Types of Drawings

Freehand Sketching: the spontaneous representation of ideas on paper without the use of technical aids

• often includes annotations
• used in the early stages,
• quick but not very accurate
• easy for the client to understand the basics

Orthographic Drawings: a series of flat views of an object showing it exactly as it is in shape and size

• shows details and dimensions thus could be used as a production drawing
• always to scale and are produced at the final production stage
• used in the realization stage

Isometric Drawing: a 3D representation of an object drawn with the horizontal plane at 30 degrees to the vertical plane

• used to communicate the proposed solution in 3D
• the isometric lines are angled at 30 degrees
• could be produced by traditional drawing instruments as well as CAD

Exploded Isometric Drawing:an isometric drawing of an object with more than one component that depicts how the parts of assemblies fit together.

• shows the components and the sequence of assembly
• could be used for a manual for assembly

Perspective Drawing: A 3D drawing that realistically represents an object by utilizing foreshadowing and vanishing points.

• take into account spatial arrangement
• very realistic
• create illusion of depth and distance
• used to convey information to non technical people