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# Orthographic projections

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Orthographic projections, Computer Aided Machine Drawing (CAMD) of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.

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• mahendra.hun@gmail.com

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### Orthographic projections

1. 1. Orthographic Projections Hareesha N G Dept of Aeronautical Engg Dayananda Sagar College of Engg Bangalore-7804/04/13 Hareesha N G, DSCE, Blore-78 1
2. 2. 3 Methods of Drawing Orthographic ProjectionsFirst Angle Projections Method Third Angle Projections Method Here views are drawn Here views are drawn by placing object by placing object in 1st Quadrant in 3rd Quadrant.( Fv above X-y, Tv below X-y ) SYMBOLIC ( Tv above X-y, Fv below X-y ) PRESENTATION OF BOTH METHODS WITH AN OBJECT STANDING ON HP ( GROUND) TV FV ON IT’S BASE. X Y NOTE:- X Y HP term is used in 1 Angle method st & FV TV For the same G L 04/04/13 Ground N G, DSCE, Blore-78 Hareesha term is used 2 in 3rd Angle method of projections
3. 3. FIRST ANGLE FOR T.V. PROJECTION IN THIS METHOD,HE OBJECT IS ASSUMED TO BESITUATED IN FIRST QUADRANT MEANS ABOVE HP & INFRONT OF VP. OBJECT IS INBETWEEN OBSERVER & PLANE. VP PP FV LSV . .V FO S R X Y R F. FO V. TV HP ACTUAL PATTERN OF PLANES & VIEWS IN 04/04/13METHODFIRST ANGLE Hareesha N G, DSCE, Blore-78 3 OF PROJECTIONS
4. 4. ORTHOGRAPHIC PROJECTIONS { MACHINE ELEMENTS } OBJECT IS OBSERVED IN THREE DIRECTIONS. THE DIRECTIONS SHOULD BE NORMAL TO THE RESPECTIVE PLANES. AND NOW PROJECT THREE DIFFERENT VIEWS ON THOSE PLANES. THESE VEWS ARE FRONT VIEW , TOP VIEW AND SIDE VIEW. FRONT VIEW IS A VIEW PROJECTED ON VERTICAL PLANE ( VP ) TOP VIEW IS A VIEW PROJECTED ON HORIZONTAL PLANE ( HP ) SIDE VIEW IS A VIEW PROJECTED ON PROFILE PLANE ( PP ) FIRST STUDY THE CONCEPT OF 1 ST AND 3 RD ANGLE PROJECTION METHODSND THEN STUDY NEXT 26 ILLUSTRATED CASES CAREFULLRY TO RECOGNIZE SURFACESERPENDICULAR TO THE ARROW DIRECTIONS 04/04/13 Hareesha N G, DSCE, Blore-78 4
5. 5. FIRST ANGLE FOR T.V. PROJECTION IN THIS METHOD,HE OBJECT IS ASSUMED TO BESITUATED IN FIRST QUADRANT MEANS ABOVE HP & INFRONT OF VP. OBJECT IS INBETWEEN OBSERVER & PLANE. VP PP FV LSV . .V FO S R X Y R F. FO V. TV HP ACTUAL PATTERN OF PLANES & VIEWS IN 04/04/13 METHODFIRST ANGLE Hareesha N G, DSCE, Blore-78 5 OF PROJECTIONS
6. 6. FOR T.V. 1 ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW FO R . F. V. S.V R FO x yPICTORIAL PRESENTATION IS GIVEN TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 6
7. 7. FOR T.V. 2 ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y FO . R S .V F. R V.FO TOP VIEWPICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 7
8. 8. FOR T.V. 3 ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW FO . R S.V FO R F. V. X Y TOP VIEWPICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION N G, DSCE, Blore-78 04/04/13 Hareesha METHOD 8
9. 9. 4 FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y . FO S. V R F. R V.FO TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 9
10. 10. FOR T.V. 5 ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW . S .V R FO FO R F. V. X Y TOP VIEWPICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY 04/04/13 ANGLE PROJECTION METHOD Blore-78 FIRST Hareesha N G, DSCE, 10
11. 11. 6 FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW . FO X Y S .V R R F.FO V. TOP VIEWPICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 11
12. 12. 7 FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW FO R F. V. . S .V R X Y FOPICTORIAL PRESENTATION IS GIVEN TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 12
13. 13. STUDY 8 FOR T.V. ZILLUSTRATIONS ORTHOGRAPHIC PROJECTIONS FRONT VIEW 50 X Y 20 25 FO R F. V. 25 20 TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 13
14. 14. 9 FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y FO . R F. S. V V. RFO TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 14
