3.3 methods of communication

Question 1

methods of communication

Answer 1

isometric projection

two-point perspective

third angle orthographic projection

dimensioning

nets (development)

Question 2

isometric projection

Answer 2

Isometric projection drawing is a way of presenting designs/drawings in three dimensions.

In order for a design to appear
three dimensional, a 30-degree angle is applied to its sides. Start all your drawings with a crate, using faint lines. A crate is a 3D frame that contains and guides your drawing. As your shape becomes clear to you draw its major lines in a firmer line. A 30°/60° set square can be sued to keep your angles correct.

Question 3

two-point perspective

Answer 3

They communicate overhead or suspended forms particularly well, and sections through structures that need to be seen spatially within an enclosure. Two-point perspective drawings have two vanishing points that enable you to draw shapes receding into the distance. The basics you will need to construct a Two-point perspective grid are a horizon and two vanishing points.

Question 4

third angle orthographic projection

Answer 4

Orthographic projections are among the most commonly used in the engineering industry to represent 3D components, structures and spaces in 2D. Orthographic Projection is a way of drawing an object from different directions. Usually, a front and plan view is drawn so that a person looking at the drawing can see all the important sides.

Question 5

dimensioning

Answer 5

Dimensions are measurements that are essential on most production drawings since they enable the engineer or builder to manufacture products and construct buildings accurately.

Question 6

The dimensioning standards are set by the British standards institution, rules include:

Answer 6

Each size should only be shown on the drawing once.
 Measurements should be shown in mm unless otherwise instructed.
 Circles should always be dimensioned using a diameter.
 Curves and arcs should always use a radius.

Question 7

Nets (developments)

Answer 7

Nets can be any material, including metals
and plastics.
Special cutters called Die Cutters, are pressed into the material to stamp out the nets/developments, which are then
folded by machines from the packages.