1、BRITISH STANDARD BS 4185-9: 1976 Incorporating Amendment No. 1 Specification for Machine tool components Part 9: Levelling screws, nuts and seating plates UDC 621.9:621.81+621.9219:621.882BS4185-9:1976 This British Standard, having been prepared under the directionof the Mechanical Engineering Indus
2、try Standards Committee, was published underthe authority of the Executive Board on 30April1976 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for comment 74/71865 DC ISBN 0 580 09221 6 Co-operating organizations The Mechanical Engineeri
3、ng Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and professional and industrial organizations: Associated Offices Technical Committee Association of Consulting Engineers Association of
4、Hydraulic Equipment Manufacturers Ltd. Association of Mining Electrical and Mechanical Engineers British Compressed Air Society British Electrical and Allied Manufacturers Association British Gas Corporation British Gear Manufacturers Association British Internal Combustion Engine Manufacturers Asso
5、ciation British Mechanical Engineering Confederation British Pump Manufacturers Association British Steel Corporation British Steel Industry Crown Agents for Oversea Governments and Administration Department of the Environment* Department of Industry* Department of Trade Electricity Supply Industry
6、in England and Wales Engineering Equipment Users Association Federation of Manufacturers of Construction Equipment and Cranes Health and Safety Executive (HM Factory Inspectorate) Institution of Gas Engineers Institution of Heating and Ventilating Engineers Institution of Mechanical Engineers* Insti
7、tution of Plant Engineers Institution of Production Engineers* London Transport Executive Machine Tool Trades Association* Ministry of Defence* National Coal Board National Engineering Laboratory Department of Industry Process Plant Association Railway Industry Association of Great Britain Royal Ins
8、titute of British Architects Society of Motor Manufacturers and Traders* Telecommunication Engineering and Manufacturing Association The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of
9、this British Standard. Association of Scientific Technical and Managerial Staffs Ball and Roller Bearing Manufacturers Association Machine Tool Industry Research Association National Federation of Engineers Tool Manufacturers University of Manchester Institute of Science and Technology Individual ex
10、perts Amendments issued since publication Amd. No. Date of issue Comments 4579 June 1984 Indicated by a sideline in the marginBS4185-9:1976 BSI 11-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Material 1 4 Dimensions 1 5 Finish 1 6 Designat
11、ion 1 7 Marking 1 Appendix A Recommendations for the grouting of foundation bolts used in conjunction with levelling screw/holding down bolts 4 Figure 1 Levelling screw assembly 2 Figure 2 Levelling screw, locknut and seating plate 2 Figure 3 Examples of installed levelling screw assemblies 5 Table
12、1 Dimensions of levelling screws, locknuts and seating plates 3 Publications referred to Inside back coverBS4185-9:1976 ii BSI 11-1999 Foreword This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee. It is based on a draft prepared by t
13、he Machine Tool Trades Association and is one of a series which deals with machine tool components. During the preparation of this standard a number of different methods of levelling and holding down machine tools were reviewed. It became apparent that their design had been based on differing princi
14、ples, some for example incorporated principles which would increase the bed stiffness, others were based on the design of a particular machine, and others for cheapness or ease of installation. This standard relates to a type of combined levelling screw/holding down bolt which is principally designe
15、d for use on machine tools where precision levelling is required and where an improvement in bed stiffness is highly desirable. Examples of the type of machine for which the foundation equipment has been principally designed would be: milling/boring machines, long bed lathes, large or long bed milli
16、ng machines, machining centres and vertical boring mills. Research work on foundation design and methods of attaching machines to foundations carried out by the Machine Tool Industry Research Association has shown that significant improvements in bed stiffness can be achieved with the use of coaxial
