Problem-6
A cone of base 80 mm diameter and height 100 mm lies with one of its generators on HP and the axis appears to be inclined to VP at an angle of 400 in the top view. Draw its top and front views.
Solution:
Figure 6 illustrates the procedure for obtaining the projections of the cone. Three steps are involved. In step-1, the Top view and Front View of the cone is drawn in the simple position. The base circle is divided in to 12 equal parts. These points ate joined with the apex to obtain the respective generators. Instep 2, the cone is tilted such that the cone lies on one of its generator in the HP. i.e. the generator g’o’ is made to coincide with the XY line. The top view of the object in this condition is drawn by drawing projectors. In step-3, the cone is titled such that in the top view the axis is inclined at 400 to the XY line. The front view of the object is obtained by projection technique.
Figure 6. The projections of the cone of problem-6.