Lesson 2: Orthographic Drawing
In industry the product is usually made by a different set of
people that create the designs. It is important to have a common
language. The British Standards Institution recommends ways of
displaying information on different types of drawings. These are
called conventions and are understood all over the world.
It is not always possible to draw your design to full size or
scale on the page. Sometimes the drawing would be too large to
fit onto the page or it would be too small to read the sizes.
Choose a scale and write it on the drawing. A full size drawing
is 1:1, a half size drawing is 1:2 and a drawing
shown at twice the size is 2:1.
A working drawing needs to show all the dimensions and
details needed to manufacture a product (all dimensions must be
shown in millimetres).
When producing an orthographic drawing you will generally produce
three views. A plan view, end elevation and a front
This is the view looking directly down on top of the object.
The Front Elevation
We are looking straight on at the front of the object. This view
normally carries most of the dimensions.
The End Elevation
This is either or sometimes both the remaining side views.
Hidden detail is shown by dotted lines and centre lines
are shown by dashed lines. Construction lines are best left
in the drawing do not rub them out. A link from this page shows
an example of an orthographic drawing of a candlestick
holder in first angle projection.
The drawing has guidelines, centrelines, dimensions and darker
finished lines. The drawing shows a front elevation, a side
elevation and a plan. The drawing also shows the symbol for
first angle projection.
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