1、BRITISH STANDARD BS1983-3: 1987 Chucks for machine tools and portable power tools Part3: Specification for dimensions of collet pads for base jaws of power operated workholding chucks UDC621.9.022229.323BS1983-3:1987 This British Standard, having been prepared under the directionof the Machine, Engi
2、neers and Hand Tools Standards Committee, was published under the authority ofthe Board of BSI and comesintoeffect on 29May1987 BSI09-1999 The following BSI references relate to the work on this standard: Committee reference MTE/1 Draft for comment85/79572 DC ISBN 0 580 15923 X Committees responsibl
3、e for this British Standard The preparation of this British Standard was entrusted by the Machine, Engineers and Hand Tools Standards Committee (MTE/-) to Technical Committee MTE/1 upon which the following bodies were represented: Advanced Manufacturing Technology Research Institute Cranfield Instit
4、ute of Technology Department of Trade and Industry Mechanical Engineering and Manufacturing Technology Division (Mmt) Federation of British Engineers Tool Manufacturers Health and Safety Executive Institution of Production Engineers Ministry of Defence University of Aston in Birmingham The following
5、 body was also represented in the drafting of the standard, through subcommittees and panels: Portable Electric Tool Manufacturers Association Amendments issued since publication Amd. No. Date of issue CommentsBS1983-3:1987 BSI 09-1999 i Contents Page Committees responsible Inside front cover Forewo
6、rd ii 1 Scope 1 2 Definition 1 3 Dimensions 1 4 Accuracy requirements 1 Figure 1 Collet pad mounting; typical assembly(165mm dia. chuck) 2 Figure 2 Collet pad and seating arrangement in base jaw 3 Figure 3 Seating of collet pads in the chuck 5 Table 1 Dimensions of collet pads and their seating dime
7、nsions in base jaws 4 Table 2 Accuracy of seating in the chuck to accept collet pads 5 Publication referred to Inside back coverBS1983-3:1987 ii BSI 09-1999 Foreword This Part of BS1983 has been prepared under the direction of the Machine, Engineers and Hand Tools Standards Committee. There are seve
8、ral UK chuck manufacturers providing collet pads which have become popular in the last few years. It was considered that standardization of the pad interface with the chuck base jaw is most desirable in the interests of interchangeability. This standard whilst in metric units is based on North Ameri
9、can practice which was considered to reflect the most common usage. 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 immuni
10、ty from legal obligations. Summary 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 amend
11、ment table on the inside front cover.BS1983-3:1987 BSI 09-1999 1 1 Scope This Part of BS1983 specifies dimensions of collet pads which are intended for fitting to the base jaws of power operated workholding chucks in place of the normal gripping jaws. Two classes of accuracy for seating in the chuck
12、 are specified; high precision and normal accuracy. NOTEThe title of the publication referred to in this standard is given on the inside back cover. 2 Definition For the purposes of this Part of BS1983 the following definition applies. collet pad a segment of a cylinder fitted to each base jaw of a
13、chuck (in place of the normal top jaw) so that when the chuck is closed the set of segments will grip the bar stock or other appropriate components (seeFigure 1) NOTE 1Collet pads are normally provided only for three jaw power chucks. NOTE 2The bar stock may be round, hexagonal, square or even of sp
14、ecial form. NOTE 3The jaw insert system provides a more accurate method of clamping with an increased resistance to “push back”. It is necessary therefore that the jaw system be shaped to locate the insert pad accurately both radially and axially. Some method of retention is required until the bar i
15、s inserted in the bore. It is commonly accepted that the better form of chuck jaw insert is the type which fits directly to the inner end of a chuck base jaw so that there is a direct line of action for the clamping force. 3 Dimensions Dimensions shall comply with those given in Table 1. NOTEParticu
16、lar collet pad sizes have not been related to given chuck sizes. The manufacturer should therefore select the collet pad size to suit the bore of the chuck. 4 Accuracy requirements Accuracy requirements shall comply with those given in Table 2. BS 1983-3:1987 2 BSI 09-1999 Figure 1 Collet pad mounti
17、ng; typical assembly(165mm dia. chuck)BS1983-3:1987 BSI 09-1999 3 Figure 2 Collet pad and seating arrangement in base jawBS1983-3:1987 4 BSI 09-1999 Table 1 Dimensions of collet pads and their seating dimensions in base jaws (see Figure 2) Maximum bar capacity of chuck 40mm dia. 50mm dia. 60mm dia.
18、75mm dia. 100mm dia. Base jaw dia. A (tolerance H7) a max. mm 47.650 mm 60.355 mm 76.236 mm 88.936 mm 127.041 min. 47.625 60.325 76.200 88.900 127.000 dia. B min. 51.5 64.5 80.5 93 132 C max. 11.176 15.95 15.95 15.95 12.776 min. 11.125 15.90 15.90 15.90 12.725 D 10.3 7.5 9.5 16 16 E 5.5 7.9 7.9 7.9
19、6.4 F min. 9.5 15 15 15 23.6 Collet pad dia. a (tolerance h7) a max. 47.625 60.325 76.200 88.900 127.00 min. 47.600 60.295 76.164 88.864 126.959 dia. b 50.8 63.5 79.4 92 131 c max. 11.049 15.824 15.824 15.824 12.649 min. 10.973 15.748 15.748 15.748 12.573 d 15.5 14.25 14.25 20.5 22 e 5.5 7.9 7.9 7.9
20、 6.4 f 8.5 14.3 14.3 14.3 22 g 34 39 45 54 59 thread size b M8 M8 M10 M10 M10 a See BS4500-1. b It is important that the fixing thread sizes are marked on the collet pad by the collet pad manufacturer.BS1983-3:1987 BSI 09-1999 5 Table 2 Accuracy of seating in the chuck toaccept collet pads (see Figu
21、re 3) Figure 3 Seating of collet pads in the chuck Concentricity reading High precision class Normal accuracy class dia. A mm 0.025 mm 0.075 dia. B 0.05 0.1256 blankBS1983-3:1987 BSI 09-1999 Publication referred to BS4500, Specification for ISO limits and fits. BS4500-1, General, tolerances and devi
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