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AS NZS 24381-1994 Drills and reamers Specification for twist drills

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AS NZS 24381-1994 Drills and reamers Specification for twist drills Powered By Docstoc
					                                                                                                              AS/NZS 2438.1:1994




                                                                                           Australian/New Zealand Standard
This is a free 6 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                           Drills and reamers

                                                                                           Part 1: Specification for twist drills
                                                                                                            AS/NZS 2438.1:1994

                                                                                                            This Joint Australian/New Zealand Standard was prepared by Joint Technical
                                                                                                            Committee ME/10, Small Tools. It was approved on behalf of the Council of Standards
                                                                                                            Australia on 18 February 1994 and on behalf of the Council of Standards New Zealand
                                                                                                            on 28 March 1994. It was published on 16 May 1994.




                                                                                                            The following interests are represented on Committee ME/10:

                                                                                                            Australian Chamber of Commerce and Industry
                                                                                                            CSIRO, Division of Manufacturing Technology
                                                                                                            Deakin University
                                                                                                            Department of Defence
                                                                                                            Fasteners Institute of Australia
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                                                                                                            Metal Trades Industry Association of Australia
                                                                                                            New South Wales TAFE Commission
                                                                                                            Railways of Australia Committee
                                                                                                            Society of Automotive Engineers—Australasia
                                                                                                            Telecom Australia
                                                                                                            WorkCover Authority of N.S.W.




                                                                                                            Review of Standards. To keep abreast of progress in industry, Joint Australian/
                                                                                                            New Zealand Standards are subject to periodic review and are kept up to date by the
                                                                                                            issue of amendments or new editions as necessary. It is important therefore that
                                                                                                            Standards users ensure that they are in possession of the latest edition, and any
                                                                                                            amendments thereto.
                                                                                                            Full details of all Joint Standards and related publications will be found in the
                                                                                                            Standards Australia and Standards New Zealand Catalogue of Publications; this
                                                                                                            information is supplemented each month by the magazines ‘The Australian Standard’
                                                                                                            and ‘Standards New Zealand’, which subscribing members receive, and which give
                                                                                                            details of new publications, new editions and amendments, and of withdrawn
                                                                                                            Standards.
                                                                                                            Suggestions for improvements to Joint Standards, addressed to the head office of either
                                                                                                            Standards Australia or Standards New Zealand, are welcomed. Notification of any
                                                                                                            inaccuracy or ambiguity found in a Joint Australian/New Zealand Standard should be
                                                                                                            made without delay in order that the matter may be investigated and appropriate action
                                                                                                            taken.




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                                                                                                                                           AS/NZS 2438.1:1994




                                                                                           Australian/New Zealand Standard
This is a free 6 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                           Drills and reamers

                                                                                           Part 1: Specification for twist drills




                                                                                             Australia
                                                                                             First published in Australia as AS B45.1— 1960 (being
                                                                                               endorsement of BS 328.1:1959 without amendment).
                                                                                             Revised and redesignated AS 2438— 1981.

                                                                                             New Zealand
                                                                                             First published in New Zealand as NZ 536:1962.
                                                                                             Revised and redesignated NZS/BS 328.1:1984.
                                                                                             Second edition 1986.
                                                                                             Jointly revised and redesignated as Joint Standard
                                                                                               AS/NZS 2438.1:1994.

                                                                                             Incorporating:
                                                                                             Amdt 1—1996
                                                                                             Amdt 2—1996




                                                                                           PUBLISHED JOINTLY BY:

                                                                                           STANDARDS AUSTRALIA
                                                                                           1 The Crescent,
                                                                                           Homebush NSW 2140 Australia
                                                                                           STANDARDS NEW ZEALAND
                                                                                           Level 10, Standards House,
                                                                                           155 The Terrace,
                                                                                           Wellington 6001 New Zealand
                                                                                                                                                     ISBN 0 7262 8838 1
                                                                                                                                              2

