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Oblique and IsometricDrawings
GSMST
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Review Learning Objectives
Sketch pictorials of an object (either obliqueor isometric) given orthographic views of the
objectSelect the best orientation of an objectshown in pictorial
Define what makes a drawing a: cavalier
oblique, cabinet oblique, isometric,axonometric, perspective, or orthographicviews
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Pictorial
A three dimensional pictorial is adrawing that shows an objects threeprincipal planes, much as they would becaptured by a camera
Sometimes they are called TechnicalIllustrations
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Cavalier Oblique
Front view true size
Receding Axis Angle
(Normally 30, 45or 60) is Variable
Depth dimension(receding axis) true
size
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Cabinet Oblique
Front view true size
Receding Axis Angle
(Normally 30, 45or 60) is Variable
Depth dimension(receding axis) half
size
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Side by Side Comparison
Cavalier Oblique Cabinet 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 vieware drawn true size
Other angles mustbe located usingcoordinates
Appearance of
angles may bedistorted
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Circles in Oblique
Drawn true size infront view
Drawn as ellipses onreceding planes
Layout using aRhombus
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Cylinders in Oblique
Front and Backsurfaces are circular
Sides are drawn aslines tangent to thefront and back
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Exercise
Sketch an Oblique of a classicaltombstone. 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 truesize along iso. axes
Angles must be locatedby coordinates
Circles appear asellipses on all surfaces
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Isometric Circles & Angles
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Isometric Ellipses
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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 thecylinder
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Construction of Cylinders
Lightly block in thecylinder
Sketch the upperand lower ellipses
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Construction of Cylinders
Lightly block in thecylinder
Sketch the upperand lower ellipses
Connect the ellipseswith Tangent lines
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Construction of Cylinders
Lightly block in thecylinder
Sketch the upperand lower ellipses
Connect the ellipseswith Tangent lines
Darken the lines
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Practice Exercise
Complete theorthographic
views shownand Sketchan isometricof the part.