Asme b94 11m 1993 scan (american society of mechanical engineers)

Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled when Twist Drills (REVISION OF ANSI B94.11-1979) The American Society of Mechanical Engineers 345 E a s t 47th Street, New York, N.Y 10017 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh AN AMERICAN NATIONAL STANDARD ASME B94.11M-1993 This Standard will be revised when the Society approves the issuance of a new edition There will be no addenda or written interpretations of the requirements p f this Standard issued to this Edition ASME is the registered trademark of The American Society of Mechanical Engineers This code or standard was developed under procedures accredited as meeting the criteria for American National Standards The ConsensusCommittee that approved the code or standard was balancedto assure that individuals from competent and concerned interests have had anopportunity to participate The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large ASME does not "approve," "rate," or "endorse" any item, construction, praprietary device, or activity ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent, nor assume any suchliability Users of a code or standard are expressly advisedthat determination of the validity of any such patent rights, andthe risk of infringement of such rights,is entirely their own responsibility Participation by federal agency representativek) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher Copyright 1994 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in USA Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh Date of Issuance: March 31, 1994 (This Foreword is not a part of ASME 894.1 1M-1993.) The U.S.A Standard Twist Drills-Straight Shank (USASI B5-12-1940) Standardized Drill Nomenclature and Major Dimensions, Technical Committee No on Twist Drills was established in 1946 and a revision dated March 22, 1950 was issued The committee was reactivated in 1956 and a revision dated December 15, 1958 was issued The committee was again reactivated in 1964 and a redesignated USAS B94.11-1967 was issued on May 4, 1967 The above standard was reaffirmed in 1972 as ANSI B94.11-1967 (R1972) Technical Committee No was again reactivated in March 1978 for the purpose of reviewing ANSI B94.11-1967 (R1972) and considered a proposed Inch and Metric Standard submitted by the Metal Cutting Tool Institute and industry thatreflects current U.S drill usage The proposal addedmetric sizes in jobbers series, screw machine series, taper length series, and taper'shank series that were reflective of current industry practices and usage patterns Metric sizes were not included for core drills, and combined drills and countersinks.In addition the entire standard was dual-dimensionedbecause of the metric additions The suggestions were reviewed and a draft was approved by the Technical Committee on November 15, 1978 for submission to sectional committee B94 and sponsor organizations of ANSI The revision was approved by the American National Standards Institute on August 29, 1979 and redesignated ANSI B94.11M-1979 Following the resignation and retirement of all but one of themembers of the Technical Committee No 7, new members were recruited so that revisions suggested by members of the United States Cutting Tool Institute could be considered A draft of the results of the committee's deliberations was approved by the commitee on February 28, 1991 In addition to dealingwith theUSCTI suggestions, thecommitteealso correctedmany numerical and editorial errors Other changes, designed to make this document easier to use, were also recommended The recommended revision was approved by the American National Standards Institute on September 29, 1993 and was redesignated ASMEB94.11M1993 111 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh