Projections of planes ppt
- 1. Projection Of Planes Created By:- Viraj shah
- 2. INTRODUCTION A plane is a two dimensional object having length and breadth only. Its thickness is always neglected; various shapes of plane figures are considered such as square, rectangle, circle, pentagon, hexagon, etc.
- 4. Some of the planar projection are illustrated here
- 5. A Plane is a two dimensional entity having only length and breadth with negligible thickness which is considered as zero. TYPES OF PLANES Planes may be divided as two main types. They are (I) Perpendicular Planes (II) Oblique Planes. Perpendicular Planes Planes which are perpendicular to any one of the principal planes of projection are called as perpendicular planes. These planes may be inclined or parallel to the other principal plane.
- 6. Various positions of perpendicular planes (a) Planes perpendicular to V.P. And Parallel to H.P. Consider a plane perpendicular to V.P. And Parallel to H.P. The top view reveals the true shape of the plane the front view is a line parallel to xy line.
- 7. (b)Planes perpendicular to H.P. And Parallel to V.P. Consider a plane perpendicular to H.P. And Parallel to V.P. The front view shows the exact shape and size of the plane. The top view is a line parallel to xy line
- 8. (c) Plane perpendicular to both H.P. And V.P. Consider a plane in space which is perpendicular to both the H.P & V.P. Both the front view and top view of the plane appear as a straight lines on a single projector.
- 9. (d) Plane perpendicular to V.P. And inclined to H.P. Consider a plane perpendicular to V.P. And inclined at an angle to the H.P. The top view is shorter than its ture size. The front view is a line inclined at an angle to xy line .
- 10. (e) Plane perpendicular to H.P. And inclined to V.P. Consider a plane perpendicular to the H.P. And inclined at an angle to the V.P. The front view is shorter than its true size. The top view is a line inclined at an angle to xy line.
- 11. (f) Surface of the plane kept inclined to HP and VP or OBLIQUE PLANE Consider the plane to be inclined to both the surfaces that is the Horizontal plane and the Vertical plane
- 12. Example A plate having a shape of an isosceles triangle has base 50mm and altitude 70mm. It is so placed that in the front view it seen as an equilateral triangle of 50mm side and one side is inclined at 45 deg to xy .
- 13. SOLUTION Front view is seen as an equilateral triangle of 50mm side and one side is inclined at 45 deg to xy isosceles triangle has base 50mm and altitude 70mm. Projections of Planes Peculiar problem wherein plane surface is inclined to both the planes Draw the side view and rotate the side view to get the true inclinations with VP and HP as well as the top view. Don’t forget to denote the points with appropriate notations
- 15. Thank you