1、BRITISH STANDARD CONFIRMED MARCH 1990 BS 328-3: 1983 Drills and reamers Part 3: Specification for the dimensions of core drills UDC 621.951.456BS328-3:1983 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, was published underthe authori
2、ty of the BoardofBSI and comes intoeffecton 31October1983 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference MEE/73 Draft for comment 83/71929 DC ISBN 0 580 13474 1 Committees responsible for this British Standard The preparation of this British Standar
3、d was entrusted by the Mechanical Engineering Standards Committee (MEE/-) to Technical Committee MEE/73 upon which the following bodies were represented: Gauge and Tool Makers Association Institution of Production Engineers Machine Tool Industry Research Association Society of British Aerospace Comp
4、anies Limited Twist Drill and Reamer Association Amendments issued since publication Amd. No. Date of issue CommentsBS328-3:1983 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope and field of application 1 2 Reference 1 3 Core drills with parallel shanks 1 4 C
5、ore drills with Morse taper shanks 3 5 Core drills for pre-finishing operations 5 Publications referred to Inside back coverBS328-3:1983 ii BSI 10-1999 Foreword This Part of BS328,which is published under the direction of the Mechanical Engineering Standards Committee, is technically equivalent to I
6、SO 7079:1981 “Core drills with parallel shanks and with Morse taper shanks” published by the International Organization for Standardization (ISO). The only significant change to the ISO text is in the symbols used for the lengths of the drills; ISO7079uses l for the overall length and l 1for the flu
7、te length while, to maintain conformity with the other Parts of BS 328, this part uses L and l. For ease of reproduction the text of the International Standard has been used for this British Standard. Some terminology and certain conventions are not identical with those used in British Standards; at
8、tention 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. Cross-reference. There is no British Standard corresponding exactly to ISO296:1974, to which reference is
9、made in the text (and see clause 2). For the purposes of this standard the British Standard corresponding to ISO 296 is BS1660, “Machine tapers, reduction sleeves and extension sockets”. For an explanation of the ISO system of limits and fits, including the meaning of the symbol h8 (see the tables i
10、n 3.1 and 4.1), see BS 4500 “ISO limits and fits” Part1 “General, tolerances and deviations”. 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 n
11、ot of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This w
12、ill be indicated in the amendment table on the inside front cover.BS328-3:1983 BSI 10-1999 1 1 Scope and field of application This British Standard specifies the dimensions of core drills with parallel shanks and with Morse taper shanks. It includes two tables for each of the above specified types,
13、giving respectively: the dimensions for the preferred diameters and the corresponding lengths defined in terms of diameter ranges. The tables show only metric dimensions which are alone recommended in the future for this type of drill. Unless otherwise stated, these drills will be right-hand cutting
14、 drills. 2 Reference ISO 296, Machine tools Self-holding tapers for tool shanks. 3 Core drills with parallel shanks 3.1 Dimensions for the preferred diameters NOTE 1Intermediate sizes Dimensions in millimetres d h8 l L d h8 l L 3,00 33 61 10,75 3,30 36 65 11,00 94 142 3,50 39 70 11,75 3,80 43 75 12,
15、00 4,00 12,75 101 151 4,30 47 80 13,00 4,50 13,75 108 160 4,80 52 86 14,00 5,00 14,75 114 169 5,80 57 93 15,00 6,00 15,75 120 178 6,80 69 109 16,00 7,00 16,75 125 184 7,80 75 117 17,00 8,00 17,75 130 191 8,80 81 125 18,00 9,00 18,70 135 198 9,80 87 133 19,00 10,00 19,70 140 205BS328-3:1983 2 BSI 10-
16、1999 When intermediate sizes are needed, reference should be made to the general table in 3.2 for the corresponding lengths. NOTE 2Flute portion Tolerance on diameter d measured near the point: h8. Back taper: at the manufacturers discretion. NOTE 3Shank These drills are normally made without drivin
17、g tenon. NOTE 4Tolerance on lengths See general table in 3.2. 3.2 General table: Corresponding lengths set out as a function of diameter ranges NOTETolerance on lengths Lengths L and l may vary, within one diameter range, between the minimum and maximum limits corresponding respectively to the figur
18、es given for the nearest lower or upper range. Example: For diameter4mm, length l may vary between39and47mm about nominal value43mm, and length L may vary between70and80about nominal value75mm. Dimensions in millimetres Diameter ranges d Corresponding lengths over up to and including l L 3,00 33 61
19、3,00 3,35 36 65 3,35 3,75 39 70 3,75 4,25 43 75 4,25 4,75 47 80 4,75 5,30 52 86 5,30 6,00 57 93 6,00 6,70 63 101 6,70 7,50 69 109 7,50 8,50 75 117 8,50 9,50 81 125 9,50 10,60 87 133 10,60 11,80 94 142 11,80 13,20 101 151 13,20 14,00 108 160 14,00 15,00 114 169 15,00 16,00 120 178 16,00 17,00 125 184
20、 17,00 18,00 130 191 18,00 19,00 135 198 19,00 20,00 140 205BS328-3:1983 BSI 10-1999 3 4 Core drills with Morse taper shanksBS328-3:1983 4 BSI 10-1999 4.1 Dimensions for the preferred diameters NOTE 1Intermediate sizes When intermediate sizes are needed, reference should be made to the general table
21、 in 4.2 for the corresponding lengths. NOTE 2Flute portion Tolerance on diameter d measured near the point: h8. Back taper: at the manufacturers discretion. NOTE 3Shank In accordance with ISO 296. NOTE 4Tolerance on lengths Dimensions in millimetres d h8 l L Morse taper No. d h8 l L Morse taper No.
