engr 111a 9.1 dimensions

engr 111a 9.1 dimensions - ENGR111AFall2009 October26,2009

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Basic  Dimensioning with  AutoCAD ENGR 111 A                Fall 2009   Class 9.1 October 26, 2009
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Were You Mom’s Favorite??
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Learning Objectives Be able to understand the basic rules of dimensioning Apply dimensions to objects in accordance with engineering standards Define the following items: Dimension line, Extension line, Reference dimension, and Leader
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Basic Dimensioning Dimensions allow a part to be manufactured Dimensions are ALWAYS in real world units Dimensions should be applied in a concise, coherent manner
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Dimensioning Terminology
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Dimensioning Rules Avoid placing any dimensions on the part (inside of the view) unless there is no other option (fig 4.5) Avoid Dimensioning to hidden lines (fig. 4.6) Dimension the most descriptive view. Avoid using "T" joints. (fig 4.7) Always dimension holes in their circular view by stating the diameter. (fig 4.8) Dimension rounded corners and arc features as radii where they appear in their rounded views. (fig 4.9) If the same value is repeated many times, then use a general note for the features (fig 4.9) Dimension cylindrical objects as diameters in their rectangular view. (fig 4.10) First row 3 times the letter height away from object. Second row an additional 2 times the letter height. (fig 4.11) Keep dimensions between views whenever possible (fig 4.12) Extension lines may cross each other and over other lines on the part, but dimension lines should never be crossed. The over all dimension should always be given. (fig 4.13) Do not duplicate dimensions and avoid using unnecessary dimensions. (fig 4.13)
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Dimensioning Rules When all dimensions are expressed in inches, do not use inch mark (“) or abbreviation for inches (in). For drawings dimensioned in inches, values less that one inch should not be preceded with a zero. For metric dimensions less than 1
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This note was uploaded on 04/04/2011 for the course ENGR 111 taught by Professor Walker during the Fall '07 term at Texas A&M.

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engr 111a 9.1 dimensions - ENGR111AFall2009 October26,2009

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