CGT 110 Lecture 3-1

CGT 110 Lecture 3-1 - End points of an angled line must be...

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Pictorial Drawings
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Technical illustration showing several faces of an object at once Used in technical documentation,sales literature, maintenance manuals Axonometric [isometric, dimetric, and trimetric], oblique (obsolete), one, two, and three point perspective
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Move point of view to look down long diagonal of a cube (35° 16”) Isometric axes 120° apart Faces have equal distortion Project distances from orthogonal axes to the isometric axes (foreshorten to 81%)
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Draw front face true size Select convenient angle for receding axes (45° or 30°) Transfer distances from orthogonal axes along receding axes (scale if required)
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See fig. 3.33
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Draw Isometric axes 120° apart Orient front, top, and side views Transfer dimensions from principal axes to isometric axes Measure components of inclined and oblique features along orthogonal axes and transfer components to the corresponding isometric axes
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Angles can not be measured directly on isometric  drawings.
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Unformatted text preview: End points of an angled line must be located using x,y,z coordinates. Draw Isometric Box Draw normal features on top, front and side isometric plane Only transfer distances parallel to the orthogonal axes to be parallel to the corresponding isometric axes Do not foreshorten Box in components of other features Join ends to form non-isometric features Drawing a circle as an ellipse True ellipse construction (Pg. 141-2) Four Center Approximation (Pg. 93) Isometric ellipse template (Pg. 94) Sketch inside isometric “square” Isometric arc is a partial isometric circle Orientation of ellipse Sketch isometric center lines at the appropriate orientation Sketch in isometric “square” at the diameter of the circle Sketch ellipse within “square” (as is done when sketching circle for an orthogonal view) Source: FreightCar America Bring both books and sketching supplies....
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This note was uploaded on 02/19/2012 for the course CGT 101 taught by Professor Mohler,j during the Fall '08 term at Purdue University.

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CGT 110 Lecture 3-1 - End points of an angled line must be...

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