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 6Shanghai 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