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TOPICS OF ENGINEERING GRAPHICS (Mechanical Portion) ( C ) ORTHOGRAPHIC PROJECTIONS FROM GIVEN ISOMETRIC VIEW ( D ) ISOMETRIC VIEW/PROJECTIONS FROM GIVEN.

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Presentation on theme: "TOPICS OF ENGINEERING GRAPHICS (Mechanical Portion) ( C ) ORTHOGRAPHIC PROJECTIONS FROM GIVEN ISOMETRIC VIEW ( D ) ISOMETRIC VIEW/PROJECTIONS FROM GIVEN."— Presentation transcript:

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2 TOPICS OF ENGINEERING GRAPHICS (Mechanical Portion) ( C ) ORTHOGRAPHIC PROJECTIONS FROM GIVEN ISOMETRIC VIEW ( D ) ISOMETRIC VIEW/PROJECTIONS FROM GIVEN ORTHOGRPHIC VIEWS Without Sections With Sections View i.e. drawingProjections Topic no. Topic ContentNo. of Lectures 07 05

3 TYPES OF LINES USED IN ENGINEERING DRAWING APPLICATIONS OF LINES ON DRAWING G2G2 CUTTING PLANE LINE (IN T.V) CONTINUOUS THICK A A G1G1 CUTTING PLANE LINE (IN F.V) G1G1 B CONTINUOUS THIN (WAVY) B C SHORT ZIGZAG THIN C D D D CONTINUOUS THIN D E SHORT DASH MEDIUM (DOTED LINE ) E F LONG CHAIN THIN (CENTER LINE) F

4 Trimmed and untrimmed drawing sheet sizes are commercially designated as A 0 (Maximum size), A 1, A 2, A 3, A 4 & A 5 (Least size). In Engineering Graphics term work, all the 4 sheets will be of A 2 (approximately ½ Imperial) size The following two systems are adopted for dimensioning purposes on orthographic views as well as on pictorial view. Dimensioning Techniques

5 20 35 ALIGNED SYSTEM (FOR A 2 TO A 5 SHEET SIZE) UNIDIRECTIONAL SYSTEM (FOR LARGE SIZED SHEETS) ARROW HEADS (H x 3H) 3H H

6 ORTHOGRAPHIC PREOJECTIONS (MULTI VIEW REPRESENTATIONS i.e. F.V., T.V. & S.V. – L.H.S.V OR R.H.S.V) FROM ISOMETRIC VIEW PLANES OF PROJECTIONS QUADRANTS VISION DIRECTIONS

7 SCALING OF A DRAWING (Full Size 1:1, Reduced 1:2 or Enlarged 5:1 ) VIEWES METHODS OF PROJECTIONS WITH THEIR SYMBOLS

8 (AS PER BUREAU OF INDIAN STANDARDS FOR ENGINEERING DRAWING.) SCALING OF A DRAWING RECOMMENDED SCALES 1.FULL SCALE e.g. 1: 1 In certain cases the engineering components may be very large or very small for drawing purposes, hence the corresponding scale may be preferred from the following

9 3.ENLARGED SCALE e.g. 50:1, 20:1, 10:1, 5:1, 2:1 2.REDUCED SCALE e.g. 1:2, 1:2.5, 1:5, 1:10, 1:20, 1:15, 1:100, 1:200, 1:500, 1:1000, 1:2000, 1:5000, 1:10000

10 SYMBOLS USED ON ENGINEERING DRAWING SHEET FIRST ANGLE METHOD OF ORTHOGRAPHIC PROJECTIONS THIRD ANGLE METHOD OF ORTHOGRAPHIC PROJECTIONS M/c. PARTS ARE NEVER ASSUMED IN SECOND OR IN FOURTH QUADRANT, AS THE VIEWS MAY OVERLAP ON ONE ANOTHER ABOVE XY OR BELOW XY RESPECTIVELY.

11 HP VP PP ISOMETRIC VIEW OF FIRST ANGLE METHOD OF PROJECTIONS (FOR L.H.S.V.) Z1Z1 L.H.S.V. T.V. L F.V. L X F.V. Plane T.V. Plane L.H.S.V. Plane Y D H Y X H D OBJECT IN FIRST QUADRANT (FOR L.H.S.V.)