FOREWORD (The following is the roster of the Committee at the time of approval of this Standard.) OFFICERS E J Czopor, Chairman E W McLaren, Secretary COMMITTEE PERSONNEL E J Czopor, E & S Sales, Inc., Bloomfield Hills, Michigan M E Merchant, Metcut Res Associates, Inc., Cincinnati, Ohio C W Preuss, Kingsford Broach and Tool, Inc., Westlake, Ohio J R Strolberg, Rockton, Illinois A M Bratkovich, Alternate, NMTBA, McLean, Virginia TECHNICAL COMMITTEE 7-TWIST DRILLS C T Wax, Chairman, Scully-Jones Corp., Chicago, Illinois P Field, Michigan Drill Co., Miami, Florida R C Gulbrandsen, Precision Twist Drill Co., Crystal Lake, Illinois M N Jarvis II, Jarvis Cutting Tools, Inc., Qochester, New Hampshire D L Lewis, Kennametal, Inc., Raleigh, North Carolina R E Moring, Greenfield Industries, Augusta, Georgia C W Preuss, Kingsford Broach and Tool, Inc., Westlake, Ohio D E Sister, Caterpillar, Inc., Aurora, Illinois V Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh ASME STANDARDS COMMITTEE B94 Standardization of Cutting Tools, Holders, Drivers and Bushings Foreword Standards Committee Roster Scope Twist Drills 2.1 Nomenclature and Definitions 2.2 Classifications Combined Drills and Countersinks 3.1 Nomenclature and Definitions 3.2 Applicable TwistDrill Terms Figures Identity ofTwistDrill Features Identity of Core Drill Features Identity of Combined Drill and Countersink Features Dimensions of Fractional Size Twist Drills - High Speed Steel (Silver and Deming Style) Tables General Dimensions of Straight Shank Twist Drills - Jobbers Length General Dimensions of Straight Shank Twist Drills - Taper Length A Through '/2 in (12.7 mm) Dia B Over '/2 in (12.7 mm) Dia General Dimensions of Straight Shank Twist Drills - Screw Machine Length A Through in (25.4 mm) Dia B Over in (25.4 mm) Dia General Dimensions of Tangs for Straight Shank Twist Drills General Dimensions of Taper Shank Twist Drills Specifications and Definitions for Split Point Drill Grinding General Dimensions of Three and Four Flute Straight Shank Core Drills General Dimensions of Three and Four Flute Taper Shank Core Drills A General Dimensions of Combined Drills and Countersinks (Plain and Bell Types) B Tolerances of Combined Drills and Countersinks 10 Element Tolerances for High Speed Steel General Purpose Twist Drills vii 111 V 1 3 49 16 21 25 33 34 35 48 50 52 54 55 56 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh CONTENTS TWIST DRILLS (Straight Shank and Taper Shank Combined Drills and Countersinks) SCOPE helix angle - the angle made by the leading edge of the land with a plane containing the axis of the drill ThisStandard coversnomenclature,definitions, sizes and tolerances of High Speed Steel, Straightand Taper Shank Drills, and Combined Drills and Countersinks, Plain and Bell Type It covers both inch and metric size drills land - the peripheral portion of the tween adjacent flutes land width - the distance between the leading edge and the heel of the land measured ata right angle to the leading edge TWIST DRILLS lips ( a ) two-flute drill - the cutting edges extending from the chisel edge to the periphery ( b ) three- orfour-flute drill (core drill) - the cutting edges extending from the bottom of the chamfer to the periphery 2.1NomenclatureandDefinitions axis - the imaginary straight line which longitudinal center line of the drill drill body be- forms the back taper - a slight decrease in diameterfrom point to back in the body of the drill lip relief - the axial relief on the drill point body - the portion of the drill extending from the shank or neck to the outer corners of the cutting lips lip relief angle - the axial relief angle at the outer corner of the lip It is measured across the margin portion of the land body diameter clearance - that portion of theland that has been cut away so it will not