6 ISOMETRIC and orthographic projections

1. GROUP 7
ISOMETRIC AND
ORTHOGRAPHIC
PROJECTIONS

2. ISOMETIC
PROJECTION
Is a way of showing designs in three dimensions.In
order for a design to appear three dimensional,a
30°angle is applied to its side.Isometric drawing is a
projection which implies that the planes of an object are
projected onto three sloping planes.The best thing
about this is that each plane is in the same angle
relative to the 'picture plane'.This implies that since
each view has the same amount of distortion,we can
measure the length ,width and height of things using
real measurements

3. In an isometric view all lengths along the
coordinate axes are foreshorten,as none of these
axes lie in the image plane.An isometric projection
scales up the view to portray an object as closer
than it is allowing you to measure distances,e.g.on
a drawing .
The most perfect way to do an isometric
drawing is to assume a box which would
exactly hold the item you need to draw.Draw
the box,using light construction lines,to show
the height,length and width of the object.

4. STEPS IN ILLUSTRATING AN ISOMETRIC BOX

6. Any engineering drawing ought to show
everything:a total understanding of the object
should be possible from the drawing.If the isometric
drawing can show all details and all dimensions on
one drawing,it is ideal.And an isometric drawing
can be a great deal of information.However,if the
object in the image had a hole on the back side,it
would not be visible using a single isometric
drawing.In order to get a more complete view of the
object,an orthographic projection may be used.

7. ORTHOGRAPHIC
PROJECTION
Is a method of representing three-dimensional objects
on a plane having only length and breadth also
referred to as Right Angle Projection.It is a 2-D
representation of a 3-D object.The 2-D drawing
represents distinctive sides of an object.When
constructing an orthographic projection,we need to
incorporate enough views to completely depict the true
shape of the part wherein simple parts require less
views.The standard views are front,Top and Right Side.

9. STEPS IN
CREATING AN
ORTHOGRAPHIC
PROJECTION

17. Thank
you