ENGINEERING DRAWING
ENGINEERING DRAWING INTRODUCTION
Engineering drawing, more commonly known as engineering
graphics, is the art of manipulating designs from a variety of components,
especially those related to engineering. It consists mainly of drawing the real
component, for example, a machine, with its exact dimensions. The scale of
dimensions is adjusted appropriately so that it fits properly to the contours
of the drawing sheet.
There are areas of particular focus, as in the case of
structural engineering, etc. Another consideration is with respect to the units
of measurement used; These could be not only metric or imperial, but the way
they are indicated is also relevant.
Engineering drawing is the most important aspect of
mechanical engineering, since it is the fundamental need to develop the design
and assembly of a machine. Although the interpretation of a component in terms
of sketches can be done in several methods, the three most necessary techniques
of drawing / projection are:
Perspective projection: this is a simple technique to draw
an object as you see one. The position of the observer's eye, the height and
distance of the object influence the result of the drawing.
Isometric projection: this projection form provides the
total detail of the component under consideration. The basic principle behind
the isometric projection is that it involves the consideration of three axes
that are inclined to each other forming equal angles (hence the name given that
iso means the same) to each other (120 degrees). This is followed by the
transfer of the real dimensions to the isometric scale that involves some basic
trigonometric calculations.