Most people aren’t able to immediately pick up a pencil and start producing superb sketches that communicate everything about an idea. It is usually necessary to have someone show you a few of the basic rules about proportion, line and shape but ‘simple crating’ should allow you to make a really good start at sketching without too much pain and disappointment.
Crating and Sketching ~
The starting point is to draw a simple outline of the shape of your idea. A basic example is shown here where a the shape for a new camera, inspired by the work of Luigi Colani for example, is being considered.
The next step could be based on using either isometric grid paper (that can be downloaded easily from the web) or by using a 30 degree set square - and needs the rough grid that has been drawn over the outline shown here, to be drawn again but at a 30 degree angle.
The three coloured arrows shown here illustrate where main features of the original outline now appear on the ‘isometric’ grid. The third dimension can then easily be added by taking a second 30 degree
Before starting on paper you could try drawing using ‘virtual’ isometric grid paper by clicking on the picture link shown here.
Once you are confident about adding the depth to the simple example of the camera then try to add the depth showing the side view as it would appear if viewed from that direction. It is really as though you are combining two drawings from an orthographic drawing into the one picture.
So the side sketch goes here
The ‘front sketch