EN2_F07_P06_Dim_STUDENT

EN2_F07_P06_Dim_STUDENT - EN 2 Engineering Graphics and CAD...

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EN 2 - Intro. to Engineering Graphics & CAD 1 EN 2 Engineering Graphics  and CAD Lecture 6 Dimensioning, Drawing Annotation and The Drawing-Model Dichotomy
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EN 2 - Intro. to Engineering Graphics & CAD 2 WHICH ENGINEERING MAJOR IS  FOR ME? Now is your chance to  EXPLORE CIVIL AND  ENVIRONMENTAL ENGINEERING! Listen to students and professors tell you more  about the field and  EAT FREE PIZZA !!! WED 10/17 CIVIL ENGINEERING WED 10/31 ENVIRONMENTAL ENGINEERING Both events: 12-1:20pm in Anderson 112
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EN 2 - Intro. to Engineering Graphics & CAD 3 vs. The Drawing-Model Dichotomy in CAD Systems Engineering drawings contain both “model” graphics and “drawing” graphics. Together they completely define a manufactured part, or the assembly of a few or a large number of parts.
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EN 2 - Intro. to Engineering Graphics & CAD 4 Graphics and text on an engineering drawing that are not part of the model’s geometry. For example, Center Lines Cross-hatching Notes Break Lines
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EN 2 - Intro. to Engineering Graphics & CAD 5 Drafting Graphics also includes: Dimension Lines Leaders
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EN 2 - Intro. to Engineering Graphics & CAD 6 Drafting Graphics  should always be the same size when  printed.   Drafting Graphics  size independent of the scale of the  printed geometry: Text height (typically 0.125”   or 3.2mm) Cross-hatch spacing Dash length of hidden lines Title Block size Drafting Graphics may need to be scaled relative to  Model Geometry  to make them appear correct on a  drawing.    For example,  if a floor plan is going to be printed at a scale of 1in. = 5ft,   the text height should be set 60 times larger than the desired print size (15”  for 0.1” text).
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EN 2 - Intro. to Engineering Graphics & CAD 7 Graphics that represent the size and shape of a  physical object or system either real or imagined. Model graphics may be two or three dimensional.
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EN 2 - Intro. to Engineering Graphics & CAD 8 ENGINEERING DRAWINGS ENGINEERING DRAWINGS Formal Standards Strict rules for appearance Fixed scale relative to paper Symbols define meaning . . . CAD MODELS CAD MODELS “Full Size” Geometry No rules for appearance Scaled to fit on paper after  creating Size and Shape define  meaning . . . vs.
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EN 2 - Intro. to Engineering Graphics & CAD 9 ENGINEERING DRAWINGS Dimension lines and notes  specify size Many orthographic views  define shape Dimension lines define  tolerances CAD MODELS CAD MODELS Reference CAD objects for size  and distances One model defines shape Created to  nominal  size, no  tolerance information vs.
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EN 2 - Intro. to Engineering Graphics & CAD 10 Dichotomy Drawings and Models are the same but different.
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EN2_F07_P06_Dim_STUDENT - EN 2 Engineering Graphics and CAD...

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