 Hello, friend, myself, Sanjay Murt, a student professor from Walchand Institute of Technology, Solapur. So, today I am going to explain how to draw the orthopedic projections. The outcome, the learning outcome for this topic is student will able to draw orthopedic projection of a simple object. Now, I am taking as this simple object here, I am showing the arrow X. In the direction of arrow X, you have to draw the front view. When you to draw the front view, when you to draw the top view, when you to draw the side view, you have to calculate the measurements, maximum dimensions are there. And second thing, that line or a plane which is parallel to you, you have to draw as it is or a true shape, true length is to be there. So, when you to draw in the direction, when you to draw the front view in the direction of X, you have to calculate the maximum dimensions, 3.25. So, I am drawing the 3.25 here. Then the gap is there, because it is a guide way, sliding guide way is there, that guiding guide way is how much it is, total length is 3.25 and this gap is 2.25, means 10 mm gap is there, 5 mm from left and 5 mm from right side. So, 5 mm from the left side and 5 mm from the right side, I am drawing it. Then the vertical height is given, total height is 2.23 and the vertical height is given as 0.88. So, I am drawing the 0.88 and the 0.88. Then the socket is there, how much the socket total socket is given as 2 mm. So, and this total where the stars are where it ends, that gap is 1.5 from the center line. So, from that center line, you have to draw both the edges and vertical height is 0.2 mm and 0.2 mm I am extending. Join with both ends, this socket, then vertical this lab is there, how much maximum dimensions is already given. So, extend that line, complete the projections. Now, how to draw this guide way is there, the guide way angle is given as 20 degree, here 20 degree and here 20 degree and the center line, this edge, this gap is 2.25, means from that center line, you have to travel divided by 2, travel half on left and half on the right side, that is 2.25, means 1.125 and how much gap is there, it is given as here, 0.25. So, vertically you have to travel, it is 0.25 and 0.5 and 3.5, that is 7 and join this line, 20 degree. So, this portion is to be completed, which portion you have to complete it, in this direction of arrow x, which planes are parallel, means I am shaded, this red color shaded is to be there, it is to be, you have to drawn as it is, because it is parallel to front view. Now, one more that topic remaining here, one more lines are there, think over that, this hidden lines means this square hole is to be there for this lab, for this block, it is a square hole. In the front view, in the direction of x, it is hidden one, it is invisible one. So, how to draw it, think over that. So, if it is invisible one, you have to draw it is, what is the concept, when that any line or a plane or edge, when it is invisible one, you have to draw with a dotted one. Then, where on this vertical upper portion is to be there, that is to be dotted one. So, when you have to go for the front view, draw this dotted line. So, this point is exactly behind of this one and this point is exactly behind of this one. So, how much this gap is there, it is given as, it is given square symbol of square hole 0.75 center on 1.25 and 1.22 and 1.22. So, take a center of this one, that is 1.12, 0.6, draw the center line from vertically 2 mm and horizontally 2 mm. So, draw this offset as a dotted one because it is invisible one. So, invisible portion is, you have to show it a dotted one. So, this is all about the front view. So, when you know the front view, then you go for a top view. When you have to see from the top view in this direction, this portion is to be there. Already length is to be here to given here, from the top view, this length is there and this width, how much this width 1.22. So, first for that we have to draw some center line for that, means it is easy or convenient for that to draw the other views are there, other lines are there. So, for that you have to draw center line, when you have to draw the front view, when you have to draw the side view, you have to draw the center line, it is given as 1.22. So, travel, when you have to see from the top view, this portion is to be there, which one, this shaded one, which is parallel, you have to draw as it is because it is a parallel. Now, this portion is to be over, now again think over that, again some part is invisible one, which part is invisible, this guide way, two edges are there, this one edge and this edge, this edge and this edge, it is invisible, where it is in the top view, in the front view you have to already draw it and where that guide view from start to end one. But when you see from the top view, it is invisible one, so that invisible portions you have to draw, shown by dotted line, invisible portions you have to show by dotted lines. So, what about the square hole, again same for this one, again the square hole is invisible from the top end. So, take that how much distance and it is shown by dotted one, from where, from start to end one. How much that width is to be there, it is given as 0.75, with 1.22, on both sides where to travel that much distance, draw it is dotted one, because when you have to see from the top view, this square hole is invisible one. So, invisible portions you have to draw with a dotted one, for this square, because this portion is exactly behind of this one, this corner is exactly behind of this one. So, only two edges you have to invisible, there are four corners are there, but these two corners, this base one, they have to be exactly behind of that. So, that is why you have to draw with a dotted one, so this is the front view and this is the top view. The orthopedic projection from the given isometric view and you yourself from this front view, from this top view, you have to draw the what you called side view. For the side view again, you have to rotate this things, projections are there, 45 degree line and draw the side view.