17、 levelling screw/holding down bolts when used with properly designed machine flanges and foundations. The combined levelling screw/holding down bolts covered by this standard eliminate those bending stresses put on the machine base or flange by the more common arrangement of separate levelling screw
18、s and foundation bolts. It should be noted that some extra care may be required in the preparation of the foundation and the accuracy of the positioning of bolts when combined bolts are used. However to give guidance on grouting in the foundation bolts, some recommendations have been included asAppe
19、ndix A. See also CP2012 “Code of practice for foundations for machinery”. To increase the adaptability of the screws a number of alternative features have been included. However, in the interests of standardization, these should be treated as second choice items and would be subject to agreement bet
20、ween the user and the manufacturer. 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 confer immunity from legal obligations. Summa
21、ry of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to6, 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 in the amendment table on the inside front c
22、over.BS4185-9:1976 BSI 11-1999 1 1 Scope This standard specifies dimensions and materials for a metric series of levelling screws, which are intended for use in conjunction with foundation bolts (sometimes known as holding down bolts) (seeFigure 1), and their related locknuts and seating plates. It
23、also provides for alternative designs of levelling screw and locknut. This standard does not specify any details of the associated foundation bolts other than their nominal diameter. To facilitate the proper installation of the levelling screws, recommendations are given as to the thickness of flang
24、e in which they should be used (seeTable 1). Recommendations for grouting foundation bolts are given inAppendix A. Guidance is given as to the maximum recommended static load for the levelling screws (seeTable 1). 2 References The titles of the British Standards referred to in this standard are list
25、ed on the inside back cover. 3 Material It is recommended that the levelling screws, locknuts and seating plates should be manufactured from low carbon free cutting steel220 MO7 complying with the requirements of BS970-1 or from steel having equivalent mechanical properties. 4 Dimensions 4.1 General
26、. Dimensions of levelling screws, locknuts and seating plates shall be as specified inTable 1. 4.2 Thread. The thread of the levelling screws and locknuts shall be of a constant pitch of1.5mm complying with the requirements of BS3643-3, and shall be to the “medium fit” class of tolerance. 4.3 Altern
27、ative features. The alternative features given below should be considered as second choice and subject to agreement between the user and the manufacturer. a) In applications where only levelling is required, the centre clearance hole may be omitted from the levelling screw and the end fully radiused
28、. b) In cases where machine design inhibits use of tubular box spanners for tightening the locknut, the design of the locknut may incorporate tommy holes or slots for hook spanners. c) When a large seating area is required due to the type of flooring or foundation, an additional rectangular plate me
29、asuring150mm 200mm 12mm should be used beneath the seating plate specified inTable 1. 5 Finish All surfaces shall be free from burrs, sharp edges and other defects. 6 Designation Levelling screws, locknuts and seating plates complying with requirements of this standard shall be designated by the nom
30、inal diameter of the foundation bolt, the thread size of the levelling screw and the number of this standard e.g.: Modified locknuts as mentioned in4.3 b) should be designated as: locknuts (slotted) or locknuts (with tommy holes) NOTESeating plates may be round or square. 7 Marking Levelling screws,
31、 locknuts and seating plates conforming to this standard shall be marked by the manufacturer with the nominal size of the foundation bolt, the thread size of the levelling screw and number of this standard, e.g.: 24 M55 1.5 BS 4185-9. a) levelling screw: 24 M55 1.5 BS 4185-9; b) locknut: 24 M55 1.5
32、BS 4185-9; c) seating plate (round): 24 M55 1.5 BS 4185-9; d) large seating plate: 24 M55 1.5 BS 4185-9.BS4185-9:1976 2 BSI 11-1999 Figure 1 Levelling screw assembly (a) Levelling screw (b) Locknut (c) Seating plate Figure 2 Levelling screw, locknut and seating plateBS 4185-9:1976 BSI 11-1999 3 Tabl
