Slides - Orthogonal Drawing 1, 2 3 PDF PDF

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Download Slides - Orthogonal Drawing 1, 2 3 PDF PDF

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Types of Drawings

What are Orthogonal Drawings? Orthogonal projections ‘Third angle’ (used for Australian Standard Drawings)

Cut here and open ..or Cut here and open

s

Usual position for ‘plan’ view

View from rear

View from underneath

Locations of ‘unfolding’ are not critical, but views must be in their ‘projected’ positions

W

We don’t normally use hidden lines in engineering drawings

Shape must touch these 4 lines

W

Select the simplest, and least number of views to show the shape, Two views might not be enough

It is not always possible to construct an orthogonal drawing by completing one view at a time, because some of the geometry may be undetermined

L

L L Task: construct a plan view of the shallow hexagonal pyramid with a hole through it.

Start by drawing the basic pyramid. Then add the hole in the L separate views. Three views needed.

Oblique surfaces Apart from the complexity of drawing special curves, we want to see ‘true shapes’ to demonstrate that the object is cylindrical

Oblique surfaces We could simply ‘tip’ the object

Now, the main view is possibly confusing. Are the main corners at right angles?

Transferring dimensions This is called an ‘AUXILIARY projection’ 90°

W 90°...