 Hi everyone, myself is C.L. Rathod, Aston Professor, Department of Mechanical Engineering, Walsh and Yusselt Technology, Swalapur. Today's topic is orthographic projections of simple object, learning outcomes. At the end of this session, student will be able to draw the orthographic projections of simple object. So this is the simple object which I have selected. So this is the front view and this is the top view we are going to see. And so when we see from the front, so this portion we are going to see and length is given, here length is equal to, length is equal to 30, length is given that is 22 plus 82 plus 22, that is equal to 126 mm and height h is equal to given that is 30 plus 50 plus 25, that is equal to 105 and width is given is 75. So I am going to take this height, length and width and when we see from the front, so I am going to see from this side and at that time we are going to see this block and this cylinder and we are not going to see this hole, this hole and this hole. So first what I have to do, I have to take 126 is the length. So I am going to take 126 is the length, 126 and 25 is the block from this, I have to take 25 from this, I have to take 25. So similarly here I have to take 25 and I am going to complete this block, 126 by 25. Then I am going to divide this is 126 divided by 2, so half of this one is 63, I am going to take 63 here and I am going to make the axis line over here and so when we see from that front we are going to see this cylinder, so its height is 30. So I am going to take 30 from this and 75 mm diameter is given, so I have to take 35 on both, 37.5, 37.5 both side and I will complete this block of 30, so this is 30 mm. So in some cases we have to shift this axis line, so there is no relation between this gap and this block. So for that I am going to shift little below this xy line, so this is yx. So now what I have to do, I have to take this slot, so its length is given 22, I am going to measure 22 this side and also 22 this side and height is given, from this I have to take 50, so this is 50 and another 25 I have to take from this, so this is 25. Then I am going to draw this block of 22 on both side. So this is the 40 block, 22 by 22 blocks, then I have to complete this, so similarly here I have to draw this block and so this is how we are going to draw the front view for these two slots and when we see from the top we are not going to see this hole, so its diameter is 40. So I am going to take 20 mm each side and through hole is given, so for that I have to draw this dotted line. Then so when we see from the top, so front we are not going to see this hole also, so from this 50 I am going to make one axis line, so this is the axis line from at 50 mm, then so we are not going to see this hole, so its diameter is 20 mm is given, so what I have to do I have to take 10 mm each side and I will complete this dotted line over here and now so this is how we are going to draw the front view and now what I have to do, I have to project all this line, this is the line I have to project, this is the dot, this is the line, this is the axis line and this is also I have to draw and this I have to draw the another axis line. Now I have to take 75 from this, so this is 75, I am going to prepare the block of 75 by 126 here, so this is the block of 126 by 75, now when we see from the top you can pause the video and see this hole, so whether when we see from the top whether it is going to visible or not, I hope you will going to understood this, so when we see from the top you will not going to see this hole both the holes, so what I have to do, I have to draw this dotted line over here and when we see from the top we will going to see this slot also, so we will going to see this complete slot and this slot as well and when we see from the top we will going to see this hole, so for that what I have to do I have to draw the complete hole, so before that what I have to do I have to divide this 75 is half it means 37.5, 37.5 each side I will going to take and I will going to draw the axis line over here, then what I have to do I have to draw this hole of diameter 40, so I will draw the complete diagram, when we see from the top we will going to see the 40 mm diameter hole, when we see from the top we will not going to see this cylinder, so for that what I have to do I have to take this length and I will going to draw the dotted line because it will not going to visible from the top, so this is how we will going to draw, so now, so next when we see from the top this hole is not going to visible, so we will going to take from top we will going to take 10 mm each side, so I will going to take 10 mm here also and 10 mm this side and we will going to complete the dotted line over here and now, so this is how we will going to draw the front view and top view, now I will going to dimension this, so this is the 75 diameter is given, so this is 126 length and from this it is the 25 mm is given and from this to this 50 mm is given and from this it is given 20, 25 is the 25 mm is given and then this hole diameter is given that is 520 mm and this hole diameter is given 40, so I have to mention here that is 540 mm is given and this length is given that is 75 mm, so this is how we will going to draw the top view and front view of this simple object.