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Oblique and Isometric Drawings GSMST

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Review Learning Objectives Sketch pictorials of an object (either oblique or isometric) given orthographic views of the object Select the best orientation of an object shown in pictorial Define what makes a drawing a: cavalier oblique, cabinet oblique, isometric, axonometric, perspective, or orthographic views

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Pictorial A three dimensional pictorial is a drawing that shows an objects three principal planes, much as they would be captured by a camera Sometimes they are called Technical Illustrations

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Types Obliques Cavalier Cabinet Axonometrics Isometrics Others Perspectives

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Types Obliques Cavalier Cabinet Axonometrics Isometrics Others Perspectives

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Types Obliques Cavalier Cabinet Axonometrics Isometrics Others Perspectives

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Cavalier Oblique Front view true size Receding Axis Angle (Normally 30°, 45° or 60°) is Variable Depth dimension (receding axis) true size

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Cabinet Oblique Front view true size Receding Axis Angle (Normally 30°, 45° or 60°) is Variable Depth dimension (receding axis) half size

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Side by Side Comparison Cavalier ObliqueCabinet Oblique

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Which is the cube ?

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Were you right?

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Angles in Oblique Angles in front view are drawn true size Other angles must be located using coordinates Appearance of angles may be distorted

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Circles in Oblique Drawn true size in front view Drawn as ellipses on receding planes Layout using a Rhombus

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Cylinders in Oblique Front and Back surfaces are circular Sides are drawn as lines tangent to the front and back

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Exercise Sketch an Oblique of a classical tombstone. Add a bullet hole through the stone.

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Types of Axonometrics

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Orientation of Pictorial Objects

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Isometrics Axes equally separated (120°) H, W, and D measurements are true size along iso. axes Angles must be located by coordinates Circles appear as ellipses on all surfaces

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Isometric Circles & Angles

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Isometric Ellipses

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The Isometric Ellipse Template

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Using the Ellipse Template

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Drawing Rounded Corners

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Construction of Cylinders Lightly block in the cylinder

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Construction of Cylinders Lightly block in the cylinder Sketch the upper and lower ellipses

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Construction of Cylinders Lightly block in the cylinder Sketch the upper and lower ellipses Connect the ellipses with Tangent lines

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Construction of Cylinders Lightly block in the cylinder Sketch the upper and lower ellipses Connect the ellipses with Tangent lines Darken the lines

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Practice Exercise Complete the orthographic views shown and Sketch an isometric of the part.

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