1、BRITISH STANDARD BS 1660-10: 1988 ISO 239:1974 Machine tapers Part 10: Specification for drill chuck tapers (Jacob and short Morse) ISO title: Drill chuck tapers UDC 621.9229.22.224:62229.323+(083.3)BS1660-10:1988 This British Standard, having been prepared under the directionof the Machine, Enginee
2、rs and Hand Tools Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 30September1988 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference MTE/7 Draft for comment 87/77517 DC ISBN 0 580 16643 0 Committees resp
3、onsible 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/7, upon which the following bodies were represented: Gauge and Tool Makers Association Institution of Production En
4、gineers Milling Cutter Association Twist Drill and Reamer Association Advanced Manufacturing Technology Research Institute Amendments issued since publication Amd. No. Date of issue CommentsBS1660-10:1988 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Sc
5、ope and field of application 1 2 Interchangeability 1 3 Morse taper type 1 4 Jacobs taper type 2BS1660-10:1988 ii BSI 10-1999 National foreword This Part of BS 1660 has been prepared under the direction of the Machine, Engineers and Hand Tools Standards Committee and is identical with ISO239:1974 “D
6、rill chuck tapers” which was prepared by Technical Committee ISO/TC29 of the International Organization for Standardization (ISO) and in the development of which the United Kingdom played an active part. In due course BS1983 “Specification for chucks for machine tools and portable power tools” Part1
7、 “Tool holding chucks”, which also contains requirements for drill chuck tapers will be withdrawn. Other Parts of BS1660 currently published are as follows. Part 1: Specification for shanks and sockets with self-holding tapers (Morse and metric 5%); Part 2: Specification for reduction sleeves and ex
8、tension sockets for tools with Morse taper shanks; Part 3: Specification for turret sockets and reduction sleeves with tapped ends for tools with Morse taper shanks; Part 4: Specification for spindle noses and tool shanks with self-release7/24 tapers; Part 5: Specification for adaptors with7/24 inte
9、rnal and external tapers; Part 6: Specification for adaptors with external7/24 tapers for tools with Morse taper shanks; Part 7: Specification for extension adaptors with external7/24 tapers for tools with Morse taper shanks; Part 8: Specification for collar dimensions for7/24 taper tool shanks and
10、equipment; Part 9: Specification for cotter slots. BS1660-1 to BS1660-10 collectively supersede BS 1660:1972 which is withdrawn. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology
11、 and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “Int
12、ernational Standard” appear, referring to this standard, they should be read as “British Standard”. Inch dimensions. In accordance with the UK policy of metrication, inch dimensions given in this standard are not used and are included for information purposes only. Additional information. The concen
13、tricity tolerance should be of AT4 quality as given in BS4500 “ISO limits and fits” Part5 “Systems of cone tolerances for conical workpieces from C = 1:3to1:500 and lengths from 6mm to 600mm” 1) 1) In preparation.BS1660-10:1988 BSI 10-1999 iii A British Standard does not purport to include all the n
14、ecessary 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. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pag
15、es1to 3 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 cover.iv blankBS1660-10:1988 BSI 10-1999 1 1 Scope and field of application This International Standard lays down
16、the dimensions of drill chuck tapers and includes two distinct types: 1) Morse taper type; 2) Jacobs taper type. It comprises, for each type of taper, two tables giving respectively the dimensions in millimetres and the corresponding dimensions in inches. 2 Interchangeability For each type of taper,
17、 Morse or Jacobs, complete interchangeability is assured between the two systems of units of measurement, millimetres and inches, as the dimensions expressed in any one system have been converted from those expressed in the other with sufficiently close approximation, having regard to the magnitude
18、of the tolerances. 2.1 Morse taper type The tapered portions are identical with the following Morse tapers: No. 1, for tapers B10 and B12; No. 2, for tapers B16 and B18; No. 3, for tapers B22 and B24. The length of each of these tapers is, of course, distinctly less than the overall length of the co
19、rresponding Morse taper; each taper may be regarded as corresponding approximately either to that part of the Morse taper nearest the small end (for example: B10), or to the part nearest the large end (for example: B12). 2.2 Jacobs taper type The tables in4.1 and4.2 merely reproduce and classify the
20、 normal dimensions of Jacobs tapers; they also observe the generally accepted designations, in spite of their somewhat illogical appearance. In effect, the range of increasing values for diameterD contains two 2 tapers, the first of which is a short taper 2, and between the tapers 2 and 3, there are
21、 two interpolated tapers which bear the out-of-series numbers 33 and 6 respectively. 3 Morse taper typeBS1660-10:1988 2 BSI 10-1999 3.1 Dimensions in millimetres 3.2 Dimensions in inches (The effective values are obtained by applying the rate of taper and the basic dimension D to the actual values o
22、f a and l 1respectively.) 4 Jacobs taper type Reference No. D D 1 a d a d 1 l 1 a max. b c Taper Morse No. on diameter B10 10,094 10,3 9,4 9,8 14,5 3,5 3,5 1,0 1 0,049 88 B12 12,065 12,2 11,1 11,5 18,5 B16 15,733 16,0 14,5 15,0 24,0 5,0 4,0 1,5 2 0,049 95 B18 17,780 18,0 16,2 16,8 32,0 B22 21,793 22
23、,0 19,8 20,5 40,5 5,0 4,5 2,0 3 0,050 20 B24 23,825 24,1 21,3 22,0 50,5 a D 1and d = calculated values given for information. Reference No. D D 1 a d a d 1 l 1 a max. b c Taper Morse No. on diameter B10 0.397 4 0.403 6 0.368 9 25 / 64 0.571 1 / 8 1 / 8 3 / 64 1 0.049 88 B12 0.475 0 0.481 2 0.438 7 2
24、9 / 64 0.728 B16 0.619 4 0.628 8 0.572 2 19 / 32 0.945 3 / 16 5 / 32 1 / 16 2 0.049 95 B18 0.700 0 0.709 4 0.637 1 21 / 32 1.260 B22 0.858 0 0.867 4 0.778 0 13 / 16 1.594 3 / 16 3 / 16 5 / 64 3 0.050 20 B24 0.938 0 0.947 4 0.838 2 7 / 8 1.988 a D 1and d = calculated values given for information.BS16
25、60-10:1988 BSI 10-1999 3 4.1 Dimensions in millimetres 4.2 Dimensions in inches Jacobs taper No. D d . l 1 Taper on diameter 0 6,350 5,802 11,112 0,049 29 1 9,754 8,469 16,669 0,077 09 2 short 13,940 12,386 19,050 0,081 55 2 14,199 12,386 22,225 0,081 55 33 15,850 14,237 25,400 0,063 50 6 17,170 15,
26、852 25,400 0,051 91 3 20,599 18,951 30,956 0,053 25 (4) 28,550 26,346 42,069 0,052 40 (5) 35,890 33,422 47,625 0,051 83 Sizes shown in brackets should be avoided whenever possible. Jacobs taper No. D d . l 1 Taper on diameter 0 0.250 0 0.228 4 0.437 50 0.591 45 1 0.384 0 0.333 4 0.656 25 0.925 08 2
27、short 0.548 8 0.487 6 0.750 00 0.978 61 2 0.559 0 0.487 6 0.875 00 0.978 61 33 0.624 0 0.560 5 1.000 00 0.761 94 6 0.676 0 0.624 1 1.000 00 0.622 92 3 0.811 0 0.746 1 1.218 75 0.638 98 (4) 1.124 0 1.037 2 1.656 25 0.628 86 (5) 1.413 0 1.316 1 1.875 00 0.620 10 Sizes shown in brackets should be avoid
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