engr 111c_12_2_08c_otey

engr 111c_12_2_08c_otey - BASIC DIMENSIONING ENGR 111C...

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BASIC  DIMENSIONING ENGR 111C   Class 12.2 November 10, 2008 How to annotate simple drawings for use in  constructing an object
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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 (Fig. No’s in  Vinson’s Graphics Book) 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 
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This note was uploaded on 09/01/2009 for the course ENGR 111 taught by Professor Walker during the Spring '07 term at Texas A&M.

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engr 111c_12_2_08c_otey - BASIC DIMENSIONING ENGR 111C...

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