rub againt the walls of the hole margin - the cylindrical portion of the land which is not cut away to provide clearance chisel edge - the edge at the end of the web that connects the cutting lips neck - the section of reduced diameter between the body and the shank of a drill chisel edge angle - the angle included between the chisel edge and the cutting lipas viewed from the end of the drill overall length - the length from the extreme end of the shank to the outer corners of the cutting lips It does not include the conical shank end often used on straight shank drills, nor does it include the conical cutting point used on both straight and taper shank drills (For core drills with an external center on the cutting end, same as for two flute drills For core drills with internalcenters on the cutting end, the overall length is to the extreme ends of the tool.) clearance diameter - the diameter over the cut-away portion of the drill lands drill diameter - the diameterover the margins of the drill measured at the point flutes - helical or straight grooves cut or formed in the body of the drill to provide cutting lips,to permit removal of chips, and to allow cutting fluid to reach the cutting lips point - the cutting end of a drill, made up of the ends of the lands, the web, and the lips In form, it resembles a cone, but departs from a true cone to furnish clearance behind the cutting lips flute length - the length from the outer corners of the cutting lip to the extreme back end of the flutes It includes the sweep of the tool used to generate the flutes and, therefore, does not indicate the useable length of the flutes point angle - the angle included between the lips projected upon a plane parallel to the drill axis and parallel to the cutting lips Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh ASME 894.11M-1993 N b -Axis- b Taper shank - i n accordance with American National Standard 85.10 Machine Tapers FIG IDENTITY OF TWIST DRILLFEATURES ,Overall length4Body diameter clearance P m W Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w ASME 894.11M-1993 shank - the part of the drill by which it is held and driven COMBINED DRILLS AND COUNTERSINKS 3.1 Nomenclature and Definitions tang - the flattened end of a taper shank, intended to fit into a slot in the socket These definitions are applicable to Tables and 10 axis - the imaginary straight line which forms the longitudinal center line of the combined drill and countersink tang drive - two opposite parallel driving flats on the extreme end of a straight shank twist drill - a rotary end cutting tool having one or more cutting lips and having one or more helical or straight flutes for the passage of chips and the ad.mission of a cutting fluid back taper - a slight decrease in diameter from the front to back in the drill length bell angle- the included angle of the secondary conical section providing clearance or protection for the countersink angle conical surface (it is normally 120 deg.1 web - the central portion of the body that joins the lands The extreme end of the web forms the chisel edge on a two-flute drill bell diameter - the diameter at the intersection of the countersink portion and the bell portion at the leading edge of the land web thickness - the thickness of the web at the point unless another specific location is indicated web thinning - the operation of reducing the web thickness at the point to reduce drilling thrust body - the central portion of the body by which it is held or driven combined drill and countersink - single or doubleend cutting tool, having helical or straight flutes, and having a drill portion and an adjacent integral countersink portion, primarily used to produce center holes in work that will be held between machine centers 2.2 Classifications 2.2.1 Based on Kind of Shank straight