33、e 1 Dimensions of levelling screws, locknuts and seating plates (seeFigure 2) All dimensions in millimetres except where stated Designation a Thread size to BS 3643-3 Levelling screw Lock nut Seating plate Flange thickness Maximum load per screw A B C c D E F G H J K L M b N P R S d Steel Cast iron
34、kg 16/M30 1.5 M30 1.5 30 20 90 12 5.0 70 5 25 27.7 22 46 12 16 30 100 30 40 1600 20/M40 1.5 M40 1.5 41 25 110 14 5.0 85 5 35 37.7 30 60 16 16 40 100 40 50 2500 24/M55 1.5 M55 1.5 55 30 120 e 16 5.0 90 e 5 50 52.7 40 75 16 20 58 150 55 70 5000 30/M75 1.5 M75 1.5 75 38 150 e 20 5.0 113 e 5 70 72.7 55
35、100 20 25 80 150 75 90 10000 a Nominal size of foundation bolt/size of levelling screw thread. b Dimensions of hexagon comply with the requirements of BS 3692. c May be omitted for levelling screws only see4.3 a). d Standard seating plates may be square or round. Where a larger seating area is requi
36、red use an additional seating plate of150mm 200mm 12mm thick. e Length of threaded portion should be increased by20mm when used in cast iron flanges.BS4185-9:1976 4 BSI 11-1999 Appendix A Recommendations for the grouting of foundation bolts used in conjunction with levelling screw/holding down bolts
37、 It is recognized that there are a number of methods for grouting foundation bolts into the machine foundations, these being dependent upon design of machine, type of foundation bolt used and individual company policy. The recommendations given below should not be used in place of the manufacturers
38、instructions. They are given as a guide to show the general principles of how the foundation bolts used in conjunction with levelling screw/holding down bolts may be grouted into position. Technical details for the design and construction of machine foundations may be found in the series of publicat
39、ions “Notes for designers” published by the Machine Tool Industry Research Association. The holes or pockets in which the foundation bolts will be fixed should either be drilled or cast in the concrete foundation. Their shape may be basically round or square. The size of the holes will depend on siz
40、e of machine and type of bolt but will have a generous clearance around the bolt. Holes of100mm to200mm square side or diameter are quite normal. Some designers of foundations call for the holes to be tapered outwards towards the bottom to improve keying, others have holes which taper inwards to mak
41、e the filling of the hole easier. All facilities should be made to make filling of the hole as easy as possible and it is recommended that the provision of a filling slot is made on one side of the hole seeFigure 3(a). Following completion of the holes the foundation bolts of the type shown inFigure
42、 3(b) should be assembled in the following manner. Place large washer or plate on head of foundation bolt. Insert the bolt through a length of tube of such a diameter to provide a generous clearance around the bolt and fill tube with dry sand. Place seating plate on foundation bolt. Lower machine in
43、to position on to a number of thick wooden boards, pass bolt through levelling screw and engage nut with the top of bolt sufficiently to hold bolt in place. Ensure tube is level with top of hole and fill holes with a suitable non-shrink grouting material. When grout is dry, remove boards, level mach
44、ine and tighten foundation bolts. For foundation bolts of the ragbolt or fir tree type, seeFigure 3(a), the bolts should be placed in the holes and the machine lowered into position onto thick wooden boards and the bolts loosely fixed to the levelling screws. Fill holes with a suitable non-shrink gr
45、outing material and proceed as in previous method.BS4185-9:1976 BSI 11-1999 5 Figure 3 Examples of installed levelling screw assemblies6 blankBS4185-9:1976 BSI 11-1999 Publications referred to This standard makes reference to the following British Standards: BS 970, Specification for wrought steels
46、for mechanical and allied engineering purposes. BS 970-1, General inspection and testing procedures and specific requirements for carbon, carbon manganese, alloy and stainless steels. BS 3643, ISO metric screw threads. BS 3643-3, Limits and tolerances for fine pitch threads (constant pitch series).
47、BS 3692, ISO metric precision hexagon bolts, screws and nuts. BS 4185-9: 1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the internation
48、al level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would
49、be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be
