1. Views And Techniques
Interpreting Drawings is one section of theory which will be tested in your final exams. The slides contain the following information.
Drawing classifications
Identifying marks/properties of drawings
Orthographic
Planometric
Oblique
Isometric
Perspective
Assembly Instructions

2. Views And Techniques Orthographic Drawings only show one face.
Most common orthographic projection system is third angle projection.
Third angle projection symbol
The third angle projection symbol shows the layout of the views in relationship to one another
Object is drawn in 4, 2D views:
Elevation
Plan
End Elevation (x2)

3. Views And Techniques Pictorial Drawings
Any Drawing which shows three dimensions is classified as
a Pictorial Drawing, the following drawings are all pictorial
drawings.
Planometric
Oblique
Isometric
1pt Perspective
2pt Perspective

4. Views And Techniques Planometric
Base is a true plan rotated at an angle of 300, 450 or 600.
All vertical edges remain vertical.
All measurements on base are true.
Heights are full size.
Tips: Always start by drawing the full Plan

5. Views And Techniques Oblique
Front of the object is shown as its TRUE FACE.
Breadths are projected back at 450
All breadths are cut to HALF SIZE.
Obliques are used quite often when there are circles on the front face because they can be drawn using a compass.

6. Views And Techniques Isometric
Heights are projected vertically upwards.
Lengths and breadths are projected at 300
All measurements along the height, length and breadth are full size.

7. Views And Techniques Exploded Isometric
Designers use ‘exploded’ views, often drawn in isometric projection, to show parts of products that are hidden from sight. For example, all the parts of the object, drawn above, can be seen because it has been taken apart using the drawing technique called 'Exploded Isometric Projection'.

8. Views And Techniques 1pt Perspective There is one vanishing point.
Perspective drawings are sketched, although a straight edge is used.
There is no accurate measuring in perspective drawing.
The drawing starts from a face rather than an edge.

9. Views And Techniques 2pt Perspective There are two vanishing points
Perspective drawings are sketched, although a straight edge is used.
There is no accurate measuring in perspective drawing
A leading edge is used to start the drawing.
Tips: Build up the drawing using rectangles
Use a cross to find the centre

10. Views And Techniques Assembly Drawing
In an exam you will be asked to identify certain parts, part numbers or names. All of the information required will be in front of you. You must be able to read the drawing in order to answer the questions.