shank drills -those having cylindrical shanks which may bethe same or different diameter than the body of the drill The shank may be with or without driving flats, tang, grooves or threads countersink angle - the included angle of the countersink portion (it is normally 60 deg.) taper shank drills - those having conical shanks' suitable for direct fitting into tapered holes in machine spindles, driving sleeves, or sockets Tapered shanks generally have a tang, which is used with a drift bar to eject the drill from its mating socket countersink relief angle - the angle between a plane at right anglesto the axis ofthe tool, and line a tangent to the surface of the countersink portion at the intersection of the countersink portion and the body and at the leading edge of the land For the bell type, the relief angle is measured at the intersection of the bell portion and the body 2.2.2 Based on Number of Flutes two-flute drills - the conventional type of drill used for originating holes countersink portion - that part of the tool which produces a conical bearing surface for the work centers The bell type produces an additional secondary conical section to provide clearance or protection for the bearing surface three-flute drills (coredrills) - drills commonly used for enlarging and finishing drilled, cast or punched holes They will not produce original holes four-flute drills (core drills) - used interchangeably 'with three-flute drills They are of similar construction except for the number of flutes drill diameter - the diameter of the drill portion measured across the outer corners of the cutting lips drill diameter relief - the relief provided on the land of the drill portion to reduce contact with the walls of the hole It is generally of an eccentric form 2.2.3 Based on Hand of Cut right-hand cut - when viewedfrom thecutting point, the counterclockwise rotation of a drill in order to cut drill length - the length of the drill portion from the outer corners of the cutting lips to its intersection with the countersink portion left-hand cut - when viewed from the cutting point, the clockwise rotation of a drill in order to cut drillportion - that part of the tool extending beyond Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh TWIST DRILLS Shank diameter Axis -shank Taper shank-in accordance with American National Standard 85.10, Machine Tapers FIG IDENTITY OF COREDRILL FEATURES 118 deg point Drill diameter Lanc Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh TABLE GENERAL DIMENSIONS OF TAPER SHANK TWIST DRILLS FRACTIONAL AND METRIC SIZES (CONT'D) Diameter of Drill D Fraction Decimal Inch Equivalent Millimeters 77.00 78.00 TABLE r Millimeter Equivalent 3.0000 3.031 3.0709 3.1 250 2.2500 76.200 77.000 78.000 79.375 82.550 3.5000 88.900 Fraction Millimeters 77.00 78.00 i c Regular Shank Overall Length Flute Length L Inch Millimeters 14 14% 14% 14% 15 'h 552 622 622 622 648 GENERAL DIMENSIONS OF TAPER SHANK TWIST DRILLS FRACTIONAL AND METRIC SIZES (CONT'D) Diameter of Drill A Morse Taper Number Decimal Inch Equivalent Millimeter Equivalent 3.0000 3.031 3.0709 3.1 250 2.2500 76.200 77.000 78.000 79.375 82.550 3.5000 88.900 I Morse Taper Number I Flute Length Overall Length F L A Inch Millimeters 5 5 14% 14% 14% 151' 362 362 362 387 16% 610 41 41 I Shank Smaller Than Regular Inch Millimeters 584 24 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w ASME B94.11M-1993 TWIST DRILLS deg TABLE SPLIT POINT DRILL GRINDING GENERAL NOTE: Source NAS 907, 14 Feb 1986, pp 15 and 16 48 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w TWIST DRILLS ASME 894.1 1M-1993 Cylindrical or Flatted Shanks Uniform dimensions for all drill sizes from A = 1/2 in to A = 1-1/4 in 0.500 - \ 2.25 6.00 e For A = 1/2 in t o in., these drills are standardized to be available in 1/32 in increments