 It is always a nice idea for me to not to overlap a line, but anyhow and then possibly trace this vertical edge first, trace this edge and then this vertical one, this vertical one here, this one here. I just want to make sure I get the lengths of these right. So, this is about 10 which is kind of ok and this is also about 10 which is kind maybe a little more than 10, but let me not worry about the accuracy in this example. Well, I should be worrying about the accuracy. So, maybe ideally I should be erasing this and I should be redrawing, but again if you notice I have little parallax. So, I cannot see if it is 10 or 11, but that is ok. So, and then of course, these two edges. I hope I get this right and then let me worry about these three edges. Let me move my sketch a little bit on to the right. It probably would not be visible to you, but that is ok. I will get back. These are the lines which are a little difficult to draw, but these are the lines which are a little difficult to draw. It looks like a habit and now for this one, you got overshot by a little while, but that is ok. As I said I have little disadvantage reaching this region of the drawing. Here is my sketch back and here is the picture of the orthographic drawing. So, what I have done is I have covered this edge. I have covered this edge, this one, this part here, this part here. I will worry about these parts a little later. Of course, these three are straight lines and there would be a line which is parallel to the y axis over here. So, let me sketch that first or draw that first, otherwise I will forget. Here I am. I will have to keep flipping. So, maybe I will just fix this part of the edge right again, it will be a little more. So, I will keep flipping these two pictures let and write, because I am going to be accessing different parts of my drawing here. I hope you have a better view of the sketch and the drawing both. So, I have this 70 covered up. I have to worry about this 60 now. I have already gotten the 60 length marked here, looks like. So, let me draw this feature of the object. So, if I look at this length, this is about 30. Maybe I can use the solid pencil directly, because this is a solid line. My edge pencil and draw this directly and perhaps I can even go ahead and draw this line using the edge pencil to make my figure look a little better. So, you know this height is about 50, this height is about 30 and maybe I can go ahead and draw this line directly. I hope I have this looks like I have. So, take care of this, this and this line and at the back well although I have drawn this as if this circle of features going to be letting this part of the object visible. I would not be quite sure, but anyhow well it will be a good idea for me to draw the bounding Ruhambos for this circle. That will give me an idea whether these parts of the object will be visible or not and it will also help me prepare to draw the circle. Of course, the center of the smaller one, the large one they are the same. You know on second thought well I would need to be a little careful when drawing this bounding Ruhambos for the circle, because you know this height which is this height, this height is about 30 millimeters and this height is about 40 millimeters and rather where as this height from here to here it is about 40 millimeters. So, the plane of this Ruhambos will definitely be below the plane of this feature of the object by 10 millimeters and of course, that plane will be 10 millimeters above this plane or this height of the object. So, I need to be a little careful and I need to draw this accurately. Let us now draw the bounding box for this outer circle and the bounding box which is going to be Ruhambos in both cases for the inner circle. I need to be a little careful look at this height, this is about 30, this is about 50 and this height here is about 40. So, this plane where this circle and this circle they lie this plane is midway between this plane and this plane. So, that is the first point I need to keep in mind. The second point I need to keep in mind is look at this center line. This center line is coinciding with this edge in the front view, implying that this distance is something that I have to keep in mind when drawing this center line. So, this corresponding center line will probably be here, but at a distance of 10 below these vertices or this edge. So, having said that let me take my set square away plot 10 down plot 10 down from here and perhaps plot 10 down from here and using my set square I get this line. So, this is where this center line will be. So, let me go ahead and mark that center line using my edge pencil once again long dash short dash long dash short dash long short long and I want to be careful because this horizontal center line will not be at this level, but at 10 below this line. So, switching back my pencil I go 10. Down and then using my set square I make a line along the y axis or parallel to the y axis. Just want to make sure that these lines are really parallel just want to make sure that these lines are really parallel. So, this center is this center here. So, let me make this center line once again long dash short long short long short long I cannot see