October 3rd - October 7th

posted Oct 2, 2016, 4:51 PM by Mr Becker   [ updated Oct 4, 2016, 5:46 AM ]

This week, we will be learning about sketching techniques, Orthographic Projection, and Isometric Projection.  

We have already done an exercise like these using Autodesk Inventor.  

This will give you a deeper understanding of these techniques, and allow you to convey this information without the aid of a computer.

We will go through some presentations in class on the different techniques, and you will be trying out what we go over.

Orthographic projection is used to show an object in true size or scale on a flat piece of
paper. When we look at an object, we see three dimensions (height, width, depth)
all at once. In an orthographic drawing, you will be looking at the object from three
different planes. When you look at the front, only two dimensions – height and
width – appear. From the top, the two dimensions are width and depth, and from
the right side, the height and depth are the dimensions.

Isometric drawing is 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.


Designs drawn in isometric projection are normally drawn precisely using drawing equipment. However, designers find ‘free hand’ sketching in isometric projection useful.

The mobile phone / music player opposite, has been sketched in free hand isometric projection. It allows the designer to draw in 3D quickly and with a reasonable degree of accuracy. The design is still drawn at a 30 degree angle, although this is estimated, rather than drawn with graphics equipment.

Limited colour/shade has been added to the menu of the phone. This means that the sketch is not presented entirely as a ‘plain’ design.

These drawings are quick sketches, that allow the designer to put his / her thoughts down on paper rapidly. This helps him/her develop an idea or design concept quickly, without the need for complex drawings, at an early stage in the design process.

In early meetings with a client, the designer can display 3D drawings of this type in order to ascertain if the design is developing the way the client wants.

Then we will work on Dimensioning.

The techniques are important because they help you visually convey what you want to build and how it will look.