For A = in to 1-1/4 in., these drills are standardized to be available in1/16 in increments FIG DIMENSIONS OF FRACTIONAL SIZE TWIST DRILLS - HIGH SPEED STEEL (SILVER AND DEMING STYLE) 49 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w ASME B94.11M-1993 TWIST DRILLS TWIST DRILLS x L I 60% of drill diameter Drill diameter 3/8 in (9.525 mm) and larger Nominal shank size TABLE Drill diameter 11/32 in (8.733 mm) and smaller is same as nominal drill size See Table 10 for tolerances GENERAL DIMENSIONS OF THREE AND FOUR FLUTE STRAIGHT SHANK CORE DRILLS FRACTIONAL SIZES ONLY r Diameter of Drill Decimal Inch Equivalent Millimeter Equivalent 0.2500 0.281 0.3125 0.3438 0.3750 ? Three Flute Flute Length F ft Overall Length L Inch illillimeters Inch Vlillimeters 6.350 7.142 7.938 8.733 9.525 3% 3’Ia 4’1s 4’1s 95 98 102 105 105 6% 6V4 6Ya 6% 6% 56 59 62 165 171 0.4062 0.4375 0.4688 0.5000 0.531 10.31 11.112 11.908 12.700‘ 13.492 431s 4518 a3/4 4% 4% 111 117121 121 121 7 ’14 l/z 7% 178 184 190 197 203 0.5625 0.5938 0.6250 0.6562 0.6875 14.288 15.083 15.875 16.667 17.462 4% 41 ’s 4’la 5‘18 5Va 124 124 124 130 137 8V4 8% 8% 9% 210 222 222 229 235 0.71 88 0.7500 0.781 0.81 25 0.8438 18.258 19.050 19.842 20.638 21.433 51 ’s 149 9% 50 248 r F F Four Flute Flute Length F L Inch Willimeters Overall Length Inch Millimeters 4% 4% 121 121 7314 197 203 4% 4’la 4Jla 5’18 5318 124 124 124 130 137 8% 8% 8% 9% 210 222 222 229 235 57a 571s 6Va 6% 143 149 52 56 156 9% 9% 9% 10 10 241 48 251 254 254 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w ASME 894.1 1M-1993 TABLE ASME B94.11M-1993 GENERAL DIMENSIONS OF THREE AND FOUR FLUTE STRAIGHT SHANK CORE DRILLS FRACTIONAL SIZES ONLY (CONT'D) r Diameter of Drill D Inches 'la Decimal Inch Equivalent 0.8750 "/3z % 3'hz 11 ' 32 1'11 1'132 1'la 1'14 0.9375 0.9688 1.oooo 1.0312 1.0625 1.0938 1.1250 Millimeter Equivalent F Flute Flute Length F Inch 22.225 23.017 0.9062 23.81 24.608 25.400 26.1 92 26.988 27.783 28.575 31.750 f Millimeters 1.2500 I Three Four Flute Overall Length Flute Length Overall Length L Inch Millimeters 51 L F Inch Millimeters 10 10 103h 631~ 156 6% 156 156 162 162 11 254 254 273 279 279 6% 67a 61'8 7'16 7% 165 I68 175 181 200 11118 11'14 11'12 113/4 12'12 283 286 292 298 318 Inch 6% 61 's 631a Millimeters 11 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w TWIST DRILLS / TVVIST DRILLS Drill diameter3/8in (9.525mm) andlarger Taper shank dimensions and tolerances in accordance with American National Standard 85.10, Machine Tapers TABLE See Table 10 for tolerances GENERAL DIMENSIONS OF THREE AND FOUR FLUTE TAPER SHANK CORE DRILLS FRACTIONAL SIZES ONLY T Diameter of Drill Morse Taper Number Flute Length Decimal Inch Equiv mm Equiv 0.2500 0.2812 0.3175 0.3438 0.3750 6.350 7.142 7.938 8.733 9.525 1 1 271 3'1s 3% 3% 0.4062 0.4375 0.4688 0.5000 0.5312 10.217 11.112 11.908 12.700 13.492 1 2 0.5625 0.5938 0.6250 0.6562 0.6875 14.288 15.083 15.815 16.668 17.462 0.7188 0.7500 0.7812 0.81 25 0.8438 0.8750 0.9062 0.9375 0.9688 oooo A f Three Flute Inch Overall Length F mm - mm T Morse Taper Number A F Four Flute Flute Length Overall Length F L ~ mm Inch - mm - 73 76 79 83 89 156 159 162 165 171 3% 3% 4'1s 431a 4% 92 98 105 111 117 178 184 190 210 216 2 431s 4% 111 117 210 216 2 2 4% 47/8 4% 5% 5% 124 124 124 130 137 222 222 222 229 235 2 2 47/~ 4% 47/8 5% 5% 124 124 124 130 137 222 222 222 229 235 18.258 19.050 19.842 20.638 21.433 2 3 5% 5% 6% 6'/E 143 149 152 156 56 241 248 251 273 273 2 3 5% 5J/s 6' / E 6' / E 143 49 52 56 156 241 248 251 273 273 22.225 23.000 23.812 24.608 25.400 3 3 6'1s 6'1s 6% 631s 63/s 273 273 273 279 279 3 3 6% 6% 6% 631s 6310 156 56 156 162 162 - 156 156 156 162 162 52 273 273 273 279 279 - Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w ASME 894.11 M-1993 TABLE ASME B94.11M-1993 GENERAL DIMENSIONS OF THREE