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| [[Image:Mortice.jpg]] [[Image:Housings.jpg]] | | [[Image:Mortice.jpg]] [[Image:Housings.jpg]] |
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| == 3 Tread ==
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| The first exercise is to draw a simple independent three tread unit laid out in first angle projection.
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| Below is an example of first angle projection. The projection lines are still visible; these lines show how sizes can be transferred from one view to another.
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| For the purposes of this exercise the dimensions of the tread unit are as follows.
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| *Overall length of treads: 2000mm
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| *Overall height of treads: 600mm
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| *Width of tread: 200mm
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| *Height of tread: 200mm
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| [[Image:3tread.jpg |800px]]
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| == Arched Window ==
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| The second exercise is to draw a flat in first angle projection that has an arched window inset in the centre of the flat. There is an example for reference in the following pages.
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| For the purposes of this exercise the dimensions are as follows.
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| *Overall height of the flat: 3000mm
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| *Overall width of the flat: 2000mm
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| *Width of arched window: 1200mm
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| *Height of arched window: 2000mm
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| *Radius of arch: 600mm
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| *Height of window from base of flat: 600mm
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| *Thickness of flat: 25mm
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| *Depth of window return: 200mm
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| [[Image:Archplan.jpg | 400px]]
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