22、7,80 75 156 23,70 160 281 8,00 24,00 8,80 81 162 24,70 9,00 25,00 9,80 87 168 25,70 165 286 3 10,00 26,00 10,75 27,70 170 291 11,00 94 175 1 28,00 11,75 29,70 175 296 12,00 30,00 12,75 101 182 31,60 185 306 13,00 32,00 185 334 13,75 108 189 33,60 190 339 14,00 34,00 14,75 114 212 34,60 15,00 35,00 1
23、5,75 120 218 35,60 195 344 16,00 36,00 16,75 125 223 37,60 200 349 17,00 38,00 17,75 130 228 39,60 18,00 40,00 18,70 135 233 2 41,60 205 354 4 19,00 42,00 19,70 140 238 43,60 210 359 20,00 44,00 20,70 145 243 44,60 21,00 45,00 21,70 150 248 45,60 215 364 22,00 46,00 22,70 155 253 47,60 220 369 23,00
24、 48,00 49,60 50,00BS328-3:1983 BSI 10-1999 5 See general table in 4.2. 4.2 General table: Corresponding lengths set out as a function of diameter ranges NOTETolerance on lengths Lengths L and l may vary, within one diameter step, between the minimum and maximum limits corresponding respectively to t
25、he figures given for the nearest lower or upper step (increased or reduced, as far as the total length is concerned, by the difference between the lengths of the two tapers, if the taper combined with one of the two adjacent steps is larger or smaller than that of the step in question). Example: For
26、 the diameter15mm, length l may vary between108 and120from the nominal value114mm, with a tolerance 6. As the tolerance for L is the same as that for l ( 6), L can vary between206and218from the nominal value212mm. 5 Core drills for pre-finishing operations The following amount of stock removal is re
27、commended and the diameters of the core drills should be calculated accordingly: Dimensions in millimetres Diameter ranges d Corresponding lengths Diameter ranges d Corresponding lengths over up to and including l L Morse taper No. over up to and including l L Morse taper No. 7,50 8,50 75 156 23,02
28、23,60 155 276 8,50 9,50 81 162 23,60 25,00 160 281 9,50 10,60 87 168 1 25,00 26,50 165 286 3 10,60 11,80 94 175 26,50 28,00 170 291 11,80 13,20 101 182 28,00 30,00 175 296 13,20 14,00 108 189 30,00 31,50 180 301 14,00 15,00 114 212 31,50 31,75 185 306 15,00 16,00 120 218 31,75 33,50 334 16,00 17,00
29、125 223 33,50 35,50 190 339 17,00 18,00 130 228 35,50 37,50 195 344 18,00 19,00 135 233 2 37,50 40,00 200 349 19,00 20,00 140 238 40,00 42,50 205 354 4 20,00 21,20 145 243 42,50 45,00 210 359 21,20 22,40 150 248 45,00 47,50 215 364 22,40 23,02 155 253 47,50 50,00 220 369 Dimensions in millimetres Di
30、ameters d Stock removal over up to and including 10 18 30 10 18 30 50 0,20 0,25 0,30 0,406 blankBS328-3:1983 BSI 10-1999 Publications referred to See foreword.BS 328-3: 1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for p
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