AND FOUR FLUTE TAPER SHANK CORE DRILLS FRACTIONAL SIZES ONLY (CONT'D) r meter of rill Morse Taper Number F Decimal Inch Equiv mm Equiv 1.0312 1.0625 1.0938 1.1250 1.1 562 26.192 26.988 27.783 28.575 29.367 3 4 6% 6% 6% 71'8 71'4 165 168 175 181 184 1.1875 1.21 88 1.2500 1.281 1.31 25 30.1 62 30.958 31.750 32.542 33.338 4 7% 71'2 7% 187 190 200 1.3438 1.3750 1.4062 1.4375 1.4683 34.1 33 34.925 35.71 36.512 37.300 1.5000 1.531 1.5675 1.5938 1.6250 38.1 00 38.892 39.688 40.483 41.275 1.6562 1.6875 1.8438 1.7500 1.7812 42.067 42.862 43.658 44.450 45.262 1.8125 1.oooo 1.8750 1.9062 1.9375 46.038 46.833 47.625 48.41 49.2 12 1.9688 2.0000 2.1 250 2.2500 2.3750 2.5000 A F Inch mm f Three Flute Flute Length Inch - Morse Taper Number mm A 111'8 1'14 12'k 1231~ 12% 283 286 318 324 327 3 4 13 13% 13% 330 333 343 7: Four Flute Flute Length - Overall Length mm - Inch 165 168 175 181 184 11110 114 11 22 2% 12710 4 4 187 190 200 216 219 13 13% 13% 14% 14% mm 283 286 318 324 327 330 333 343 359 362 4 4 222 225 229 232 235 14% 14'h 14% 14% 14% 365 368 37 375 378 5 5 238 238 244 251 254 15 16% 16% 16% 17 381 41 422 429 432 5' 5 5 257 257 257 257 257 lI8 17% 17% 17% 17'h 435 435 435 435 435 5 5 257 264 264 264 257 17'1s 435 50.008 50.800 53.975 57.1 50 60.325 5 5 264 264 260 257 257 17% 17% 173h 1J3h 17% 441 441 441 441 441 63.500 - - 286 - 183/4 476 53 17% 17% 173L 17% 435 441 441 441 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh TWIST DRILLS 60 deg 120 deg L - Plain Type DIMENSIONS OF COMBINED DRILLS AND COUNTERSINKS TABLE9AGENERAL Plain Type Body Diameter Size Designation A Inches 00 [ 'k 1'4 '12 3/4 - 16 - 17 18 I Body Diameter 3116 1'4 51'~ 71~6 'I2 518 % A Millimeters 3.18 4.76 6.35 7.94 11.11 12.70 15.88 19.05 0.64 Inches Millimeters 1'18 1'la 11'4 29 29 32 0.76 0.97 1.19 1.98 2.78 ~ 3.18 4.76 5.56 6.35 7.94 48 51 3.18 4.76 5.56 6.35 7.94 54 70 76 83 89 Bell Type Drill Diameter Millimeters 0.10 5132 1.19 1.59 2.38 2.78 3.97 2.5 3.8 5.1 6.4 8.1 1'1 'h2 1'4 4.76 5.56 6.35 3h2 - - 0.1 0.20 0.25 0.35 0.40 0.50 0.60 54 L C Inches ~ Overall Lenath ~~ E D Inches Drill Length Bell Diameter Millimeters 1' 16 Millimeters 030 038 0.79 1.19 1.98 2.78 %4 11.11 12.70 15.88 19.05 5!s Inches Millimeters 7.94 1'1 '11 'la 025 1'32 2.38 2.38 3.184.76 6.35 31' Size Designation Inches 11 12 13 14 15 Millimeters '132 Inches L C D '132 Overall Length Drill Length Drill Diameter 10.2 12.7 15.2 Inches 3/64 'I16 3/32 1'64 %2 311 '132 1'4 Millimeters 1.19 1.59 2.38 2.78 3.97 4.76 5.56 6.35 Inches I Millimeters Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w TWIST DRILLS ASME 894.1 1M-1993 ASME B94.11 M-1993 TABLE9BTOLERANCES OF COMBINED DRILLS AND COUNTERSINKS inches Millimeters Element Size Designations Plus ( + ) Minus ( - ) Plus ( + ) Minus ( - ) Body diameter (A) All sizes 0.0000 0.0020 0.000 0.051 0.005 0.005 0.1 0.13 0.20 0.20 00 through 1-1 Drill length (C) Drill diameter (D) ~ Overall length ( L ) I 0.008 11 and 12 through 13 through 18 All sizes All sizes '164 0.0030 'hz I 0.008 '164 0.0000 lI16 I 0.4 0.076 0.8 I I 0.4 0.000 1.6 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh TWIST DRILLS ELEMENT TOLERANCES FOR HIGH SPEEDSTEEL GENERAL PURPOSE TWIST DRILLS TABLE 10 Drill Diameter at Point Tolerance Diameter of Drill I Inches - I Inches Millimeters Plus ( + ) Minus ( - ) From #97 Over #81 Over 1/8 Over '14 through #81 through through I14 through I12 From 0.15 Over 0.33 Over 3.18 Over6.35 0.33 3.18 6.35 12.70 0.0002 0.0000 0.0000 0.0000 0.0002 0.0005 0.0007 0.001 Over '12 Over Over through.1 through through 3% Over 12.70 through 25.40 Over 25.40 through 50.80 Over 50.80 throuqh 88.90 0.0000 0.0000 0.0000 0.0012 0.0015 0.0020 through through through through I Millimeters Plus ( + ) Minus ( - ) 0.005 0.000 0.000 0.000 0.005 0.013 0.018 0.025 0.000 0.000 0.000 0.030 0.038 0.051 Shank