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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 object’s three principal planes, much as they would be captured by a camera Sometimes they are called Technical Illustrations

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**Types Obliques Axonometrics Perspectives Cavalier Cabinet Isometrics**

Others Perspectives

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**Types Obliques Axonometrics Perspectives Cavalier Cabinet Isometrics**

Others Perspectives

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**Types Obliques Axonometrics Perspectives Cavalier Cabinet 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 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 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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ISOMETRICS Isometric means “equal in measure” and refers to the fact that the three receding axes are tilted at 30°. Isometric drawings are constructed.

ISOMETRICS Isometric means “equal in measure” and refers to the fact that the three receding axes are tilted at 30°. Isometric drawings are constructed.

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