Full Notes Unit 2 Section of Solids 14.12.2020.pptx

Full Notes Unit 2 Section of Solids

1. Wednesday, January 6, 2021 1 Presented by Dr. N. Nagaprasad , Asst. Professor / Dept. of Mechanical Engg ., Engineering Graphics Section of Solids

2. Cross section of residential building : Wednesday, January 6, 2021 2

3. UNIT II SECTION OF SOLIDS Section of solids - simple position with cutting plane parallel, perpendicular and inclined to one of the plane . TEXT BOOKS: 1. Natarajan K.V., “A Text book of Engineering Graphics”, Dhanalakshmi Publishers, (2006). 2. Bhatt N.D., “Engineering Drawing”, 46th Edition, Charotar Publishing House, (2003). REFERENCE BOOKS: 1. Venugopal K., and Prabhu Raja V., “Engineering Graphics”, New Age International (P) Limited, (2008). 2. Gopalakrishnan K.R., “Engineering Drawing” (Vol .I&II), Subhas Publications. (1998). 3. DhananjayA.Jolhe , “Engineering Drawing with an introduction to Auto CAD”, Tata McGraw Hill Publishing Company Limited, (2008). 3 Wednesday, January 6, 2021

4. section of solids real time example Wednesday, January 6, 2021 4

5. section of solids real time example Wednesday, January 6, 2021 5

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7. Wednesday, January 6, 2021 7 Section or Cut surface: The surface obtained by cutting an object by the section plane is called section or cut surface . Section planes: The section planes are assumed to be thin, transparent, perpendicular to one of the reference planes and either parallel or inclined or perpendicular to the other . True shape of section : The true form of the cut surface is called true shape of section . It is obtained by viewing the object normal to the cut surface and projecting it on a plane parallel to the section plane . Section lines: The cut surface of the object is shown by a series of thin, inclined and parallel lines called section lines . This process is called hatching .

8. Hatching of the Sections The surface created by cutting the object by a section plane is called as section . The section is indicated by drawing the hatching lines (section lines) within the sectioned area. The hatching lines are drawn at 45° to the principal outlines or the lines of symmetry of the section The spacing between hatching lines should be uniform and in proportion to the size of the section. HB 2H 2 or 3 mm

9. Types of Cutting Planes : Wednesday, January 6, 2021 10 Y X C P C P C P C P 1 2 3 4 5 Front View Top View 3. Perpendicular HP and Inclined VP 4 .Perpendicular HP and Parallel VP 1 . Perpendicular VP and Inclined HP 2 .Perpendicular VP and Parallel HP 5.Both inclined VP and HP.

10. Types of Cutting Plane (Book Page :252 to254 ) Wednesday, January 6, 2021 11 1 2

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12. Section of Solids for Useful Video: Wednesday, January 6, 2021 13 Animated video for Various Sections of Solids https :// www.youtube.com/watch?v=yS5JfvjXMOM Problem on Hexagonal Prism: https:// www.youtube.com/watch?v=a2AVU8hzAIc Problem on Pentagonal Pyramid: https:// www.youtube.com/watch?v=XJ7d0BHgwcs https://www.youtube.com/watch?v=_ EIfXQPEqp4 Problem on Cylinder : https:// www.youtube.com/watch?v=9Nh5gX6o8DQ Problem on Cone: https:// www.youtube.com/watch?v=37BgijKDlpU

13. Draw a regular Pentagon or a Hexagon. Also applicable to any regular polygon : Wednesday, January 6, 2021 14 https:// www.youtube.com/watch?v=6Ig6PX0ee1M Hexagon Polygon: https:// www.youtube.com/watch?v=uEU5q9sGu6g How to draw hexagon and Pentagon for EG template: https:// www.youtube.com/watch?v=V_YdVMf7FvY

14. 1 .Problem on Pentagonal pyramid(Book page :272) Wednesday, January 6, 2021 15 Pentagonal pyramid of base side 3 0 mm and altitude 6 0 mm rests with its base on HP and with a side of base parallel to VP . Its is cut by a section plane perpendicular to VP and Inclined at 35 to HP and bisecting the axis. Draw the sectional plan of the pyramid and true shape of section. Given : Pentagonal pyramid Base side= 30 mm Height = 6 0 mm one of its base corner on HP Cutting plane: Inclined at 3 5 to HP (H.P ) Bisecting the axis (Height=1/2)=30   Parts of Pyramid Base edges Slant Edges Cutting edges -1 b b b -2 c c c -3 d d d -4 e e e -5 Parts of Pyramid Base edges Slant Edges Cutting edges

