Engineering Graphics

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. Recall that in our last class, we had learnt about Square Headed bolt  kept with its axis parallel to both the HP and the VP.    Let us now proceed further and learn about  Square Headed Bolt  in the vertical position and its orthographic views. Square Headed Bolt It is another commonly used bolt. The head of the bolt is in the shape of a square prism (or slab). The outer part of the head of the bolt is chamfered at 30 degrees just like the nut. Refer to Fig 1 below. The square bolt comprises of the following lengths just like a hexagonal headed bolt. Fig 1: A square headed bolt a.  Shank length  = The Shank length is the total length of the cylindrical part of the bolt excluding the thickness of the height of the head. It is the sum of the threaded length and the unthreaded length. b.  Threaded length  = It is the le

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. We will learn about Orthographic projection in today's class. Orthographic Projection The word  Orthographic  consists of two words ' Ortho ' and ' Graphic '. ' Ortho ' means ' right angles ' and ' graphic ' means  drawing . Therefore, orthographic projection is a drawing in which the line of sight falls perpendicularly on the  Planes of projection . Projectors The lines of sight or rays that fall go past the object and falling on the so called 'screens'. Projection Projection is the representation of the shape (something similar to the shadow) of the object on a plane (or the screen). If straight lines are drawn from various pointson the contour of the object to meet the plane (screen) the figure so obtained on the plane id called as the projection of he object. Planes of P

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. Recall that in our last few classes, we have learnt about the following machine parts: 1. Hexagonal Nut 2. Square Nut 3. Hexagonal Headed Bolt and 4. Square Headed Bolt. We have drawn the orthographic projections of their Front View, Top View and Side Views (LH and RH). These being the practical periods, lets us draw the following 4 projections. Exercise - Practical Q 1. Draw to scale 1:1, the Front View, Top View and the LH Side View of a H exagonal Nut , M30 kept on the HP with its axis vertical and three of its faces visible in the front view. Q 2. Draw to scale 1:1, the  elevation  (Front View), the  plan  (top view) of a Square Nut , M40 keeping its axis vertical and a diagonal parallel to the VP. Q 3. Draw to scale 1:1, the Front View and Top View of a  Hexagonal Headed Bolt,  M40 keeping its axis vertical. Q

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. We will learn about Orthographic projection in today's class. Orthographic Projection The word  Orthographic  consists of two words ' Ortho ' and ' Graphic '. ' Ortho ' means ' right angles ' and ' graphic ' means  drawing . Therefore, orthographic projection is a drawing in which the line of sight falls perpendicularly on the  Planes of projection . Projectors The lines of sight or rays that fall go past the object and falling on the so called 'screens'. Projection Projection is the representation of the shape (something similar to the shadow) of the object on a plane (or the screen). If straight lines are drawn from various pointson the contour of the object to meet the plane (screen) the figure so obtained on the plane id called as the projection of he object. Planes of P

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. Recall that in our last class, we had learnt about Hexagonal Headed bolt and its   projections.  Let us now proceed further and learn about Square Headed Bolt  and its orthographic views. Square Headed Bolt It is another commonly used bolt. The head of the bolt is in the shape of a square prism (or slab). The outer part of the head of the bolt is chamfered at 30 degrees just like the nut. Refer to Fig 1 below. The square bolt comprises of the following lengths just like a hexagonal headed bolt. Fig 1: A square headed bolt a.  Shank length  = The Shank length is the total length of the cylindrical part of the bolt excluding the thickness of the height of the head. It is the sum of the threaded length and the unthreaded length. b.  Threaded length  = It is the length of the bolt on which threads are available. c.  Th

Dear Students, Greetings and a warm welcome to all of you. Attention Please: Important Instructions You need to write your names in the comment section at the end of this blog as a mark of your attendance. You can use the same section to ask any doubts that ou may have. I will also be posting my instructions to you in that very section. Hence, keep checking the bottom of this blog at regular intervals -------------------------------------------------------------------------------------------------------- The theme of the day is 'Humility'. You must have heard the phrase 'Humility wins the race '. The phrase means that a person who is humble and gentle is sure to reap success in life. Humility means humble or modesty while its opposite is arrogance . We all know that arrogance is an undersirable quality that no one likes. Let me ask you, would you be happy to meet an arrogant and a haughty person? Clearly, your answer will be, No.  Just imagine, if you

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. We will learn about Orthographic projection in today's class. Orthographic Projection The word Orthographic consists of two words ' Ortho ' and ' Graphic '. ' Ortho ' means ' right angles ' and ' graphic ' means drawing . Therefore, orthographic projection is a drawing in which the lne of sight falls perpendicularly on the Planes of projection . Projectors The lines of sight or rays that fall go past the object and falling on the so called 'screens'. Projection Projection is the representation of the shape (something similar to the shadow) of the object on a plane (or the screen). If straight lines are drawn from various pointson the contour of the object to meet the plane (screen) the figure so obtained on the plane id called as the projection of he object.  Planes of

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. Recall that in our last class, we had learnt about  square nut and its   projections.  Let us now proceed further and learn about  Hexagonal Headed Bolt  and its orthographic views. HEXAGONAL HEADED BOLT It is the most commonly used bolt. The head of the bolt is in the shape of a hexagon prism (or slab). The outer part of the head of the bolt is chamfered at 30 degrees just like the nut. Refer to Fig 1 below. The Bolt comprises of the following lengths a.  Shank length  = The length 'L' as illustrated in the below figure. b.  Threaded length  = The length 'X' as illustrated in the below figure c.  The thickness of the head  = 0.8 d Orthographic Views of the Hexagonal Headed Bolt 1. For the purpose of constructing the orthographic views of the bolt, we place the bolt on the HP in a way that its axis is p

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. We will continue with more problems on  plane geometry in today's class . Exercise - Plane Geometry - 8 Q 27. Make angles of 108, 72 and 36 degrees. Q 28. Make angles of 54, 27, 18 and 9 degrees Zoom Please

Dear Students, Good Morning and a warm welcome to today's class. It feels really nice to meet up for yet another class this morning. Recall that in our last class, we had learnt about square nut and its   projections.  Let us now proceed further and learn about Hexagonal Headed Bolt  and its orthographic views. HEXAGONAL HEADED BOLT It is the most commonly used bolt. The head of the bolt is in the shape of a hexagon prism (or slab). The outer part of the head of the bolt is chamfered at 30 degrees just like the nut. Refer to Fig 1 below. The Bolt comprises of the following lengths a. Shank length = The length 'L' as illustrated in the below figure. b. Threaded length = The length 'X' as illustrated in the below figure c. The thickness of the head = 0.8 d Orthographic Views of the Hexagonal Headed Bolt 1. For the purpose of constructing the orthographic views of the bolt, we place the bolt on the HP in a way that its axis is parall