this line, but looks like I got it right. So, once I have gotten the center all I need to do is to make a rhombus around this. So, what I will do is this rhombus is of side 80 by 80. So, I will mark 40 on both sides of the center along this line and I will use my set square and make sure I have 40 on the other 2 sides along this direction and here and then I will join these 2 vertices where we use a slight thicker or darker line not thicker, but darker line. So, I have got this rhombus and what I will need to do is draw an ellipse touching 4 sides of the rhombus and for that I will be using the 4 center method. Of course, that 4 center method does not give me the exact ellipse, but approximate. So, let me find the 4 centers first. So, I will draw the longest diagonal which is going to be horizontal in this case and then I will take this vertex and join that with the midpoint of this edge of the rhombus right here. And then I will take this vertex join that with this midpoint of the side of the rhombus. So, you realize that now we have 4 centers center 1, center 2, center 3 and center 4. Of course, I can think about using the circles in this tensor here, but it looks like the diameter of this circle will be bigger than the biggest circle I have in my tensor. So, I will probably have to use my compass. So, with this center let me adjust this compass let me see if I touch both these points looks like I do. So, I draw an arc this would be a dark arc with the same center rather with the same radius and with the new center here. So, if my construction is correct I should be able to draw this arc with the same radius. Let me see if I touch both these points maybe I will have to adjust my compass a little bit I have to adjust my compass a little bit and then I draw this arc. It is probably not touching that, but that is for demonstration purposes I can always correct that later. So, looks like there was an error on my part here and then with this big radius with this pointer center and with this big radius. So, make sure I got it right looks like I draw this arc and with this center and with the same radius I draw the final arc let me draw it thicker right and then there is a little bit of touching I would need to do which I would do free hand. So, looks like I have gotten this outer rambles now rather the outer ellipse now let me work with the inner ellipse. So, with the same center now this inner circle is of diameter 40. So, I will have to draw the rambles each of side 40 well I do not think I would need to do much except for the fact that I need to measure 20 on both sides perhaps here and here and using these two points I would just draw dim lines not so dark 20 from here up till here and 20 again from here and then rotate this and get the lines parallel to the x axis slightly darker not very dark all right. So, again we are going to be using the 4 center method I already have the longest diagonal in there. So, this vertex of the rambles and the midpoint of this side of the rambles I join them I join these two vertices once again I get 4 centers and let me mark this these centers. So, center 1, center 2, center 3 and center 4. Now, if I measure this this is about 11 millimeters from here to here and I expect the same for this radius for this arc that I would be drawing in a short while. So, maybe I can cover these arcs through my stencil with a circle of diameter 22. So, let me not worry about the center very much just to ensure that the arc that I am going to draw touches these two edges of the rambles looks like I got this right maybe I will switch my pencil and straight away draw this arc same radius let me make sure that these edges are tangent to the arc that I am going to draw just now looks like it is I go ahead and draw the arc for the bigger arcs I reckon I would need to use my compass with this a center this is radius it is that little let me draw this arc gently maybe I will just give it a touch up and then with this as center same radius I draw this arc requires a little touch up here. So, looks like I have my two rambai and the two ellipses that I needed one of rather one representing a circle of diameter 80 and the second one representing a circle of diameter 40 all right now if I look at this sketch of mine. So, this is going to go in a little bit and this is also going to go in a little bit and of course, there would be a vertical edge corresponding to this. So, let me using light lines extend a line from this vertex I am going to be using the construction line for that. So, two edge pencil well let me have this line extended throughout then let me have the vertical coming down from this part of the cylinder from the circular frame to the cylinder I am going to be using the solid line for that because I know that this would be visible very much and of course, this line will be intersecting the line that I just drew. So, maybe this part would be solid line as well. So, from here let me draw a vertical solid line well let me draw a vertical dim line because this edge is not there, but I do have a reference. So, this point is the corresponding point or the point corresponding to this on this side once I have that let me join these two vertices using