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 |  موضوع: كتاب Dimensions and Tolerances الخميس 05 يوليو 2018, 6:06 pm | |
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Dimensions and Tolerances
American Society of Mechanical Engineers
Engineering Drawing and Related Documentation Practices
ويتناول الموضوعات الأتية :
CONTENTS
Foreword .. vi
Committee Roster viii
Correspondence With the Y14 Committee .. ix
Section 1 Scope, Definitions, and General Dimensioning .. 1
1.1 Scope 1
1.2 References ... 1
1.3 Definitions .. 2
1.4 Fundamental Rules 7
1.5 Units of Measure 8
1.6 Types of Dimensioning . 9
1.7 Application of Dimensions .. 10
1.8 Dimensioning Features . 13
1.9 Location of Features .. 20
Section 2 General Tolerancing and Related Principles .. 24
2.1 General 24
2.2 Direct Tolerancing Methods . 24
2.3 Tolerance Expression . 25
2.4 Interpretation of Limits . 26
2.5 Single Limits ... 26
2.6 Tolerance Accumulation ... 26
2.7 Limits of Size 27
2.8 Applicability of Modifiers on Geometric Tolerance Values and Datum Feature References . 29
2.9 Screw Threads 31
2.10 Gears and Splines .. 31
2.11 Boundary Conditions 31
2.12 Angular Surfaces ... 31
2.13 Conical Tapers 35
2.14 Flat Tapers ... 35
2.15 Radius .. 36
2.16 Tangent Plane . 36
2.17 Statistical Tolerancing ... 36
Section 3 Symbology .. 38
3.1 General 38
3.2 Use of Notes to Supplement Symbols 38
3.3 Symbol Construction . 38
3.4 Feature Control Frame Symbols .. 44
3.5 Feature Control Frame Placement ... 46
3.6 Definition of the Tolerance Zone . 46
3.7 Tabulated Tolerances . 46
Section 4 Datum Reference Frames 48
4.1 General 48
4.2 Degrees of Freedom ... 48
4.3 Degrees of Freedom Constrained by Primary Datum Features
Regardless of Material Boundary 48
4.4 Constraining Degrees of Freedom of a Part ... 48
4.5 Datum Feature Simulator . 53
4.6 Theoretical and Physical Application of Datum Feature Simulators . 53
4.7 Datum Reference Frame ... 53
4.8 Datum Features .. 57
4.9 Datum Feature Controls ... 58
4.10 Specifying Datum Features in an Order of Precedence ... 58
4.11 Establishing Datums . 59
4.12 Multiple Datum Features . 65
4.13 Mathematically Defined Surface . 69
4.14 Multiple Datum Reference Frames . 69
4.15 Functional Datum Features .. 69
4.16 Rotational Constraint About a Datum Axis or Point 70
4.17 Application of MMB, LMB, and RMB to Irregular Features of Size .. 74
4.18 Datum Feature Selection Practical Application . 75
4.19 Simultaneous Requirements 76
4.20 Restrained Condition 79
4.21 Datum Reference Frame Identification .. 79
4.22 Customized Datum Reference Frame Construction . 81
4.23 Application of a Customized Datum Reference Frame ... 81
4.24 Datum Targets 83
Section 5 Tolerances of Form .. 91
5.1 General 91
5.2 Form Control .. 91
5.3 Specifying Form Tolerances . 91
5.4 Form Tolerances . 91
5.5 Application of Free-State Symbol 95
Section 6 Tolerances of Orientation ... 99
6.1 General 99
6.2 Orientation Control ... 99
6.3 Orientation Symbols .. 99
6.4 Specifying Orientation Tolerances .. 99
6.5 Tangent Plane . 103
6.6 Alternative Practice ... 103
Section 7 Tolerances of Location 108
7.1 General 108
7.2 Positional Tolerancing ... 108
7.3 Positional Tolerancing Fundamentals: I . 108
7.4 Positional Tolerancing Fundamentals: II 119
7.5 Pattern Location . 127
7.6 Coaxial Feature Controls .. 148
7.7 Tolerancing for Symmetrical Relationships ... 156
Section 8 Tolerances of Profile ... 158
8.1 General 158
8.2 Profile .. 158
8.3 Tolerance Zone Boundaries .. 158
8.4 Profile Applications ... 165
8.5 Material Condition and Boundary Condition Modifiers as
Related to Profile Controls ... 167
8.6 Composite Profile .. 167
8.7 Multiple Single-Segment Profile Tolerancing 175
8.8 Combined Controls . 175
Section 9 Tolerances of Runout .. 180
9.1 General 180
9.2 Runout . 180
9.3 Runout Tolerance ... 180
9.4 Types of Runout Tolerances . 180
9.5 Application . 182
9.6 Specification ... 182
A Principal Changes and Improvements . 185
B Formulas for Positional Tolerancing . 191
C Form, Proportion, and Comparison of Symbols .. 194
D Former Practices .. 199
E Decision Diagrams for Geometric Control .. 200
Index ..
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