1. WORKING DRAWINGS
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2. Theory of Shape Description
When describing three dimensional objects we normally consider the part as having;
length, width and height or
width, depth and height or
length, width and thickness
General Rule:
Distances from left to right are referred to as width or length.
Distances from front to back as depth or width, and vertical distances as heights.
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3. Orthographic Projection
What are Orthographic Views?
the view you would see looking directly at one side or "face" of the object.
describes the features of the object completely and accurately
helps to visualize the part
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4. Orthographic Projection
Types of Orthographic Views:
One view drawings: objects requiring one view only to describe it (ie. templates/paper/balls/cylindrical objects)
Two view drawings: objects that require two views to completely describe it (Ie. discs/gears/wheels)
Multi-view drawings: objects that require at least three views to completely describe it. Each view represents a different side or face of the object. The view is projected one from the other and arranged systematically
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5. General Rules for Selection of Views
draw views necessary to fully explain shape
the front view shows the width or length of the object and gives the most information about its shape.
when the longest dimension is drawn in the horizontal position, the object will seem more balanced.
choose views which will show most of the features as "visible" thus avoiding use of hidden lines.
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6. Orthographic Views
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12. Fully Defining Objects
determining views
divide part into features
check that features are represented on all views
balance a drawing
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