creat by milan vaghani

1. Name : Vaghani Milan
: Shubham Patel
En.No :140420129027
:140420129026
Branch:textiles technology

2.  Orthographic Projection is a method of
representing a three dimensional object on paper
using several two dimensional views.
 It is the international language of Engineers and
Designers

3.  We look directly at the different faces of the object
(90˚ to the face) and draw the lines that we see.

4.  One view is never enough to describe an object.
 We need at least two views to accurately describe
even the most simple of objects.
 Generally we se three views and arrange them as
shown in the movie
 You can use as many views as the object
requires.

6.  Yes. However America and Australia arrange the
views differently.
 This arrangement of views is called third angle
projection.

8.  Each method has its own symbol and they are as
follows
 First angle projection
 Third angle projection

9.  The recommended proportions for the symbol are
as follows

10.  The name first angle is derived from the objects
position in the first quadrant of the planes of
reference.
 The name third angle is derived from the objects
position in the third quadrant of the planes of
reference.

12.  Sometimes features of an object are hidden (for
example they are at the back of the object)
 To show these features we add dashed lines in
their place.
 If a dashed line meets a thick line leave a gap as
shown.

14.  If there is too much hidden detail and the drawing
becomes confusing use a sectional view.
 Draw the Hatching lines at 45˚ as shown
 Always place the section line (the dashed line that
ends in arrows) exactly were you are cutting the
object.

16.  Make sure you keep your drawing neat.
 Recommended proportions are shown below.
 Keep construction lines light and finished lines
heavy