DimRules - Eleven Cardinal Dimensioning Rules based on ANSI...

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Eleven Cardinal Dimensioning Rules based on ANSI Y14 Standards Based on ANSI/ASME Y14.5M-1994 and others 1. Dimensions should not be applied to hidden lines. Choose another view where the feature is visible or make the feature visible via sectioning. 2. Dimensions should not be placed directly on a part. Use witness (extension) lines. Dimensions using leaders may directly touch a visible (object or part) line. 3. Dimension should not be within the perimeter of a part. Place all dimensions outside of the part perimeter. Only witness lines and/or leaders should touch the part or be within the part perimeter. 4. Dimensioning of a particular feature should only occur once, even if calculated. 5. Where possible, apply dimension in a view containing the true shape projection (TSP) of the feature. For instance, the TSP of a cylindrical feature is where it is seen as a circle. Thus when dimensioning the diameter (or radius), do so in the view where the feature appears as a circle, not as a rectangle.
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This note was uploaded on 02/21/2012 for the course MET 102 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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