Diameter (Straight Shank Drills) Tolerance Diameter of Drill Inches Inches Millimeters From #97 through #81 From 0.15 through 0.33 Over #81 through Over through Over I14 through Over 0.33 Over 3.18 Over '12 I18 I14 I12 through Plus ( + ) through 3.18 through 6.35 through 12.70 Millimeters Minus ( - ) Plus ( + ) 0.0002 Minus ( - ) 0.0000 0.0025 0.0005 0.0030 0.0005Over6.35 0.0045 0.005 Minus ( - ) 0.0002 Minus ( - ) through 50.80 0.0005 Over 12.70 0.0030 I Minus ( - ) 0.000 0.01 0.013 0.005 Minus ( - ) 0.064 0.076 0.1 14 0.01 0.076 Back Taper Diameter of Drill Inches From#97 #81 Over 1/8 Over '14 through #81 through '1s through I14 through llz Over '12 Over through through 3% I Millimeters I I Tolerance Per From 0.15 through 0.33 Over 0.33 through 3.18Over through 6.35 Over6.35 through 12.70 = Unit of Length Flute Inches None 0.0000to 0.0008 - Over 12.70 through 25.40 Over 25.40 through 88.90 56 I Millimeters None 0.000to 0.020 0.0002 to 0.0008 Over 3.18 0.0002 to 0.0009 0.005 to 0.020 0.005 to 0.022 0.0003 to 0.0011 0.0004 to 0.001 0.007 to 0.028 0.010 to 0.038 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w TWIST DRILLS ASME B94.11M-1993 ASME 894.11M-1993 TABLE 10 ELEMENT TOLERANCES FOR HIGH SPEEDSTEEL GENERAL PURPOSE TWIST DRILLS (CONT'D) Flute Length Tolerance Diameter of Drill Millimeters Inches Millimeters Inches Plus ( + ) Minus ( - ) Plus ( + ) From#97 through #81 Over #81 through '18 Over '18 through '12 Over l/2 through From 0.15 Over 0.33 Over 3.18 Over 12.70 0.33 3.18 12.70 25.40 3.2 3.2 6.4 Over Over Over 25.40 through 50.80 Over 50.80 through 88.90 6.4 9.5 through throuah 3% through through through through I 1I Minus(-) 1.6 3.2 I 3.2 Overall Length Tolerance Diameter of Drill Plus ( + Millimeters Inches From#97 through #81 Over #81 through l/8 Over '/a through '12 Over '12 through From 0.15 Over 0.33 Over 3.18 Over 12.70 Over Over Over 25.40 through 50.80 Over 50.80 through 88.90 through through3% through through through through 0.33 3.18 12.70 25.40 Millimeters Inches Minus ( - '132 '/a 'la 114 1'4 1'4 31~ 31~ Plus ( + Minus ( - ) 0.8 3.2 3.2 6.4 0.8 1.6 3.2 3.2 6.4 9.5 6.4 9.5 Included Angle of Point Diameter of Prill Inches Millimeters Frorn1/16 through '12 Over '12 through 1'12 Over 1%through3% From 1.59 through 12.70 Over 12.70 through 38.10 Over 38.10 through 88.90 Tolerance Included Angle 118O 118O 118O GENERAL NOTE: 95% of drills in any one lot to fall within above tolerance 57 f 50 *3O f 20 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh TWIST DRILLS TABLE 10 ELEMENTTOLERANCES FOR HIGH SPEEDSTEEL GENERAL PURPOSE TWIST DRILLS (CONT'D) Lip Height I Tolerance Total Indicator Variation (T.1.V.) Diameter of Drill through '/a through'% through l/z through through 3% Millimeters Inches Millimeters Inches From '/16 Over l/a Over l/4 Over 1/~ Over 0.051 0.076 0.1 02 0.127 0.1 52 0.0020 0.0030 0.0040 0.0050 0.0060 From 1.59 through 3.18 Over 3.18 through 6.35 Over 6.35 through 12.70 Over 12.70 through 25.40 Over 25.40 through 88.90 GENERAL NOTES: (a) 95% of drills in any one lot to fall within above tolerance (b)Method of-measurement: Rotate the drill in a V-block against a back end stop Measure the cutting lip height variation on a comparator, or with an indicator set at a location approximately 75% of the distance from the center to the periphery of the.dril1 Centrality of Web Tolerance Total Indicator Variation (T.I.V.) Diameter of Drill From1/16 -through l/8 -Over '18 through l/4~ Over l/4 through (12 Over l/z through Over through 3% GENERAL NOTES: Millimeters Inches Millimeters Inches 0.076 0.1 02 0.1 27 0.178 0.254 0.0030 0.0040 0.0050 0.0070 0.0100 From 1.59 through 3.18 Over 3.18 through 6.35 Over 6.35 through 12.70 Over 12.70 through 25.40 Over 25.40 through 88.90 - ( a ) 95% of drills in any one lot t o fall within above tolerance (b)Method of