15. X Y   60 o   )   2. Sectional Front View 1.Sectional Top View       X )   b c d e 3 a Y 3 . True shape of Section 1 2 3 4 5           25 C P 1 3 5 4 2  

16. 2 .Problem on H exagonal Prism (Book page :270) Wednesday, January 6, 2021 17 Hexagonal Prism of base side 25 mm and axis length 55 mm resting on HP. Two of the vertical faces perpendicular to VP. Its is cut by a plane Inclined at 35 to HP and parallel to VP and passing through a point at a distance 12 mm from the top base. Draw its front view, sectional top View and true shape of section. Given : Hexagonal Prism Base side= 25 mm Axis Length= 55 mm Two of the vertical faces perpendicular to VP. Cutting plane: Inclined at 3 5 to HP (H.P ) Meet the axis distance 12 mm from top.   Parts of Prism Base edges vertical Edges Top edges b b c d e a Parts of Prism Base edges vertical Edges Top edges

17. Y   55 2. Sectional Front View 1.Sectional Top View ( )   (a)   X 12 Y 3 . True shape of Section 1 3 2 5       )   )   25 C P 1 3 5 4 6 X 6 )   (b)   (c)   (d)   (e)     35   2 4 ( )   ( )   ( )   ( )   ( )   Cutting Point 1 b Cutting Point

18. Similar Problem for class work Wednesday, January 6, 2021 19

19. Wednesday, January 6, 2021 20

20. 3 .Problem on Cube (Book page :268) Wednesday, January 6, 2021 21 A Cube of side 35 mm placed and cut by a plane in such away that the true shape of section is a regular hexagon. Draw the front view, top View of the cube and determine the inclination of the plane with the HP. Given : Cube Side= 25 mm To Find: Cutting Plane = ? Inclination of the plane with the HP (H.P)   Parts of cube Base Edges Vertical Edges Top Edges 1 b b c (d) 6 Parts of cube Base Edges Vertical Edges Top Edges

21. Y   3 5 2. Sectional Front View 1.Sectional Top View   (a)   X Y 3 . True shape of Section 1 3 2 5       )   )   35 C P 1 3 5 4 6 X 6 )   (c)   (b)   (d)     2 4 ( )         ( )   Cutting Point 1 b d a Cutting Point 45   45   Result: (H.P)  

22. Similar Problem for Class Work : Wednesday, January 6, 2021 23

23. Wednesday, January 6, 2021 24

24. 4 .Problem on cone (Book Page:271) Wednesday, January 6, 2021 25 A cone of base diameter 4 0 mm and axis length 5 mm is resting on HP . It is cut by a plane inclined at 45 to HP and Perpendicular to VP and is bisecting the axis . Draw the front view and sectional top view and true shape of the section. Given : Cone Base diameter= 4 0 mm Axis Length= 50 mm Cutting plane : Axis is inclined at (H.P) Base inclined = = Bisecting the axis   Parts of cone Base point Apex or vertex Generator o b b c c d d e e f f g g h g Parts of cone Base point Apex or vertex Generator o

25. Y 50 2. Sectional Front View 1.Sectional Top View 25 3 . True shape of Section 40   X Cutting Point 1 b C d g h Cutting Point c a e g h             f b d C 45   P X Y 1 5 2 7 3 4 6 8                 1 8 2 3 4 5 6 7

26. 5.Problem on Cylinder ( Book Page:275) Wednesday, January 6, 2021 27 A cylinder of base 42 mm diameter and axis 55 mm height is resting on the ground on its base. Its is cut by a plane perpendicular to VP and inclined at 35° to H.P and meet the axis at a point 20 mm from the top. Draw the sectional plan and true shape. Given : Cylinder Base Diameter= 42 mm Height = 55 mm Cutting plane: Axis is inclined at (H.P) Meet the axis 20 mm from top.   Parts of cylinder Base sides Generator Top sides b c d e f g h Parts of cylinder Base sides Generator Top sides

27. Y   55 2. Sectional Front View 1.Sectional Top View X 20 Y 3 . True shape of Section     C P 1 3 5 4 X 8 35   2 Cutting Point Cutting Point 42                                 1 2 3 4 5 6 7 8                   7 6

28. 1.Home work Problem Wednesday, January 6, 2021 29

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30. Unit 3: Development of Surface for Useful video Wednesday, January 6, 2021 31 Introduction of Development of Surfaces: https :// www.youtube.com/watch?v=bbcNNxMkcjc&list=PLxyJByp08TUVxQYa8YBV6j7zk6oy54eEm&index=6

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