be clearly understood. It is a well known fact that uniform diametral measurements of a cylinder, obtained by using two diametrically opposite measuring contacts, do not necessarily mean that the cylinder is truly circular in section. It may suffer from depart
24、ures from ideal roundness. Measurement of a cylinder by means of three contacts, for example, may reveal form deviations undetected when only two opposite contacts are used. In order to ensure that departures from roundness can be expressed numerically and consistently controlled and assessed, a Bri
25、tish Standard, BS 3730 1) , has been published and deals in detail with the numerical assessment of departures from ideal roundness. All references in the present standard to the departures of setting rings from ideal roundness are based on the procedures recommended in BS3730. The standard calls fo
26、r all setting rings to be examined for departures from ideal roundness. This is to ensure that any ring complying with the standard will be suitable for checking all types of internal measuring equipment regardless of whether two or three measuring contacts are employed. 1 Scope 1.1 This British Sta
27、ndard relates to plain setting rings primarily intended to be used, either singly or in combination, for checking the scales on internal diameter measuring equipment. It provides for a range of inch rings in sizes from008 in to6inches in three grades of accuracy, viz. Grades AA, A and B. NOTESizes b
28、elow008 in are not included because it is impracticable to measure them. Requirements are specified for material, hardness and surface texture and recommended sections for the setting rings covered by this standard are included in an appendix. 2 Material and hardness 2.1 Setting rings shall preferab
29、ly be made of good quality steel suitably hardened and stabilized and free from inclusions. The measuring surface of a steel setting ring shall have a hardness value of not less than750HV(59HRC). Other materials may be used only if the setting rings produced have properties of hardness and stability
30、 at least equal to those specified for steel setting rings. NOTEDetails of a method of stabilizing suitable for plain carbon steel are given in Appendix A. 3 General features of design 3.1 Both end faces of the rings shall be finished and the edges of the bore shall have a small chamfer or radius. T
31、he axis of the bore shall be square to the supporting surface to within0001 in per inch and the ring, when placed on an accurately flat surface, shall be free from rock. Recommended general dimensions for the outside diameter and depth of measuring surface of setting rings are given inAppendix B. 1)
32、 BS 3730, “Methods for the assessment of departures from roundness.”BS4065:1966 2 BSI 02-1999 4 Surface texture 4.1 When assessed in accordance with BS1134 2) , the surface texture of the measuring surface of a setting ring shall have a roughness value not exceeding the following amounts: Any defect
33、 in the measuring surface shall not influence the use of the ring nor, in the case of a new ring, detract from the appearance associated with a precision setting standard. 5 Accuracy 5.1 General. All measurements shall be referred to the standard temperature of20 C. NOTECare should be taken when usi
34、ng the rings to avoid excessive handling which might cause variations in size due to heating. 5.2 Geometric form. Within the middle half of the depth of the ring the cylindrical measuring surface, as measured with a two-point contact, shall be uniform in diameter, i.e. it shall be parallel, to withi
35、n the values given in Column2 of the table, and when assessed in accordance with BS3730 3)departures from ideal roundness shall not exceed the permissible values given in Column3. The departure from roundness is defined as the difference in radii of two co-planar concentric circles, the annular spac
36、e between which just contains the profile of the surface examined. 5.3 Measured size. The mean diameter of a setting ring shall be taken as the mean of at least four diameter measurements made at the mid-plane and it is recommended that this diameter does not depart from the nominal size of the ring
37、 by more than the amounts given in Column4 of the table. If required, the measured size at a localized plane may be specified for Grade AA rings. 5.4 Accuracy of determination. The measured size referred to in5.3 above shall be determined with the accuracy specified for the grade in question in Colu
38、mn5 of the table.Accuracy of setting rings 2) BS 1134, “Centre-line-average height method for the assessment of surface texture.” Grade AA 2 micro-in CLA Grade A 4 micro-in CLA Grade B 8 micro-in CLA 3) BS 3730, “Methods for the assessment of departures from roundness.” Unit=1micro-inch (0000001in)
39、1 2 3 4 5 Geometric form Recommended maximum departures of mean measured size from nominal size (measured in the mid-plane) Accuracy of determination of measured size Uniformity of diameter as measured by two-point contact Roundness a Grade AA A B AA A B AA A B AA A B Nominal diameter in inches Over
40、 Up to and including 0079 1 2 4 1 2 4 6 20 40 60 80 50 100 150 200 100 200 300 400 10 20 30 40 25 50 75 100 50 100 150 200 30 60 90 120 80 150 230 300 150 300 450 600 10 20 30 40 30 50 80 100 50 100 150 200 a See5.2BS4065:1966 BSI 02-1999 3 6 Certificate and marking 6.1 Certificate. The manufacturer
41、 shall supply a certificate of measured size with each setting ring. 6.2 Marking. Each setting ring shall be legibly and permanently marked on the top face with the particulars given below. The marking shall be applied in such a manner that it does not affect the accuracy of the setting ring. 1) The
42、 manufacturers name or trade mark. 2) The number of this British Standard, BS4065. 3) The grade, i.e. AA, A or B. 4) A serial number. 5) If required by the purchaser, the measured size of the ring. NOTEThe mark BS4065 on or in relation to the product is a claim by the manufacturer that it complies w
43、ith the requirements of the standard. The British Standards Institution is the owner of a registered certification trade mark. This is shown below, enclosed in the words “Approved to British Standard”. This mark can be used only by manufacturers licensed under the certification mark scheme operated
44、by the BSI. The presence of this mark on or in relation to a product is an assurance that the goods have been produced to comply with the requirements of the British Standard under a system of supervision, control and testing operated during manufacture and including periodical inspection at the man
45、ufacturers works in accordance with the certification mark scheme of the BSI. Further particulars of the terms of licence may be obtained from the Director, British Standards Institution,2 Park Street, London, W.1. BS4065:1966 4 BSI 02-1999 Appendix A Stabilization of steel setting rings A suitable
46、method of stabilizing steel setting rings is as follows: The rings are stabilized after hardening by heating them to, and maintaining them at, a temperature of150C for a period of from5 to10hours and allowing them to cool slowly in the furnace. Appendix B Recommended general dimensions of setting ri
47、ngs NOTEAlthough the dimensions given in the above table differ in some respects from those specified for plain ring gauges in BS1044 “Gauge blanks”, the nearest corresponding standard blank will in most cases be suitable. 1 2 3 4 D D 1 T Over Up to and including in in in in 0079 02 04 06 08 10 15 2
48、0 25 30 35 40 45 50 55 02 04 06 08 10 15 20 25 30 35 40 45 50 55 60 08 12 14 20 26 33 40 45 50 55 60 65 72 81 90 03 04 06 08 10 12 12 12 14 14 14 14 14 15 15BS4065:1966 BSI 02-1999 BRITISH STANDARDS The following are available on application: YEARBOOK Including subject index and numerical list of Br
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