Oblique Projection

1
Oblique Projection

• Chapter 15

2
Oblique Projections

• In oblique projections, the projectors are
  parallel to each other but are not perpendicular
  to the plane of projection
• One of the objects principal faces is parallel
  to the plane of projection

3
Oblique Projections
4
Cavalier Projection

• When the receding lines are true length, and the
  projectors are at 45 degrees to the plane of
  projection, the oblique drawing is called
  cavalier projection

5
Cabinet Projection

• When the receding lines are drawn to half size,
  the drawing is known as a cabinet projection

6
Cavalier and Cabinet Projection of a 1 Unit Cube
7
Offset Measurements

• Circles, circular arcs, and other curved surfaces
  are drawn using offset measurements

8
Angles in Oblique Projection

• When an angle is specified in degrees in a
  receding plane, convert the angle into linear
  measurements to draw the angle in an oblique
  drawing

9
Angles in Oblique Projection
10
Screw Threads in Oblique

• Partial circles spaced equally show symbolic
  thread pitch

11
Oblique Dimensioning

• Oblique drawings are dimensioned in a similar
  fashion as isometric drawings

12
Computer Graphics

• Using CAD, oblique drawings can be created by
  using snap increments and drawing similarly to
  drawing on grid paper
• If a complicated pictorial is needed however, it
  may be easier and more accurate to create a 3D
  model

13
Engineering Text Example
14
Draw a cabinet oblique sketch for the piece of
furniture.