the solid edge line which is going to be visible there I go and then let me darken this line. So, notice that my dim lines are not so dim after all because I need to show the construction of these ellipses very clearly otherwise my grader will try to figure how I actually got these ellipses and he will be confused or she will be confused. So, anyhow I got this part done notice that I have made this curve in blue while I made the rest of the sketch in red there is a particular reason for that I will come back to that now just to let you know that this actually is the curve that is the result of the intersection between this cylinder and this slant surface. So, this slant surface and this slant and this curve has nothing to do with the ellipses that I have drawn here. So, will be a separate curve and try to figure how to get this curve this curve may or may not be an ellipse anyhow. So, let us try to focus in this part of the object let me transfer my sketch onto the left and also the figure onto the left and get my drafter here may be I have my figure here for now it is not visible perhaps here because I am going to be working on only this part of the object for now. So, we already got that this was 30 this was 10 this was 10. So, this is 30 10 10 now let me focus on this point of the object this point or this point perhaps and from here up till the center of the sake the sake is also going to be these sets of arcs rather they are also going to be looking like ellipses in the asymmetric view. But for now let me focus on these horizontal lines that I need to draw. So, these horizontal lines they will be parallel to the y axis in my sketch and each of these horizontal lines they will be of length 30. So, I take my friend here the 30 60 set square and start drawing lines along this duration the duration parallel to the y axis in my sketch. Let me shift this slightly and start drawing these 30 degree lines each of length 30. So, if I look at my sketch this line will be visible and these three lines will all be visible. So, I might as well use the H pencil directly and make sure that I draw visible lines. Now this line and this line they are probably be coincident. So, maybe I will go ahead and draw this. Now to draw these three lines each of length 30 come here draw this as 30 go down draw this as 30 and come down further over here and draw this as 30. Let me use my mini drafter the vertical scale of that and see if I got it right. So, looks like I got this part right it will be just a little vertical for my reference. And remember that this length is going to be 10. So, I just measure I told you that I had a little error of 10 10.5 here I measure the same it is pretty much there pretty much right. Now the final thing that I would need to do is to draw these semicircular arcs or in isometric drawing the ellipses or half ellipses corresponding these semicircular arcs. Let me bring my orthographic views back and focus on this outer circular arc this is of diameter 50. So, this rhombus will be of 50 by 50 the center of this rhombus will be along this edge. So, let me draw this. So, this would be the corresponding center for that rhombus and then using my 30 60 friend I am going to plot 25 millimeters on both sides of this edge. So, this is about 25 and of course, this is about 25 let me extend this edge I will go over there this is about 25 and I rotate this come down here complete my rhombus not. So, dark lines were dark enough for us to see how the construction was done. And then of course, we use the 4 center method for that 4 center method to draw the ellipse. So, this longest diagonal is going to be horizontal. So, this longest diagonal is going to be horizontal well let me use my mini draft for this. And let me get the 4 centers joining this vertex of the rhombus to the mid point of that side line parallel to this using that vertex and joining the mid point of this side of the rhombus. And I have the 4 centers as this one this one this one and this one I am going to be interested in only the semicircular part of the ellipse. So, only these 2 arcs they need to be drawn. So, let me measure this this is about 15 looks like I have a circle of diameter 13 my stencil here and perhaps I can use this stencil and get the circular arc here. Make sure it is tangent to both edges looks like there I go and of course, this seems longer. So, I am going to be using my compass for this seems like this rhombus was not accurately made, but not to worry I will just do a little touch up here, but technically I am not supposed to do that, but demonstrations. Now, how about the semicircular arc that would start from here and perhaps go down here back to my sketch this one. So, this would be of the same dimensions as this arc just that it would be 10 millimeters down from each side. Now, I do not have to draw this rhombus all over again I need to be a little smart and what I can do is I already have the centers for this ellipse. So, I can maybe shift these centers down by 10 ups here and perhaps here and maybe shift this point also downward and then I already have the radius set this bigger radius set in my compass may be I can use that draw this ellipse little touch up here and