12 Fig. 2(c) shows turning of the planes H.P & P.P with their respective hinges, considering V.P as fixed plane. b)F.V is within L & H, T.V is within L & D, While L.H.S.V is within H & D. It may be noted that :- (a) F.V. (X directional view) is on V.P, T.V. (Y directional view) is on H.P, while L.H.S.V (Z 1 directional view) is on P.P c)The symbol for I st angle method of projections is placed as shown on fig. 2(c)

13 Fig. 2(c) X Y H.P T.V. L V.P F.V. L.H.S.V. D P.P H

14 AIM: Fig. 2(a) shows the Pictorial (ISOMETRIC) view of a cut block. Draw its following orthographic views using I st angle method of projections. I.Front View II.Top View III.R. H. S.View

15 X Fig 2(b) P.P H D R.H.S.V. Z2Z2 Y X V.P L F.V. H.P T.V. Z2Z2 L D H Fig 2(a) X Y YY

16 Note : I st angle means, the block is assumed in front of V.P, above H.P and inside P.P, as in fig. 2(b) where the F.V. is projected on V.P, seen in X direction, T.V. is projected on H.P, seen in Y direction & R.H.S.V. is projected on P.P, seen in Z 2 direction

17 It may be noted that :- a)F.V. (X directional view) is on V.P, T.V. (Y directional view) is on H.P, while R.H.S.V (Z 2 directional view) is on P.P Fig. 2(c) shows turning of the planes H.P & P.P with their respective hinges, considering plane V.P as fixed plane. b)F.V is within L & H, T.V is within L & D, While R.H.S.V is within H & D. c) The symbol for I st angle method of projections is placed as shown on fig. 2(c)

18 Fig. 2(c) H.P T.V. L F.V. V.P X Y R.H.S.V. D P. P H

19 AIM: Fig. 3(a) shows the Pictorial (ISOMETRIC) view of a cut block. Draw its following orthographic views using III rd angle method of projections. I.Front View II.Top View III.Left Hand Side View

20 T.V. H.P H L.H.S.V. P.P D X Y Z1Z1 X Y V.P F.V. L Fig 3(b) Y Z1Z1 X D H L Fig 3(a) Plane H.P turned up(above V.P) Plane P.P turned side way(towards left side of plane V.P)

21 Note : III rd angle means, the block is assumed behind V.P, below H.P and inside P.P, as in fig. 3(b) where the F.V. is projected on V.P, seen in X direction, T.V. is projected on H.P, seen in Y direction & L.H.S.V. is projected on P.P, seen in Z 1 direction

22 c)The symbol for III rd angle method of projections is placed as shown on fig. 3(c) b)F.V is within L & H, T.V is within L & D, While L.H.S.V is within H & D. Fig. 3(c) shows turning of the planes H.P & P.P with their respective hinges, considering plane V.P as fixed plane. It may be noted that :- a)F.V. (X directional view) is on V.P, T.V. (Y directional view) is on H.P, while L.H.S.V (Z 1 directional view) is on P.P

23 T.V. 4 D 6 L.H.S.V H 2 F.V. L X Y Fig. 3(c)

24 AIM: Fig. 4(a) shows the Pictorial (ISOMETRIC) view of a cut block. Draw its following orthographic views using III rd angle method of projections. I.Front View II.Top View III.Right Hand Side View

25 X Y X Y R.H.S.V. H P.P D Z2Z2 Fig. 4(b) Planes H.P, V.P & P.P are assumed as transparent Y Z2Z2 Fig. 4(a) X H. P D L T.V. V.P H L F.V.

26 Note : III rd angle means, the block is assumed behind V.P, below H.P and inside P.P, as in fig. 4(b) where the F.V. is projected on V.P, seen in X direction, T.V. is projected on H.P, seen in Y direction & R.H.S.V. is projected on P.P, seen in Z 2 direction.

27 b)F.V is within L & H, T.V is within L & D, While R.H.S.V is within H & D. c)The symbol for III rd angle method of projections is placed as shown on fig. 4(c) Fig. 4(c) shows turning of the planes H.P &P.P with their respective hinges, considering plane V.P as fixed plane. It may be noted that :- a)F.V. (X directional view) is on V.P, T.V. (Y directional view) is on H.P, while R.H.S.V (Z 2 directional view) is on P.P

28 Y X H.PH.P T.V. D V.PV.P F.V. L Fig. 4(c) P.PP.P R.H.S.V. H

29 Step by step procedure Suggested to prepare Orthographic views (First angle method) for The simple component Shown pictorially in figure

30 R40 Ø40 ISOMETRIC VIEW X

31 R ø TOP VIEW FRONT VIEW R.H.S.V SCALE: 1:1 SYMBOL IS NOT MARKED 20 R20

32 FIGURE SHOWS ISOMETRIC VIEW OF A SIMPLE OBJECT(WITHOUT DIMENSIONS) SHOW ITS THREE ORTHOGRAPHIC VIEWS Use First Angle Method 1.Front View 2. Top View 3. L.H.S.View A B a b 3 c 2 1

