Principles ■ Show every necessary dimension. Never repeat a dimension. Locate dimensions that are linked to one another with respect to the same datum. If possible,avoid crossing two dimension lines. Arrange a series of dimensions in a continuous line. Place longer dimensions outside shorter ones so that extension lines will not cross dimension lines. Place dimensioning information outside the orthographic views if possible. Leaders note dimensions and information. Fillet are dimensioned with leaders or by an appropriate note. Shanghai Jiao Tong University 6
Shanghai Jiao Tong University 6 Principles n Show every necessary dimension. n Never repeat a dimension. n Locate dimensions that are linked to one another with respect to the same datum. n If possible, avoid crossing two dimension lines. n Arrange a series of dimensions in a continuous line. n Place longer dimensions outside shorter ones so that extension lines will not cross dimension lines. n Place dimensioning information outside the orthographic views if possible. n Leaders note dimensions and information. n Fillet are dimensioned with leaders or by an appropriate note
Principles 618 71- 50 40 色30 00So 55 10 160 43129 481.29 Shanghai Jiao Tong University 7
Shanghai Jiao Tong University 7 Principles
Standards Extension Lines Dimension Lines Dimension 582 Shanghai Jiao Tong University 8
Shanghai Jiao Tong University 8 Standards n Extension Lines n Dimension Lines n Dimension
Threads Threads are specified by giving the nominal diameter and threads per inch. ANSI:%-13UNC;%-13UNF ■Metric:M8x1.25 Shanghai Jiao Tong University 9
Shanghai Jiao Tong University 9 Threads n Threads are specified by giving the nominal diameter and threads per inch. n ANSI: ½-13UNC; ½-13UNF n Metric: M8x1.25
Schematic Symbols EXTERNAL SECTION EXTERNAL THREADS ELEVATION SECTION INTERNAL THREADS Shanghai Jiao Tong University 10
Shanghai Jiao Tong University 10 Schematic Symbols