15. 15. 10 FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y . R S.VFO FO R F. V. PICTORIAL PRESENTATION IS GIVEN TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD 04/04/13 Hareesha N G, DSCE, Blore-78 15
16. 16. FOR T.V. 11 ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW FO R X Y F. V. . S .V RFO TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 16
17. 17. 12 FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y . FO R S.V F. R V.FO PICTORIAL PRESENTATION IS GIVEN TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD 04/04/13 Hareesha N G, DSCE, Blore-78 17
18. 18. STUDY 13 ZILLUSTRATIONS FOR T.V. ORTHOGRAPHIC PROJECTIONS 35 FV 35 10 x y 10 20 30 FO R 40 F. V. 70 TV O PICTORIAL PRESENTATION IS GIVEN 04/04/13 FV AND TV OF THIS OBJECT DRAW Hareesha N G, DSCE, Blore-78 18 BY FIRST ANGLE PROJECTION METHOD
19. 19. STUDY 14 Z ILLUSTRATIONS FOR T.V. ORTHOGRAPHIC PROJECTIONS FV 30 10 30 SV 30 10 30 x y . FO S. V R R F.FO V. ALL VIEWS IDENTICAL TV PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 19
20. 20. STUDY 15 Z ILLUSTRATIONS ORTHOGRAPHIC PROJECTIONS FOR T.V. ALL VIEWS IDENTICAL FV SV x y 10 40 60 . FO S.V R F.OR V. 40 TV 60 PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 20
21. 21. FOR T.V. ORTHOGRAPHIC PROJECTIONS 16 ALL VIEWS IDENTICAL FV SV x y 10 . FO S .V R R F. V.FO 40 60PICTORIAL PRESENTATION IS GIVEN 40 TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD 60 04/04/13 Hareesha N G, DSCE, Blore-78 21
22. 22. 17 ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW 30 SQUARE 40 20 50 FO . R 20 S. V F. X V. 10 Y RFO 30 O 60 F.V. S.V. PICTORIAL PRESENTATION IS GIVEN DRAW FV AND SV OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD 04/04/13 Hareesha N G, DSCE, Blore-78 22
23. 23. FOR T.V. ORTHOGRAPHIC PROJECTIONS 18 FV 40X 10 Y O 30 D 45 FO R F. V. O 10 50 PICTORIAL PRESENTATION IS GIVEN DRAW FV AND TV OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD 80 TV 04/04/13 Hareesha N G, DSCE, Blore-78 23
24. 24. 19 FOR T.V. ORTHOGRAPHIC PROJECTIONS FV 40X O 10 Y 100 10 25 FO R TV F. 10 30 10 25 V. 30 R O 20 D PICTORIAL PRESENTATION IS GIVEN DRAW FV AND TV OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD 04/04/13 Hareesha N G, DSCE, Blore-78 24
25. 25. PICTORIAL PRESENTATION IS GIVEN ORTHOGRAPHIC PROJECTIONS 20 DRAW FV AND TV OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD 30 FOR T.V. FV RECT. SLOT 10 50 35 10 X Y 20 D FO R TV F. V. 60 D 30 D TOP VIEW 04/04/13 Hareesha N G, DSCE, Blore-78 25 O
26. 26. 21 ORTHOGRAPHIC PROJECTIONS 10 25 15 25 40 10 25 FO . R S.V F. V. 25 RFO O O 80 25 F.V. S.V. PICTORIAL PRESENTATION IS GIVEN DRAW FV AND SV OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD Blore-78 04/04/13 Hareesha N G, DSCE, 26
27. 27. FOR T.V. 22 ORTHOGRAPHIC PROJECTIONS 450 30 FV 40 X Y 30 D FO R F. V. 40 TV OPICTORIAL PRESENTATION IS GIVEN 15 DRAW FV AND TV OF THIS OBJECT 40 BY 04/04/13 ANGLE PROJECTION METHOD Blore-78 FIRST Hareesha N G, DSCE, 27
28. 28. 23 ORTHOGRAPHIC PROJECTIONS FO HEX PART R F. 30 V. 20 20 . S.V 40 20 RFO O 50 20 15 O 30 100 60PICTORIAL PRESENTATION IS GIVEN FRONT VIEW L.H.SIDE VIEW DRAW FV ABD SV OF THIS OBJECT DSCE, Blore-78 04/04/13 Hareesha N G, 28 BY FIRST ANGLE PROJECTION METHOD
29. 29. FOR T.V. ORTHOGRAPHIC PROJECTIONS 24 20 40 FRONT VIEW F.V. 30 10 X Y O 10 30 FO R F. 10 V. 30 O 80PICTORIAL PRESENTATION IS GIVEN T.V. TOP VIEW DRAW FV AND TV OF THIS OBJECT 04/04/13 Hareesha N G, DSCE, Blore-78 29 BY FIRST ANGLE PROJECTION METHOD
30. 30. 25 ORTHOGRAPHIC PROJECTIONS 10 10 15 25 25X Y O 50 10 . FV LSV S .V FO R R FO F. V. PICTORIAL PRESENTATION IS GIVEN DRAW FV AND LSV OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD 04/04/13 Hareesha N G, DSCE, Blore-78 30
31. 31. PICTORIAL PRESENTATION IS GIVEN26 DRAW FV AND SV OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD ORTHOGRAPHIC PROJECTIONS FO R F. V. 30 20 10 20 15 10 15 . S .V R OFO 30 15 15 X Y 50 F.V. LEFT S.V. 04/04/13 Hareesha N G, DSCE, Blore-78 31
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