33 F.V T.V L.H.S.V. B a b c b 3 A

34 FIGURE SHOWS ISOMETRIC VIEW OF AN OBJECT(WITHOUT DIMENSIONS) SHOW ITS THREE ORTHO GRAPHIC VIEWS Use Third Angle Method 1.Front View 2. Top View 3. L.H.S.View 1.Front View 2. Top View 3. L.H.S.View A a b 3 c 2 1

35 FRONT VIEW L.H.S VIEW TOP VIEW A a b 3 c 2 1

36 Aim : Figure shows isometric view, of a simple machine component. Draw its following Orthographic views, & dimension them. 1. Front View 2. Top View 3. R.H.S. View Use First Angle Method of projection

37 10 Figure, is the isometric view R25 30 X Figure L = 75+25=100 H = 10+30=40 D=50

38 R F.V T.V. R.H.S.V. ORTHOGRAPHIC VIEWS F.V L=100 H=40 T.V L=100 D=50 S.V D=50 H=40

39 SQ 15 SQ 10 Ø30,Depth SQ ISOMETRIC ORTHO. VIEWS

40 25 Sq Sq 40 Sq Ø R.H. S.V. F.V. T.V.

41 F igure shows the isometric view of a vertical shaft support. D raw its all the three views, using first angle method of projections. G ive the necessary dimensions as per aligned system. Exercise :-

42 ISOMETRIC VIEW 140 Ø40 Ø

43 Ø40 50 Ø L.H.S.V FRONT VIEW TOP VIEW

44 Isometric view of a rod support is given. Draw its all the three orthographic views, using first angle method of projections. Give all the dimensions. Exercise :-

45 ISOMETRIC VIEW Ø24 R X

46 TOP VIEW R FRONT VIEW RIGHT SIDE VIEW SCALE: 1:

47 R R ISOMETRIC ORTHO. VIEWS

48 R8 R

49 SECTIONING OF A MACHINE COMPONENT BY ANY ONE SECTION PLA NE,OUT OF THREE FOLLOWING MENTIONED SECTION PLANES

50 (1)BY A VERTICAL SECTION PLANE (PARALLEL TO PRINCIPLE V.P.) Hence, (a)The real or true shape of the section is observed in its F.V. (b)Section plane will be seen as a cutting plane line (similar to center line,thick at ends) with corresponding horizontal vision direction arrows at the center of thick ends in its T.V. & S.V.

51 (2)BY A HORIZONTAL SECTION PLANE Hence, (a)The real or true shape of the section is observed in its T.V. (b) The cutting or section plane will be observed as a cutting plane line (similar to center line,thick at ends) with the corresponding vertically downward vision direction arrows at the center of the thick ends in its F.V. and in S.V.

52 (3) BY A SECTION PLANE, NORMAL TO BOTH H.P. AND V.P.(i.e. parallel to profile plane or side view plane) Hence, (a)The real or true shape of the section is observed in its S.V. (b) The cutting or section plane will be observed as a cutting plane line (similar to center line,thick at ends) with the corresponding vertically downward vision direction arrows at the center of the thick ends in its F.V. and in T.V.

53 R A B X Figure shows isometric view of a machine component. Draw its (1)Front view, Top view & L.H.S View, using 3 rd angle method of projections. (2)Sectional Front view, Top view & L.H.S.V., using 3 rd angle method of projections.

54 Front View Top View L.H.S.View 1. X Ortho. Views (No sectioning)

55 A B Retained split of the machine parts X It will be nearer to V.P. in 1 st angle method & against the vertical plane in 3 rd angle method.

56

57 Ø30 Ø A A X Figure shows the pictorial view of a machine component. Draw its following views as per First angle method of projections (1) Front view from X direction. (2) Sectional top view-AA (3) L.H.S. View

58 Sketch shows the assumed cut model (retained part of the machine component / split against the observer) due to horizontal section plane passing through AB. X

59 Ø30, 7 deep Ø F.V. Sectional T.V. L.H.S.V. A A AA

60 R10 X A B Figure shows the pictorial view of a machine components. Draw its following views, using 3 rd angle method of projections. (1) Front view from arrow X (2) Top View (3) Sectional R.H.S.V - AB

61 B A Retained split of the machine parts Retained split, will be nearer to V.P. in 1 st angle method & against the vertical plane in 3 rd angle method. No hatching in this area as not contained in the section plane

62 A A A F.V. T.V. SEC. R.H.S.V

63 HALF SECTION SPECIAL SECIONS

64 A C B HALF SECTIONAL F.V.-AB HALF SECTIONAL LEFT S.V.-BC TOP VIEW

65 REMOVED & REVOLVED SECTIONS SPECIAL SECTIONS

66 REMOVEDSECTION REVOLVED SECTION REMOVED SECTION

67 REVOLVED SECTION

68 REMOVED SECTION

69 REMOVED SECTIONS


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