Fig. 1 shows the standard symbol used on an engineering drawing to indicate a type of orthographic projection. The product has been designed to be both func...
Question 1 Report
Fig. 1 shows the standard symbol used on an engineering drawing to indicate a type of orthographic projection. The product has been designed to be both functional and aesthetically pleasing. It is constructed from a combination of materials chosen for their properties and suitability. The designer has considered the needs of the user and the environment in which it will be used.
The sides are smooth. It cuts in a line. The handle is round. It can be used on its own.
(a) Name the type of projection indicated by this symbol. [1]
(b) State two ways that third angle projection differs from first angle projection in the arrangement of the views. [2]
[Total: 3 marks]
Answer Details
(a) The type of projection indicated by this symbol is third angle projection [1]. The symbol shows a truncated cone (frustum) in a specific arrangement: the front view of the cone appears on the left, and the circular end view appears to the right. This layout, where views are placed on the same side as the direction from which they are seen, is the defining feature of third angle projection.
(b) Two differences between third angle and first angle projection in the arrangement of views:
- In third angle projection, the plan view (top view) is placed above the front elevation, because you look down at the object and place the view in the direction you are looking from. In first angle projection, the plan view is placed below the front elevation, because the view is projected through the object onto the plane behind it [1].
- In third angle projection, the side view is placed on the same side as the direction from which it is viewed. For example, a view looking from the right is placed to the right of the front elevation. In first angle projection, the side view is placed on the opposite side: a view looking from the right is placed to the left of the front elevation [1].
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