representation technology school
TRANSCRIPT
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.