oblique and isometric drawings gsmst. review learning objectives sketch pictorials of an object...
TRANSCRIPT
Oblique and Isometric Drawings
GSMST
Review Learning Objectives
Sketch pictorials of an object (either oblique or isometric) given orthographic views of the objectSelect the best orientation of an object shown in pictorialDefine what makes a drawing a: cavalier oblique, cabinet oblique, isometric, axonometric, perspective, or orthographic views
Pictorial
A three dimensional pictorial is a drawing that shows an object’s three principal planes, much as they would be captured by a cameraSometimes they are called Technical Illustrations
Cavalier Oblique
Front view true sizeReceding Axis Angle (Normally 30°, 45° or 60°) is VariableDepth dimension (receding axis) true size
Cabinet Oblique
Front view true sizeReceding Axis Angle (Normally 30°, 45° or 60°) is VariableDepth dimension (receding axis) half size
Side by Side Comparison
Cavalier Oblique Cabinet Oblique
Which is the cube ?
Were you right?
Angles in Oblique
Angles in front view are drawn true sizeOther angles must be located using coordinatesAppearance of angles may be distorted
Circles in Oblique
Drawn true size in front viewDrawn as ellipses on receding planesLayout using a Rhombus
Cylinders in Oblique
Front and Back surfaces are circular“Sides” are drawn as lines tangent to the front and back
Exercise
Sketch an Oblique of a “classical” tombstone. Add a bullet hole through the stone.
Types of Axonometrics
Orientation of Pictorial Objects
Isometrics
Axes equally separated (120°)H, W, and D measurements are true size along iso. axesAngles must be located by coordinatesCircles appear as ellipses on all surfaces
Isometric Circles & Angles
Isometric Ellipses
Using the Ellipse Template
Drawing Rounded Corners
Construction of Cylinders
Lightly block in the cylinder
Construction of Cylinders
Lightly block in the cylinderSketch the upper and lower ellipses
Construction of Cylinders
Lightly block in the cylinderSketch the upper and lower ellipsesConnect the ellipses with Tangent lines
Construction of Cylinders
Lightly block in the cylinderSketch the upper and lower ellipsesConnect the ellipses with Tangent linesDarken the lines
Practice Exercise
Complete the orthographic views shown and Sketch an isometric of the part.