Isometrics - Isometric Pictorial Sketching Classification...

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1 Isometric Pictorial Sketching Classification of Sketches
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2 Isometrics • The Greek word Axon means Axis • And Metric means to measure • Axonometric projection is a parallel projection technique used to create a pictorial drawing of an object by rotating the object on an axis relative to a projection or picture plane • Axonometric drawings are classified by the angles between the lines comprising the axonometric axes. • Isometric- All three angles equal • Diametric- Two angles equal • Trimetric- No angles equal Advantages and Disadvantages Lines are scaled ( foreshortened ) but can find scaling factors Lines preserved but angles are not Projection of a circle in a plane not parallel to the projection plane is an ellipse Can see three principal faces of a box-like object Some optical illusions possible Parallel lines appear to diverge Does not look real because far objects are scaled the same as near objects Used in CAD applications
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3 Pictorial projection Not intended to give exact or true view. Not intended to transmit dimensions, although sometimes dimension is useful. Useful when the information and instructions to be given to non- technical and untrained people. Hidden lines are not shown in isometric drawing. Isometric projection Isometric projection is a true representation of the isometric view of an object Isometric view is created by rotating the object 45 degree about vertical axis, and tilting it forward 35 deg 16’
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4 Isometric Projection vs. Drawing • Isometric Projection is produced at a scale of 0.816 • Isometric projection is a true representation of the
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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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Isometrics - Isometric Pictorial Sketching Classification...

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