                                                                                                                                        PREFACE

                                                                                           This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee
                                                                                           ME/10 on Small Tools to supersede NZS/BS 328.1:1986, Drills and reamers, Part 1: Specification
                                                                                           for twist drills, and AS 2438 — 1981, Twist drills (general purpose) . This Standard is identical with
                                                                                           and has been reproduced from BS 328.1:1993, Drills and reamers, Part 1: Specification for twist
                                                                                           drills.
                                                                                           With the exception of the imperial size extra long drills the dimensions of drill diameters, lengths
                                                                                           and tolerances given in this Standard are in accordance with the following International Standards:
                                                                                           ISO
                                                                                           235:1980     Parallel shank jobber and stub series drills and Morse taper shank drills
                                                                                           494:1975     Parallel shank twist drills — Long series
                                                                                           3291:1975    Extra long Morse taper shank twist drills
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                                                                                           3292:1975    Extra long parallel shank twist drills
                                                                                           The flute lengths, overall lengths and design parameters specified in this Standard have been arrived
                                                                                           at after full discussions at international level.
                                                                                           In addition to tabulating the preferred sizes in which metric drills and imperial drills will normally
                                                                                           be available, comprehensive general tables are given for each type of drill so that preferred shank,
                                                                                           flute and overall dimensions can be determined for drills with non-listed diameters.
                                                                                           For the purpose of this Joint Australian/New Zealand Standard, references to other publications
                                                                                           should be replaced by references to Australian or New Zealand Standards as follows:
                                                                                           References to other publications                       Australian/New Zealand Standards
                                                                                           BS                                                     AS
                                                                                           240     Method for Brinell hardness test and for       1816   Metallic material —Brinell hardness test
                                                                                                   verification of Brinell hardness testing
                                                                                                   machines
                                                                                           1660   Machine tapers                                  —
                                                                                           1660.1 Part 1: Specification for shanks and
                                                                                                  sockets with self-holding tapers (Morse
                                                                                                  and metric 5%)
                                                                                           4490    Methods for micrographic determination         —
                                                                                                   of the grain size of steel
                                                                                           4500    ISO limits and fits                            1654   Limits and fits for engineering (metric
                                                                                                                                                         units)

                                                                                                                                                  NZS/ISO
                                                                                                                                                  286   ISO system of limits and fits
                                                                                           4500.1 Par t 1: G ener al toler ances and                    Part 1: Bases of tolerances, deviations
                                                                                                  deviations                                            and fits
                                                                                                  Section 1.1: Specification for bases of               Part 2: Tables of standard tolerance
                                                                                                  tolerances, deviation and fits                        grades and limit deviations for holes
                                                                                                  Section 1.2: Tables of commonly used                  and shafts
                                                                                                  tolerance and grades and limits
                                                                                                  deviations for holes and shafts
                                                                                           ISO                                                    AS
                                                                                           4957    Tool steels                                    1239   Steel —Schedule of tool     steel com-
                                                                                                                                                         positions
                                                                                                                                       3

                                                                                                                                CONTENTS

                                                                                                                                                                      Page
                                                                                           Specification
                                                                                           1       Scope                                                               4
                                                                                           2       References                                                          4
                                                                                           3       Definitions                                                         4
                                                                                           4       Dimensions                                                          7
                                                                                           5       Features of design                                                  7
                                                                                           6       Materials and hardness                                             10
                                                                                           7       Marking                                                            10
                                                                                           8       Performance                                                        11
                                                                                           Annex
                                                                                           A     (normative) Method of test                                           34
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                                                                                           Tables
                                                                                           1         Parallel shank jobber series twist drills. Preferred sizes       14
                                                                                           2         Parallel shank stub series twist drills. Preferred sizes         16
                                                                                           3         Parallel shank long series twist drills. Preferred sizes         18
                                                                                           4         Parallel shank extra long series twist drills. Preferred sizes   20
                                                                                           5         Morse taper shank twist drills. Preferred sizes                  22
                                                                                           6         Morse taper shank extra long twist drills. Preferred sizes       26
                                                                                           7         Parallel shank jobber series twist drills. General sizes         28
                                                                                           8         Parallel shank stub series twist drills. General sizes           29
                                                                                           9         Parallel shank long series twist drills. General sizes           30
                                                                                           10        Morse taper shank twist drills. General sizes                    31
                                                                                           11        Limits of tolerance on diameter                                  33
                                                                                           12        Flute length l of Morse taper shank extra long twist drills      33
                                                                                           13        Limits of tolerance on overall length and flute length           33
                                                                                           14        Material – cutting portion only                                  33
                                                                                           A.1       Table of penetrations (metric)                                   34
                                                                                           A.2       Table of penetrations (imperial)                                 34
                                                                                           Figures
                                                                                           1         Twist drill terms. General features                               5
                                                                                           2         Twist drill terms. Point geometry                                 6
                                                                                           3         Normal lead and helix                                             7
                                                                                           4         Shorter lead and quicker helix                                    7
                                                                                           5         Longer lead and slower helix                                      7
                                                                                           6         Minimum web thickness                                             8
                                                                                           7         Tolerance on web centrality                                       8
                                                                                           8         Maximum permissible variation in flute divide                     9
                                                                                           9         Land width                                                       10
                                                                                           10        Difference in height of major cutting edges                      11
                                                                                           11        Radial runout tolerance                                          12
                                                                                           12        Parallel shank jobber series twist drills                        14
                                                                                           13        Parallel shank stub series twist drills                          16
                                                                                           14        Parallel shank long series twist drills                          18
                                                                                           15        Parallel shank extra long series twist drills                    20
                                                                                           16        Morse taper shank twist drills                                   22
                                                                                           17        Morse taper shank extra long twist drills                        26
                                                                                           A.1       Penetration rates (metric)                                       35
                                                                                           A.2       Penetration rates (imperial)                                     36
                                                                                           List of references                                                         37
                                                                                                                                                                     4


