What is the difference between first angle and third angle projection PDF?
What is the difference between first angle and third angle projection PDF?
The projection planes come between the object and observer. The plane of projection is taken as transparent in 3rd angle projection….Difference between First Angle Projection and Third Angle Projection :
| SR.NO | First Angle Projection | Third Angle Projection |
|---|---|---|
| 8 | It is widely used in Europe, India, Canada. | It is widely used in United State and Australia. |
What is 1st angle projection and 3rd angle projection?
To get the first angle projection, the object is placed in the first quadrant meaning it’s placed between the plane of projection and the observer. For the third angle projection, the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.
Why we dont use 2nd and 4th angle projection?
As per rule of projection when horizontal plane is rotated 90 degree in clockwise direction, top and front view will overlap. Overlapping projection views create confusion in the drawing. Therefore 2nd angle projection system is not used. Therefore fourth angle projection is also not used.
Who uses 3rd angle Projection?
The US, Canada, Japan and Australia are the only other regions that typically use 3rd Angle projection as standard. 3rd Angle project is where the 3D object is seen to be in the 3rd quadrant.
What do you mean by HT and VT of a line and a plane?
• Horizontal Trace (HT) The real or imaginary line of intersection of a plane. with the HP is called horizontal trace of the plane. HT is always located in the TV. • Vertical Trace (VT) The real or imaginary line of intersection of a plane with. the VP is called vertical trace of the plane.
What is HP and VP in engineering drawing?
Position 1: Parallel to two planes & perpendicular to the other In 3D In 2D Parallel to H.P. Front View – Parallel line to reference line Parallel to V.P. Top View – Parallel Line to reference line Perpendicular to P.P. Side View – Point on the side of front view V.P. a’ Fv b’ X Y a b H.P. TV Y a” P.P. .
https://www.youtube.com/watch?v=1_gzd-yQLuU
