Projections of Line mechanical engineering and .ppt
- 1. ENGINEERING GRAPHICS Topic: Projection of Lines UNIT- 2
- 2. SIMPLE CASES OF THE LINE 1. A VERTICAL LINE ( LINE PERPENDICULAR TO HP & // TO VP) 2. A VERTICAL LINE ( LINE PERPENDICULAR TO VP & // TO HP) 3. LINE PARALLEL TO BOTH HP & VP. 4. LINE INCLINED TO HP & PARALLEL TO VP. 5. LINE INCLINED TO VP & PARALLEL TO HP. STUDY ILLUSTRATIONS GIVEN ON NEXT PAGE SHOWING CLEARLY THE NATURE OF FV & TV OF LINES LISTED ABOVE AND NOTE RESULTS. PROJECTIONS OF STRAIGHT LINES. INFORMATION REGARDING A LINE means IT’S LENGTH, POSITION OF IT’S ENDS WITH HP & VP IT’S INCLINATIONS WITH HP & VP WILL BE GIVEN. AIM:- TO DRAW IT’S PROJECTIONS - MEANS FV & TV.
- 3. X Y X Y b’ a’ b a a b a’ b’ B A TV FV A B X Y H.P. V.P. a’ b’ a b Fv Tv X Y H.P. V.P. a b a’ b’ Fv Tv For Tv For Tv Note: Fv is a vertical line Showing True Length & Tv is a point. Note: Fv & Tv both are // to xy & both show T. L. 1. 2. A Line perpendicular to Hp & // to Vp A Line // to Hp & // to Vp Orthographic Pattern Orthographic Pattern (Pictorial Presentation) (Pictorial Presentation)
- 4. A Line inclined to Hp and parallel to Vp (Pictorial presentation) X Y A B b’ a’ b a A Line inclined to Vp and parallel to Hp (Pictorial presentation) Ø a b a’ b’ B A Ø X Y H.P. V.P. T.V. a b a’ b’ X Y H.P. V.P. Ø a b a’ b’ Tv Fv Tv inclined to xy Fv parallel to xy. 3. 4. Fv inclined to xy Tv parallel to xy. Orthographic Projections
- 6. X Y b’ a’ b a A B For Tv Note: Fv & Tv both are // to xy & both show T. L. 1. A Line // to HP & // to VP Q: A line AB = 50 mm long. Endpoints A & B are 30 mm above HP & 20 mm in front of VP. Draw Projections. ANSWER (Pictorial Presentation)
- 7. A Line inclined to HP and parallel to VP Q: A line AB = 50 mm long is inclined to HP at 30 degree. Endpoints A & B are 20 mm in front of VP. Endpoint A is 30 mm above HP. Draw projections. And also draw trace of the line. X Y A B b’ a’ b a 2. Fv inclined to xy Tv parallel to xy. (Pictorial Presentation) ANSWER
- 8. A Line inclined to VP and parallel to HP Q: A line AB = 50 mm long is inclined to VP at 45 degree. The endpoints A & B are 30 mm above HP. Endpoint A is 20 mm in front of VP. Draw projections. Also locate the trace of the line. Ø a b a’ b’ B A Ø Tv inclined to xy Fv parallel to xy. 3. ANSWER (Pictorial Presentation)
- 9. X Y b(a) b’ a’ A B TV FV For Tv Note: Fv is a vertical line Showing True Length & Tv is a point. 4. A Line perpendicular to HP & // to VP Q: A line AB = 50 mm long is perpendicular to HP. The end points A & B are 20 mm in front of VP. Endpoint A is 15 mm above HP. Draw Projections & also locate the trace of the line. ANSWER (Pictorial Presentation)
- 10. 5. A Line perpendicular to VP & // to HP Q: A line AB = 50 mm long is perpendicular to VP. The end points A & B are 20 mm above HP. Endpoint A is 15 mm in front of VP. Draw Projections & also locate the trace of the line.
- 11. 6. A Line in VP Q: A line AB = 50 mm long is in VP. The end points A & B are 30 mm above HP. Draw Projections.
- 12. 7. A Line in HP Q: A line AB = 50 mm long is in HP. The end points A & B are 20 mm in front of VP. Draw Projections.
- 13. THANKS