L08_1 - Type of Oblique Oblique Projection Angle α...

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    Oblique Projections GE 101 Engineering Graphics and  Design
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    Oblique Sketches Show exact size and shape of one face of an  object Object face with most detail parallel to view  plane Relatively easy to draw
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    Oblique Sketching Process 1 Single extruded feature Cut block; Cabinet oblique
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    Oblique Sketching Process 2 Curved features parallel to projection  plane; Cavalier oblique
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    Oblique Projection Geometry 1 One face of object  parallel to projection  plane Parallel sight lines  make an oblique  angle with projection  plane object image
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    Oblique Projection Geometry 2
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    Oblique Projection Angle ( α ) Angle of intersection  of sight line with  projection plane Determines type of  oblique projection  (Cavalier, Cabinet,  General)
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    Classes of Oblique Projections
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Unformatted text preview: Type of Oblique Oblique Projection Angle ( α ) Receding Axis Scale Cavalier 45 ° 1 Cabinet 63.43 ° 1/2 General 45 ° < angle < 63.43 ° ½ < scale < 1 Cabinet vs Cavalier Receding axis Oblique Projection Angle (2D) Determines receding axis scale Receding Axis Angle 1 Normally chosen to be 30 ° , 45 ° , or 60 ° Determines relative emphasis of receding planes Related to angle of rotation of projector about the projection plane normal ( β ) Receding Axis Angle 2 oblique projector normal Related to β , angle of rotation of projector about the projection plane normal Oblique Projections C’est tout!...
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