Technical Drawing

3 Tread

The first exercise is to draw a simple independent three tread unit laid out in first angle projection.

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.

For the purposes of this exercise the dimensions of the tread unit are as follows.

• Overall length of treads: 2000mm
• Overall height of treads: 600mm
• Width of tread: 200mm
• Height of tread: 200mm