PROJECTION'S
Name
the principal planes of projections.
There is two planes employed for projection and are known as reference planes or principle planes of projections. These planes intersect at right angles to each other. These are
1) Vertical plane: The plane which is vertical is called vertical plane and is denoted by V.P. Vertical plane is also known as Frontal Plane as front view is projected on this plane.
2) Horizontal plane: The plane which is horizontal and at right angle to the V.P is called Horizontal Plane and it is denoted by H.P.
What is the principle of projection?
If straight lines are drawn from various points on the contours of an object to meet a plane, the object is said to be projected on that plane. The figure formed by joining in correct sequence the points at which these lines meet the planes is called the projection of the object.
What is ground line (G.L.) or intersection or reference line?
The line of intersection of two principle planes of projections i.e. VP and HP is called reference or intersection or ground line and is denoted by x-y line.
What is an auxiliary view?
The view obtained on the auxiliary plane which is parallel to the inclined surface of an object is called auxiliary view.
Composed by: R.Satheesh, M.E., Asst Prof., email: rsatheeshemail@gmail.com.
