 Myself, SM Mert, Assistant Professor from Walsh and Isdwap Technology, Sholapur. Today I am going to engage the sectional view of orthopedic projections. So, regularly in the previous video you have to know that orthopedic projection that is front view, top view and side view. So, today I am going to explain one step ahead that is sectional view of this orthopedic projections. The learning outcome of this video is students will able to draw the orthopedic projections of sectional view of the simple objects. This is a simple object three-dimensional will be placed in front of you and we have to draw the sectional front view. Only one view is to be there. Detail we have to study all this how to draw the sectional view and all these things. So, first of all you have to calculate the maximum dimensions what is the length and what is the height. And you have to in that length and height you make on square block for that and in that block you have to place this object. So, when I have to calculate the distances from this end it is a 12 mm. This ends to the centerline 95 12 plus 95 that is 107 up to the center and the radius for this one is R 25. So, 107 plus 25 that is 132. So, draw a length of this one that is 132 and the height for this one that is it is this gap is 15 mm 15 plus the centerline is 60. That is 75 mm 75 15 plus say centerline 60 75 75 plus 25 that is 100 mm. So, height is 60 plus 15 75 75 plus 25 100 mm. So, make a square block of this one 132 by 100 mm. Now, we have to start with the front view sectional front view in the direction of X. So, in this direction you have to draw the sectional front view and the section line is to be given here that is given as a section AA. It is moving in this direction this is a section line etching line. So, when this portion is to be removed that whatever the remain portion is to be there this portion you have to remove it. Whatever the remain portion you have to draw the section line. In the previous video we have to taking the section of a object along with that rib rib is not a part of that object. So, here the rib is not there. So, whatever the complete object you have to cut it the other portion which is hidden portion is there which is in keep in front of you. So, when you have to draw the sectional front view first you have to draw the front view what is the front view this portion you have to remove it this portion. So, when you have to remove this portion is to be there the backside portion come to the front end and that you have to show it. So, start with this point this gap is given it is a 12 mm it is given here this distance and this distance 12 mm from this end you have to draw travel horizontal to the 12 mm. Then vertically gap is to be given that is a 15 mm gap is to be there 10 plus 5 15 mm and it ends up to here ok. Then here is this part is to be removed and this part come in front of you that is a semicircular part. For that portion you have to fix the center line for that what is the radius for that radius is given as a R 25 radius is 25 from that. So, from this end you have to travel 25 horizontally and you have to travel downward 25 to fix the center line for that is a 25 and downward you have to travel 25. So, it is a center for that. So, this semicircular you have to see as it is it is because it is this shape is parallel to you parallel to that object ok. This semicircular is to be there up to here and one more hole is to be there at the center this hole and the hole diameter is given as a 5 25. And it is parallel to you the shape is as it is 10 5 25 means radius is 12.5 mm this circle is to be there. Now, this slant edge it ends somewhere here and the end from this end it is a 45 mm and the vertical height for this one it is given as a 30 mm it is given. So, travel 30 mm vertically and horizontally you have to travel 45 mm 10 20 30 40 45 up to here and this slant edge is to be here this inclined for that this inclined portion is to be there. So, this portion you have to see as it is ok this portion which it came in front of you. So, when you have to see in this object there are two holes are there it is given that two holes of 5 15 and they are invisible one. One more thing is there when you have to see in this object this edge is invisible, but that when you have to cut that portion this portion comes to in front of you. So, it is seen as a edge one. So, this portion when you have to cut that portion this semicircular part when you have to see regular front view this lines as a hidden one you have to show a bad dotted line. But when that you have to cut that object a sectional line is passing through that circle that what you call that portion come to in front of you and you have to get as a circular portion seen as a rectangle. So, first you have to fix the center of both one the center is to be given it is to be given that 30 mm from this side. So, first fix the center line of this one that is a 30 mm and another center line which is given as 50 mm from the center line. So, when you have to take a cut the portion this surface come in front of you which is already when you have to go for the front view it is a hidden one when you have to take a section for that it comes to the surfaces. So, you take as a edge as a line as a surface and watch how much that edge line is a this is the 2 holes of 550 means right and left radius is equal to 7.5 mm. So, fix the position of the surfaces go for a right one let 5 plus 7.5 5 plus 7.5 5 6 7 7.5 5 6 7 7.5. So, this line seen as a dark one continuous one because it is a surface because you have to cut that portion this portion that front portion is to be removed. So, when you have to take a section for that that surface come to you and only the hatch row portion is to be given here that is a cut portion is to be there. So, this hatch row portion means this is a cut portion is to be there section you have to taken for that and that for surface is come to in front of you after the section line. So, why do you have to go for a section of this line some surfaces some lines some edges they are hidden one they are come to in front of you. So, pause the video think over that what is the edge for this one how to see it when this portion is to be removed. So, think over that. So, when you have to remove this portion this surface come to you and you seen as a line one. So, this is a section of a given surface that is a section of a given surfaces and this portion it is a tangent one actually it is to be here. When we have to draw the tangent line you have to remove this line this line and you have to draw up to that tangent line this portion is to be there. So, you have to given the edges or the distance that is a 30 mm and this center to center line this distance is given as 50 and this 30 mm it is given that is a 30 that is 50 and this center to center line it is given as 60 and this portion is 15 mm and the radius for this one it is R 25 and given and it is a R 12.5. So, this is all about the section of this. So, for this video I am taking the references from Engineering Graphics 1 by Professor M.L. Davade. Vision publications.