ASME_B5.51M-1979.pdf

ASME B5.51M790759b700047067T90-15AMERICAN NATIONAL STANDARDPreferred SI Unitsfor Machine ToolsANSI B5.51M-1979SECRETARIATSOCIETY OF AUTOMOTIVE ENGINEERSSOCIETY OF MANUFACTURING ENGINEERSNATIONAL MACHINE TOOL BUILDERS ASSOCIATIONAMERICAN SOCIETY OF MECHANICAL ENGINEERSPUBLISHED BYTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSUnited Engineering Center 345 East 47th Street New York,N.Y.10017ASME B5.51M79075967000470681No part of this document may be reproduced in any form,in an electronicretrieval system or otherwise,without the prior written permission of thepublisher.Date of Issuance:April 30,1979Copyright 1979 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.a是2ASME B5.51M79075967000470693FOREWORDThe manufacturers and users of machine tools,following many years of use of the customary or inchunits of measurement,had developed a rationalized list of preferred units and symbols for selected quantities for machine tools.This was essential for conversational and documentary clarity and uniformity.Example:The inch has been used when specifying dimensions and tolerances of engineering drawings;feet and/or yards have been avoided.Spindle speeds have normally been stated in revolutions per minute;revolutions per second or hour have been avoided.As the SI units and symbols began to be used in place of the customary units and symbols,it.becameapparent that a practical rationalization of the many choices of these units was needed for machine tooluse.Several years ago the main committee of ANSI B5 discussed the possible need of this preferred list of SIunits and symbols for use on machine tools.As a result of this expressed need a preliminary list was preparedunder the direction of ANSI B5 by Mr.Walter Nahrup.The list was circulated widely to many manufacturers and users of machine tools and all commentsreceived were a positive expression of the need for a preferred list of SI units and symbols.Following the review of comments resulting from circulation here in the United States and a review withinternational authorities,the list was updated and received further circulation,review and testing.The main committee of ANSI B5,following further discussion and review,unanimously agreed torecommend the United States standardization of this list of Preferred SI Units and Symbols for MachineTools.The units already in common use in the United States and throughout the world that are acceptable inthe SI system were maintained wherever practical.This was essential to avoid any unnecessary confusion aswe move to the use of SI units.Example:Revolutions per minute are preferred;revolutions per second or revolutions per hour are notrecommended.Where unique SI units were selected,the unit that could be stated in the most easily used number orrange of numbers was usually selected.Example:Cutting speed in the customary units has been stated in feet per minute.The range in normaluse in machine tools is approximately 50 feet per minute to 2000 feet per minute.Meter per minute hasbeen selected as the preferred SI unit.The minute is maintained as the span of time.The meter was selectedas the unit of space thus the normal range will be approximately 15 meters per minute to 610 meters perminute.This Standard,following approval by the Standards Committee and the Sponsor was approved as anAmerican National Standard on February 9,1979 and designated B5.51M-1979.ASME B5.51M7907596700047070TAMERICAN NATIONAL STANDARDS COMMITTEE B5MACHINE TOOLS,COMPONENTS,ELEMENTS,PERFORMANCE AND EQUIPMENTOFFICERSPaul Ackermann,ChairmanR.C.Miller,Vice-Chairman(Group AJ Gilbart Rose,Vice-Chairman(Group B)Harold Cooper,Vice-Chairman(Group C)E.J.Loeffler,SecretaryCOMMITTEE PERSONNELAMERICAN SOCIETY OF MECHANICAL ENGINEERS,THEF.Steele Bfackalt,/The Taft-Peirce Manufacturing Company,Woonsocket,Rhode IslandGilbert Ross,Cogsdill Tool Products,Inc.,Camden,South CarolinaDEFENSE INDUSTRIAL PLANT EQUIPMENT CENTERJ.W.Lynch,Defense Industrial Plant Equipment Center,Memphis,TennesseeG.T.Smith,A/ternate,Defense Industrial Plant Equipment Center,Memphis,TennesseeMOTOR VEHICLE MANUFACTURERS ASSOCIATIONA/len R.Neinast,International Harvester Company,Hinsdale,IlinoisB.Ross Ashby,A/ternate,Motor Vehicle Manufacturers Association of The United States,Inc.,Detroit,MichiganNATIONAL MACHINE TOOL BUILDERSASSOCIATIONCharles Brien,Bullard Company,Bridgeport,ConnecticutE.J.Loeffler,A/ternate,National Machine Tool BuildersAssociation,McLean,VirginiaRobort C.Miller,Giddings Lewis,Inc.,Fond Du Lac,WisconsinWa/ter Nahrup,Cincinnati Milacron,Inc.,Cincinnati,OhioSOCIETY OF AUTOMOTIVE ENGINEERSRobert W.Kynast,The Cross Company,Fraser,MichiganSOCIETY OF MANUFACTURING ENGINEERSJohn H.Hubbard,Warner Swasey,Solon,OhioW.N.Moore,The Ford Motor Company,Dearborn,MichiganRichard Pugh,Jones Lamson,Springfield,VermontSOCKET SCREW PRODUCTS BUREAUTo be appointedTELEPHONE GROUP,THER.A.Agnew,Western Electric Company,Inc.,Chicago,IllinoisS.P.Rogacki,A/ternate,Western Electric Company,Ine.,Kearney,New JerseyU.S.DEPARTMENT OF THE ARMYD.L.York,Lialson,Material Readiness Command,Rock Island,MlinoisU.S.DEPARTMENT OP THE NAYYJ.R.Ruff,Naval Ship Systems Command,Washington,D.C.INDIVIDUAL MEMBERSPaul Ackermann,Cincinnati Milacron,Inc.,Cincinnati,OhioHarold Cooper,Chrysler Corporation,Detroit,MichiganE.W.Couture,A/ternate,Brown Sharpe Manufacturing Company,North Kingston,Rhode IslandR.J.Gargrave,Ready Stamping Systems,Dayton,OhioHarry McLinden,Caterpillar Tractor Company,Peoria,IllinoisSmetana,General Electric Company,Schenectady,New YorkASME B.5.51M79075967000470711CONTENTSPage1.Scope,12.Pup0s814.TablesTable 1 Space and Time.2Table 2 Periodic and Related Phenomena.3Table3 Mechanics34Table 5Electricity.4Appendix 1-Units and Range of Normally Used Numbers.5i