 Hello, friends, myself, Sanjay Mutt, assistant professor from Mechanical Engineering Department of Vulture Institute of Technology, Solapur. Today I am explaining regarding the how to draw the orthopic projection, that is introduction part of the orthopic projection. The learning outcome for this topic is student will able to discuss the basics of orthopic projections. In orthopic projections, here you have to whatever the three dimensional view or object placed in front of you, you have to convert it into two dimensions. When you have to convert it into two dimensions, you have to draw the front view, top view and side view. I am explaining later one. Secondly, it is a form of a parallel projection in which all the projections lines are orthogonal to the projection plane. The pioneer of this orthopic projection is Gaspard-Boneject. Now, I am showing this three dimensional colored view, colored, so here you are observer and here is object and here is the screen, a parallel vertical plane, which is front of you, which is parallel to your eye side, this vertical plane. And in between vertical plane and the observer, the object is placed in between them. When the ray starts from your eye side, when it gets collides with that object, whatever the shadow, you get it on that plane that is called as a view. So here you get a shadow on that vertical plane, on that projection of plane, that is the plane of projections and this colored one that is a shadow, this is called as a view. Imagine that, suppose this plane is obscene, object is here and you are observer and the ray starts from your eye side, it get collides with that object, you will not get that image. So to get that image, you have to take a imaginary plane, a vertical plane. Same thing, one more plane you have to take it, this plane is parallel to your eye side. And one more plane you have to take it, which is perpendicular to your eye side, that is called as a horizontal plane. So that I will show you. So this is a vertical plane, just I am explaining, which is parallel to your eye side. Another plane is there that is called as a horizontal plane, this is a parallel to the HRP, parallel to the ground, parallel to, sorry, perpendicular to your eye side. So this is a vertical plane and this horizontal plane. One more plane is there that is called as a side or a profile plane. When these planes are, there is a vertical plane, this one and this is a horizontal plane. When they get collides with each other, you get as a four quadrant, that is the first quadrant, second quadrant, third quadrant and fourth quadrant. So when you have to draw the orthopic projections, there are two angle projections are there. What is the two angle projections method? The first one is a first angle projection method and another one is a third angle projections method. What is the first angle projection method? Imagine that whatever the four quadrants you had to get it, when the intersection of the vertical plane and horizontal plane, you get as a four quadrant, in that four quadrant, this is the first quadrant, in that first quadrant, imagine that the object is to be placed in that first quadrant, whatever the shadow you get it, that is on the vertical plane and horizontal plane, that is called as the first angle projection method. What is the third angle projections method? Here I am showing the four cotton unit, first angle, first cotton, second cotton, third cotton and fourth cotton. This object is replaced in the third cotton whatever the images you get it that is called as a third angle projections method. Now I am explaining the first angle projections method. In the first angle projections method whatever the images you get it I am showing this colored one ok. Here is the front view. So, here is the observer. When you have to see that object whatever the images you get it that is the red color one and the bluish dark blue color is to be there that is the front one that is called as the front view and now you have to here is the observer you have to imagine that you have to rotate it through a 90 degree. You have to see that object from the top view from here from the top view. You have to rotate it yourself through 90 degree and you have to see that object from the top view whatever the images you get it that I am showing below the reference line that is it is greenish one and this yellow blue color one is to be there that is called as a top view. And one more view I am showing here is the observer then one more view I am showing here when you to go to the right hand side view. Here is the observer I am seeing that object from the side view. When you to see that object whatever the planes are parallel to that is a yellow color one again the green color one so it is a side view. Here I am showing that in the first angle projections method here is a reference plane the front view is above the reference line and the top view is below the reference line and the side view whatever the side view I am showing here right side view I am drawing in the left hand side. Now you go from shift to the third angle projections method. In the third angle projections method you have to assume that the object is placed in the third quadrant and this colored views I am showing here. Here is the observer when you to see that observer from in this direction whatever the images you get it that I am showing in the front view. But the basic difference between the first angle projections method and the third angle projection method is the first angle position method object is placed in the third quadrant. So that's why this front view I am showing above the reference line and top view below the reference line. But here the third angle projections method the object is placed in the third quadrant. So that's why front view is below the reference line and the top view is above the reference line. So that is the basic difference between the first angle projections method and the third angle projection method. Now I am showing some lines here you have to draw it the visible lines which is a dark one hidden lines are there that is a rotated one center line one lot is to be there in these are arrows to ends that is the dimensions lines and construction there is a fair one. These I am showing here you take example for this one in the direction of arrow I this is the object and you are observer here when it to see that object you get as a plane rectangle as it is this rectangle as it is. But these edges are there they are invisible from the front view. So that's why you have to show the dotted line. So this construction line you have to hidden lines are there on the same thing when it to same object here the observer and you see that object there are you get a three rectangle the first rectangle second rectangle and the third rectangle because these edges are visible for you. So that is the basic difference between these two objects. Now I am taking a simple example for this one here I am drawing the reference lines and in the direction of arrow I am seeing that of that is the front view when I to see the front view this what you call blue color dark blue color plane as it is and the red color is as it is. So it is a two planes. So what about the this brownish color you know is there think all that what about this plane the answer for this one is to be whenever we see that object in the front view this plane this brownish color plane is perpendicular to your eyesight. When the plane or a line is perpendicular to eyesight you get as a line age view for this plane it is a age view. Now I am going for a rotating through a 90 degree and see that same object from the top. When you see from the object from the top view which planes are parallel this yellow color one is there and this brownish color one is to be there. Okay this yellow color and brownish color I am drawing then what about this red color think all that what about that plane where how you have to represent it just I am explaining previous one in the front so what I am saying in the last previous one when you have to draw the front view when any plane just like now this red color plane is to be there and when you have to see that object here you have to see that object when the red color is to be there this plane is perpendicular to eyesight. So the plane is act as a line or age view that age we are showing here. Okay now I am going for the side view here is the observer I am going for the side view how to draw the side view draw the 45 degree line draw the respective generators vertical generators and horizontal generators and through 45 degree rotated it and when you have to see that object whatever the planes are parallel to you you have to draw it then what about the brownish color here. Again you have to think all that how you to draw it. Yes exactly in the previous one I am showing this brownish color as a age view in the top view this red color plane as a age view now again when I have to go for the side view this brownish color plane is a age view. Okay so this is a simple orthopedic position it is called as a front view it is called as a top view and it is a left hand side view for this I am taking the reference of NPTEL okay thank you.