Orthographic Drawings

Look at the drawing below. It is drawn in 3rd angle projection. Notice that there are three views, all of which are either exactly in line to one side or exactly in line above. The example shown gives a front view, a side view and a top view. These views are drawn with a drawing board and instruments. This type of drawing is called a working drawing.

It's a bit technical this section and you need a sharp pencil.

Working drawings are either full size or scaled if they are too big to fit on a page.All measurements are placed on the drawing to enable it to be made on the factory floor. When we add measurements we call it dimensioning.

Don't let measurements clutter the drawing. Keep them away from the drawing. Measurements should be read from the bottom or right hand side. Do not repeat dimensions if you all ready have them or they can be worked out from others you have on the drawing. Use arrowheads showing exactly where you are measuring from and to. Measurements should be in mm.

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