Working drawings contain the information needed to make an object, including:

• dimensions
• components
• materials
• assembly instructions

Working drawings normally use orthographic projection.

Some products may need a section drawing to give extra structural information, or an assembly drawing to show how parts fit together.

Orthographic projection

An orthographic projection of this shape is shown below

Orthographic projection uses a 2D drawing of each side of an object. Orthographic drawings usually consist of a front view, a side view and a plan view. A drawing board and parallel motionor T-square is used to project one view from another.

Orthographic drawing may be done using first angle projection or third angle projection.