                                                                                                                  STANDARDS AUSTRALIA / STANDARDS NEW ZEALAND

                                                                                                                                      Australian/New Zealand Standard
                                                                                                                                                    Drills and reamers

                                                                                                                                      Part 1: Specification for twist drills



                                                                                           1     Scope                                                                   3.1.3 parallel shank long series twist drill
                                                                                           This Part of BS 328 specifies requirements for the                            A lengthened form of the parallel shank jobber series
                                                                                           dimensions, design, materials, hardness values and                            twist drill, the increase in length being in the flute
                                                                                           performance for twist drills made of high-speed steel                         length.
                                                                                           with either parallel or Morse taper shanks.                                   3.1.4 parallel shank extra long series twist drill
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                                                                                           A method of test for the drills specified is given in                         A lengthened form of the parallel shank jobber series
                                                                                           annex A.                                                                      twist drill, longer than the long series, the increase in
                                                                                           NOTE. The requirements in this standard may also form the basis               length being in the flute length.
                                                                                           for the specification of special purpose twist drills as agreed between       3.1.5 Morse taper shank twist drill
                                                                                           the buyer and supplier.
                                                                                                                                                                         A drill having two helical flutes and a standard Morse
                                                                                           This British Standard is not applicable to woodworking
                                                                                                                                                                         taper shank.
                                                                                           or do-it-yourself (D.I.Y) drills. Its use is for drills
                                                                                           manufactured for general engineering applications.                            3.1.6 Morse taper shank extra long twist drill
                                                                                                                                                                         A lengthened form of the Morse taper shank twist
                                                                                                                                                                         drill, the increase in length being in the flute length.
                                                                                           2 References
                                                                                                                                                                         3.2   Other terms
                                                                                           2.1    Normative references
                                                                                                                                                                         3.2.1 axis
                                                                                           This part of BS 328 incorporates, by reference,
                                                                                           provisions from specific editions of other publications.                      The longitudinal centreline.
                                                                                                                                                                           NOTE. See figure 1.
                                                                                           These normative references are cited at the appropriate
                                                                                           points in the text and the publications are listed on                         3.2.2 back taper (longitudinal clearance)
                                                                                           page 37. Subsequent amendments to, or revisions of,                           The reduction in diameter per unit length of drill from
                                                                                           any of these publications apply to this Part of BS 328                        the point towards the shank.
                                                                                           only when incorporated in it by updating or revision.
                                                                                                                                                                         3.2.3 body
                                                                                           2.2    Informative references
                                                                                                                                                                         The portion of a drill extending from the extreme
                                                                                           This Part of BS 328 refers to other publications that                         cutting end to the commencement of the shank.
                                                                                           provide information or guidance. Editions of these                              NOTE. See figure 1.
                                                                                           publications current at the time of issue of this
                                                                                           standard are listed on the inside back cover, but                             3.2.4 body clearance
                                                                                           reference should be made to the latest editions.                              The portion of the body surface reduced in diameter to
                                                                                                                                                                         provide diametral clearance.
                                                                                                                                                                           NOTE. See figure 1.
                                                                                           3 Definitions
                                                                                                                                                                         3.2.5 body clearance diameter
                                                                                           For the purposes of this Part of BS 328 the following
                                                                                                                                                                         The diameter over that surface of the drill body
                                                                                           definitions apply.                                                            situated behind the lands.
                                                                                           3.1    Types of twist drill                                                     NOTE. See figure 2.
                                                                                           3.1.1 parallel shank jobber series twist drill                                3.2.6 chisel edge
                                                                                           A drill having two helical flutes and a parallel shank                        The edge formed by the intersection of the flanks.
                                                                                           of approximately the same diameter as the cutting end.                          NOTE. See figure 2.
                                                                                           3.1.2 parallel shank stub series twist drill                                  3.2.7 chisel edge angle
                                                                                           A shortened form of parallel shank jobber series twist                        The obtuse angle included by the chisel edge and a
                                                                                           drill, the reduction in length being in the flute length.                     line from either outer corner to the corresponding end



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                                                                                                             AS/NZS 2438.1:1994, Drills and reamers
                                                                                                             Specification for twist drills
This is a free 6 page sample. Access the full version at http://infostore.saiglobal.com.




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