measurement: Rotate-the drill in a close fitting bushing Record the difference in indicator readings of the web at the point as the drill is indexed 180 deg - lute Spacing Tolerance Diameter of Drill Inches From1/16 Over % Over 1/4 Over l/z - Over ~ Total Indicator Variation (T.I.V.) through l/8 through V4 through V Z through through 3% Millimeters From 1.59 through Over 3.18 through Oyer 6.35 through Over 12.70 through Over 25.40 through Inches 3.18 6.35 12.70 25.40 88.90 0.0100 0.0140 0.0260 Millimeters 0.076 0.152 0.254 0.356 Actual Deviation Inches 0.0015 0.0030 0.0060 0.0070 0.0130 Millimeters 0.038 0.076 0.127 0.178 0.6600.:330 0.0030 0.0050 GENERAL NOTES: (a)%% of drills in any one lot to.fall within above tolerance (b)Method of measurement: Place the drill in a V-block against a back end stop, and rotate it against a radial finger stop Take an indicator reading at the leading edge ofthe margin on the opposite flute Repeat for the other flute and note the difference between the two readings The deviation in flute spacing is equal to one-half the difference between the two readings 58 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w TWIST DRILLS ASME 894.1 1M-1993 ASME B94.11M-1993 TABLE 10 ELEMENT TOLERANCES FOR HIGH SPEED STEEL GENERAL PURPOSE TWIST DRILLS (CONT'D) Runout (Straightness) Jobbers Length: For drills smaller than ,03125 in., runout tolerances to be to manufacturer's discretion For drills 03125 in and larger, runout tolerances are to be calculated per the following formula: )] + overall length drill diameter 00368 Examples Maximum TIR Diameter 005 ,005 TaperLengths: For drills smaller than 03125 in., runout tolerances to be to manufacturer's discretion For drills ,031 25 in and larger, runout tolerances are to be calculated per the following formula: )] + overall length drill diameter ,0027 The maximum allowable value, however, is ,020 TIR Examples Maximum TIR Diameter ,021 (use 020) 018 012 '/I 'la '14 009 31~ ,009 'I2 008 3/4 ,007 ,006 1 112 GENERAL NOTES: (a)The portion of Table 10 on pages 59 and 60 is excerpted from Table 805 in Metal CuttingTool Handbook, Seventh Edition, published for theUS Cutting US Cutting Tool Institute by Industrial Press Reproduced by permission of the Tool Institute (b)All dimensions are in inches 59 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh TWIST DRILLS TWIST DRILLS TABLE 10 ELEMENT TOLERANCES FOR HIGH SPEED STEEL GENERAL PURPOSE TWIST DRILLS (CONT'D) Runout (Straightness) Screw Machine Lengths: For drills smaller than 0400 in., runout tolerances t o be to manufacturer's discretion For drills 0400 in and larger, runout tolerances are to be calculated per the following formula: MaximumTIR= [ 0001316 overall length (drill diameter)] -+ '00368 The maximum allowable value, however, is 007 in TIR Examples Diameter Maximum TIR ,007 ,006 005 005 005 005 004 004 ~~ in Aircraft Drills Diameter Range Maximum TIR 0400-.0624 ,0625-,1249 3250-,2499 ,2500-.3749 3750-.4999 5000 020 015 012 010 007 005 , 12 in Aircraft Drills Diameter Range Maximum TIR ,0400-.0624 ,0625-,1934 1935-.5000 040 ,035 ,025 Taper Shank Diameter Range Maximum TIR ,1250-,3749 3750-1.4999 1.5000 and lamer ,015 ,010 007 GENERAL NOTES: (a)All dimensions are in inches (b) 95% of drills in any one lot to fall within above tolerance (c) Method of measurement: (1) Straight shank drills are to be checked with in of shank in a V-block with measurements taken on the margins at the point.shank If length isshorter than in., use the full length of shank (2)Taper shank drills are to be checked with the shank in a tapered V-block or a precision socket (d)Calculated values are to be rounded to the nearer thousandth of an inch 60 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh ASME B94.11M-1993 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled when