1958_2016.pdf

AMERICAN STANDARD Microscope Objecti.ve Thre-ad.ASA B1.11-1958 UDC 621.882.082:535.822:681.42-.-.REAFFIRMED 1994 FOR CURRENT COMMllTEE PERSONNEL PLEASE SEE ASME MANUAL AS-1 1 REAFF:IRMED 1989 FOR CURRENT COMMllTEE PERSONNEL PLEASE SEE ASME MANUAL AS-fl-.,.Society o f Automotive Engineers The American Society o f Mechanical Engineers T H E A M E R I C A N S O C I E T Y O F M E C H A N I C A L E N G I N E E R S 29 West 39th Street,New York 18,N.Y.REAFFIRMED 2016Intentionally left blank ERRATA ANSI B1.ll-1958 (R1972)MICROSCOPE OBJECTIVE THREAD(JULY 1972)Page 5,Section 7 should read,American National Standard ANSI B1.7-1965(R1972)Page 6,Section 14 should read,Angle Deviation.Foreword The standardization of the microscope objective thread is one of the projects toward unification of screw thread standards among inch-using countries.In Great Britain,the Royal Microscopical Society had established standards for microscope objectives in 1858,based on the Whitworth screw thread system,which were subsequently used throughout the world.The history of this standard is in the Transactions of the Society:1858,p.39;1859,p.92;1896,pp.389,487;1911,p.175;1915,p.230;1924,p.266;and 1936,p.377.In practice,American manufacturers of this thread have always employed modifications of the Whitworth form because of their preference for flat crests,such modified threads being completely interchangeable with the RMS threads.At the Conference on Unification of Engineering Stand-ards held in Ottawa,1945,the American Delegation presented ASA Paper B1/57 and A.O.Drawing ED-95 giving limits of size for a truncated Whitworth thread.Since a thread form with rounded crest is preferred in Great Britain for optical instruments,it was recommended that the title of this document be amended to read,“Proposed Permitted Truncation and Tolerances for RMS Thread.”On the basis of this proposal a draft of a proposed American Standard,dated April,1948,was cir-culated to the B1 Sectional Committee membership for comment.In conformity with comments received,a revised draft,dated October,1954,was approved by Subcommittee No.4 on Instrument Screw Threads and subsequently submitted to the Sectional Commlttee for approval.Final approval as an American Standard was given on January 7,1958,by ASA.Any part o f this standard may be quoted.Credit lines should read:“Ex2ractedjro&Amhican Standard Microscope Objective Thread(ASA B2.22-2958)with the permission o f the publisher,The.American Society o f Mechanical Engineers,29 w.39th st.,New York 28,N.Y.,3.I .Copyright,1958,by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS Printed in U.S.A.2 Officers of Sectional Committee on Standardization and Unification of Screw Threads,Bl Frank P.Tisch,Chairman William H.Gourlie,Vice-chairman W.C.Cadwell,Secretary Personnel of Subcommittee No.4 on Instrument Screw Threads E.W.Dresher,Chairman,Mgr.,Quality Control,Hathaway Instrument Division,Hamilton Watch Company,J.C.Burgbacher,Engineer,Bulova Watch Co.,Flushing,N.Y.F.L.Calkins,Commander,WCXPS,Wright Air Development Center,Wright-Patterson Air Force Base,Ohio J.W.Evans,Commander,WCLS J3 Special Products Branch,Aircraft Labs.,Wright Air Development Center K.E.Faiver,Senior Design Engr.,Olds Motor Div.,General Motors Corp.,Lansing,Mich.R.F.Frye,Mgr.,Materials&Stds.Dept.,Westinghouse Electric Corp.,East Pittsburgh,Pa.I.H.Fullmer,Chief,Engineering Metrology Sec.,National Bureau of Standards,Washington,D.C.W.H.Gourlie,Standards Engr.,The Sheffield Corp.,Dayton,Ohio V.C.Meigs,Engineering Dept.,Autonetics,a division of North American Aviation,Inc.,Bellflower,Calif.D.R.Miller,3521 36th St.,N.W.,Washington,D.C.J.H.Miller,Vice-Pres.,Weston Electrical Instrument Corp.,Newark,N.J.D.V.Peroni,Commander,WCXPS,Wright Air Development Center,Wright-Patterson Air Force Base,Ohio H.W.Robb,Manager,Company Standards,Engineering Services Div.,General Electric Co.,Schenectady,N.Y.E.H.Schaeffer,Chief Engr.,Elgin National Watch Co.,Elgin,Ill.M.A.Schultheis,Staff Engr.,Systems Development Lab.,Hughes Aircraft Co.,Culver City,Calif.C.E.Smart,Works-Mgr.,W.&L.E.Gurley,Troy,N.Y.C.S.Tallman,Development Physicist,American Optical Co.,Instrument Div.,Buffalo,N.Y.S.B.Terry,Orient,L.I.,N.Y.K.T.Vande,Chief Draftsman,Bausch&Lomb Optical Co.,Rochester,N.Y.D.F.Viles,President,Waltham Screw Co.,Waltham,Mass.P.F.Weber,Asst.to Pres.,Kollsman Instrument Corp.,Elmhurst,Long Island,N.Y.Denver,Colorado Wright-Patterson Air Force Base,Ohio 3 Intentionally left blank American Standard MICROSCOPE OBJECTIVE THREAD GENERAL AND HISTORICAL 1 This standard covers the screw thread used for mounting the objective assembly to the body or lens turret of microscopes.It is based on,and intended to be interchangeable with,the screw thread introduced and adopted many years ago by the Royal Microscopical Society of Great Britain,generally known as the RMS thread and now almost universally accepted as the basic standard for microscope objective mountings.Formal recognition,however,has been extreme