then this was about 15. So, I am going to be using my stencil and may be shift this thing over here or ideally I should be drawing these two edges or I should be shifting these two edges also downward. So, let me do that just to get it right. So, this edge is down and let me also shift this edge down I already have this over here. So, maybe I just draw that. So, with my 30 degree or rather 30 mm it is about 15 all right. So, with my 30 mm circle perhaps I should have drawn this part of the rhombus maybe I will just draw that just to get an idea whether these edges are really tangent to that to the arc. Now, I think I am just about ready. So, this arc would be just up to this point now finally, for this arc. So, we will have to work out a rhombus of side 30 of course, the center for that rhombus would come down over here by 10 mm. So, looks like I already have the edges. So, this dimension is about 15 which is pretty good and this dimension is about 15 also it is about 15 I believe. So, I take my set square my mini drafter extend 15 here and 15 here down and I believe I have 15 here and perhaps 15 there I rotate that get another rhombus this time of side 30 mm. Let me double check of course, this is the center is about 15 and 15 all right this should be about 30 yeah this should be about 30 all right this should be about 30. So, I will probably need to extend this by a little bit and then extend this edge and get the fourth vertex of the rhombus. So, this is my rhombus where I need to draw the semicircular arc of diameter 30 once again the fourth center method get the longest diagonal this could be a mess or I will try to be a little careful. So, I am focusing on this rhombus now. So, the midpoint of this edge is somewhere here extend this edge and the midpoint of this edge is over here. So, I join this vertex of the rhombus. So, this is the final thing I join this midpoint of the edge with this vertex and this one with this get four centers first one second one I just need these two to get this part of the semicircle. So, I measure this this is about 9 pretty much. So, get back to my stencil switch to my edge pencil quickly use a circle about diameter 18 make sure that it touches both edges this tangent to both edges and quickly draw this arc. And I measure this length this is about 25 again I need to use my compass for that. So, I get my compass draw this circle arc perhaps little darker a little bit of touch up and perhaps I will see this edge. So, may be I will erase this for now I must admit that this is not the first time I have used the eraser, but still to make sure I am accurate these two vertices they will be joined together. And it looks like I am finally finished except for the fact that I still do not have this arc let me scratch my head think about that and get back to you. So, this is what we have as of now. So, looking at the orthographic views in third angle projection that we have. So, we covered this circular feature we covered the internal void and then we covered this slant surface and then we covered this slant surface here. And then we covered the features over here. So, looks like we are done pretty much except for the fact that we still have not been or rather we still have not addressed the curve of intersection between this cylindrical feature and the slant surface. So, this was the blue curve on my sketch this one here. So, what I did was I took a long break I folded my sketch placed it in my pocket came out and start thinking as to how I would be getting this curve. And it looks like may be if I focus on this region of the orthographic projection may be there is chance that I might be able to find the points of intersection between this slant surface and this arc of the cylinder. In fact, this curve is nothing, but a set of points of intersections between these two surfaces. So, let us try to find that out, but before we do that let me put these sketch and the figure away for a while. Well, let me get this figure back may be place it here look at this distance how much is this how much is this distance this is about 20 do I have 20 here probably not. So, what I will do is I will mark this distance and may be coming back to my sketch extend this line. So, that this distance is 20 and then I will start worrying about the points of intersection between the cylinder and the slant surface. I get back to my friend the 30 60 square mark this as 20 and then extend this line make this as a solid line this is pretty much what I have here and then before I start with the intersection points. Let me draw the magnified view of the orthographic view pertaining to this part of the solid. So, let me have my sketch here and let me first draw this trapeze maybe somewhere over here or may be a little on the side just to make sure that this figure does not interfere with this figure. So, this distance is 60 I am using my 2 H pencil. So, I draw horizontal of 60 this height is 40 this height is 30. So, what I will do is I will draw 30 from here whereas, this height is 50. So, I get 50 here and then I will join these 2 points using my drafter project these vertical edges upward. So, I am only interested in the intersection points in this region. So, in