tailieunhanh - Dimensioning and Tolerancing Part 1

Tham khảo tài liệu 'dimensioning and tolerancing part 1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | AN ASME NATIONAL STANDARD --- ENGINEERING DRAWING AND RELATED DOCUMENTATION PRACTICES Dimensioning and Tolerancing ASME REVISION OF ANSI R1988 1 IcWsl ah The American Society of Mechanical Engineers 345 East 47 th Street New York . CONTENTS Foreword. iii Standards Committee Roster. vii 1 Scope Definitions and General Dimensioning. I General. 1 References. 1 Definitions. 2 Fundamental Rules. 4 Units of Measurement. 4 Types of Dimensioning. 5 Application of Dimensions. 6 Dimensioning Features. 10 Location of Features. 18 2 General Tolerancing and Related Principles. 23 General. 23 Direct Tolerancing Methods. 24 Tolerance Expression. 24 Interpretation of Limits. 25 Single Limits. 25 Tolerance Accumulation. 25 Limits of Size. 26 Applicability of RFS MMC and LMC. 28 Screw Threads. 29 Gears and Splines. 29 Virtual Resultant Condition. 29 Angular Surfaces. 29 Conical Tapers. 29 Flat Tapers. 37 Radius. 38 Statistical Tolerancing. 38 3 Symbology. 41 General . 41 Use of Notes to Supplement Symbols. 41 Symbol Construction. 41 Geometric Tolerance Symbols. 47 Feature Control Frame Placement. 48 Definition of the Tolerance Zone. 48 Tabulated Tolerances. 50 ix 4 Datum Referencing. 51 General. 51 Immobilization of Part. 51 Datum Features. 52 Specifying Datum Features in an Order of Precedence. 52 Establishing Datums. 55 Datum Targets. 70 5 Tolerances of Location. 81 General. 81 Positional Tolerancing. 81 Fundamental Explanation of Positional Tolerancing. 81 Feature Pattern Location. 93 Projected Tolerance Zone. 115 Nonparallel Holes. 135 Counterbored Holes. 135 Closer Control at One End of a Feature. 135 Bidừectional Positional Tolerancing of Features. 135 Noncircular Features. 139 Coaxiality Controls. 142 Concentricity. 144 Positional .