Chapter 11
Axonometric
& Oblique
Drawings
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Pictorial Drawings
Show several faces of an object at once
Uses?
Selling- Sales Literature
Manufacturing- (CNC paths exported or CAM)
Installation (IKEA step by step instructions)
Maintenance- Maintenance manuals
Design- Visualization to untrained eye
What is someone’s passion? (Add on Google)
Axonometric Projection:
Greek term Axon = Axis
Greek term metric = measure
Axonometric means:
parallel projection around an axis or axes
All 3 actual measurements are visible in one view
Width, height, depth
4 projection types:
Isometric vs. Non-isometric lines/ planes
True length/ size & shape represented
Isometric Planes
vs.
Non-Isometric
Planes
Exercise
Sketch This in
Isometric View
Up to this point we have used
Axonometric synonymously with
Isometric, but there are actually three
division of Axonometric projections
Classified by angles between the lines comprising the axonometric axes
Dimetric DrawingAngle between 2 axes same for 2 Surfaces
Other Surface is Foreshortened
Trimetric DrawingAngle between 2 axes different for all Surfaces
Isometric DrawingAngle between all axes equal
No Surface has more emphasis than any other
Steps involved in rotating about 2 axes to get
Isometric Projection
Isometric Plane- contains isometric lines
(any line parallel to one of legs of isometric axes)
Rotation about 2 axis results in foreshortened projection
of lines and faces and therefore we must increase the
projection by approximately 20% to get full scale
Standards for Isometric Drawings:
•Hidden lines omitted unless absolutely necessary to completely
describe part and not show in multi-view projection
(where only isometric is being shown)
•Centerlines omitted unless showing symmetry or for dimensioning
(where only isometric is being shown)
Section Views in Isometric Drawings:
Only used when necessary to clearly define internal features
2 Types
__________ and ____________
Oblique Drawing- 3D Axonometric representation
Where front is show in true size and shape
Common for Illustration purposes for furniture
Oblique Drawing and scales:
3 Types:
Cavalier- Full scale in height and depth
Cabinet- Half scale in depth, full scale in height
General- >half & < full scale in depth, full in height
Oblique Rules:
Longest Dimension parallel to frontal plane
Cylinder Rule- Overrides dimensional rule for clarity
Dimensioning Oblique Drawings:
Where only oblique drawing is given for illustration purposes
•Everything on frontal plan and limited dimensions in profile plane
•Dimension only in true shape or Cavalier projection
Summary:
3 classifications of Pictorials
•Axonometric
•Oblique
•Perspective
3 Classifications of Axonometric
•Isometric
•Dimetric
•Trimetric
If you do not create your
part on the right plane
and you have to rotate it
to where it is close to
isometric view what are
you really portraying?
Homework
Figure 11.75 (66)
Create a solid model of the part in solid works and place
in one of the axonometric projections that show the most
detail