the orthographic view I will just be drawing this part of this lender notice that the center is just above this vertical edge which is this edge here. So, the radius of this is 40. So, I will make sure I have enough clearance which I do. So, maybe I will mark this here I will get the center line let me also get the bounding square that bounds this outer circle well actually it would not be a square, but it will be half a square this is about 40. So, I just draw this horizontal line and then using this as center let me also draw the center line over here using this as center. So, with this as radius let me draw an arc I should have drawn it lighter because it is a construction arc, but that is ok. Now, notice that this is 60 here and this is 40. So, there was going to be a gap of 20 in between these 2 which is what this is gap of 20 just about 20 and then I project this part downwards. Now, the points of intersection are going to be in this region how do I get them well they have to be lined in top view they have to be lined on the circumference of the circle and in the front view they have to be lined on this slant surface. So, that is something that we need to keep in mind once again the points of intersection in top view will be here on this arc and the front view they have to be lying on this slant surface. So, what I do is I draw horizontal from here extended and then I partition it into let us say 4 parts and then I take these projections upward. Now, corresponding to this horizontal line let me draw a line here. So, this is of length 40 and of course, this line in the isometric view or drawing is going to be along the direction of the y axis as going to start from here. So, let me start from this point measure 40 and then draw a little construction line right there. Now, these points these 5 points are going to be lying on this line. So, let me mark these lines or these points rather. So, once I have these points marked you know if I look here at the front view these distances are nothing, but the vertical distances from these points that is something that I need to keep in mind. So, at this point the vertical distance is 0 at this point the vertical distances something here and the vertical distances they will use as I go from here to here. So, may be it will be a nice idea for me to measure these distances and mark them on this picture here on this diagram on this figure. So, this would be about 12. So, I go over here and mark 12 from here this is about 10 just about. So, I mark 10 here this is about close to 7. So, from here I mark 7 here this is about 3 millimeters. So, I mark 3 millimeters and then this is 0 this is 0. Now, how about these distances? Now, these distances would correspond to the distances of assuming this line to have been projected up there and then these distance rather these distances would be from here up to the point of the circle let us try to measure them. So, if I go here this distance is 0 if I go here this is about 2 millimeters. So, I will have to measure 2 millimeters from here. So, will be a nice idea for me to draw lines parallel to the x axis from each of these. Now, I know that this distance is just about this distance there would be some error over here well I do not need to worry about that because I know the point of the sections will be here and corresponding this the point of the section will be here. Now, if I measure this this is about 2 millimeters. So, this thing should be about 2 millimeters. So, I take my set square measure 2 from here. So, I get the first point of the section this height is close to 5 again this is not accurate close to 5 5.5 perhaps. So, I will mark 5.5 here and then this is about 15 I will possibly mark 15 from here it is about 14. So, I will probably have to shift 1 point back may be very close to the circle. So, I have got this point as 1 point of the section this is the second this is the third this probably the fourth and this right over here as the fifth point of the section. So, once I have the point of the section I would just draw them or join them using say a French curve. So, this may not be very accurate, but this is close to what we might expect to get. So, I have to get up and come to the other side of the table to get my French curve right not quite. So, this point is kind of a little off, but I can perhaps take care of the other points and get this curve in the section. Let me see if I got this right getting back to my figure here. So, I got these points right this would be 0 of course and this would be 0 over here sorry and this is close to about 3 would be close to about 3 perhaps this would be close to about 6 perhaps 6 and this would be about 9 or 10. So, this should have been yeah just about 9 or 10. So, in a way I think it is just to get the idea. So, these distances would be these distances and these distances in the top view would be these distances. So, this is what the idea is and having said that I think I may have covered pretty much everything that I have on my sketch and therefore, the isometric view of this solid the orthographic third angle projections of which are given pretty much looks like what we have on our sheet right here. Thank you for joining me.