Sketch: is the first graphic approach to the

shape of an object and is created using only

a pencil, paper and rubber. Sometimes it can

include measurements.

Plan is a type of technical representation. It

is usually made by rulers, compasses or

computers. A series of established rules must

be followed and the drawings can be made to

scale. It is always annotated

Annotating a drawing means indicating all of

its real measurements so that it can be

interpreted.

The annotation indicates the dimension lines,

the auxilary dimension lines, the dimensions

and the symbols.

Annotating follows a series of rules and

criteria.

Representing an object using views consists

of drawing it from various angles to make it

easier to understand.

The main views are the:

A) Front view:

B) Overhead view

C) Side view

Observe that in the dimensions of the three

views:

- The front and side views are the same height

- The front and overhead views are the same

width

- The overhead and side views are the same

depth

Most objects can not be represented in their

real dimensions.

The solution to this problem is to

proportionally reduce or amplify all the

dimensions of the object with a scale.

Scale= dimensions in the drawing

dimensions of the real object

There are three types of scales:

A) Reduced scale. Ex 1:2 what in the drawing

measures 1 measures 2 in the real life

Scale 1/10

B) Actual scale 1:1

C) Enlarged scale. Ex 2:1 what in the drawing

measures 2 measures 1 in the real life.