Sections of Solids

Chapter - 15

Sections of Solids

At the end of this chapter we will be able to :

1. Understand the importance of sectional views.

2. Describe the different types of cutting planes.

3. Describe the method of drawing sectional views.

4. Differentiate true shape and apparent shape of sections.

5. Draw the sectional views of simple solids (cube, prism, pyramid, cylinder, cone and sphere) cut by different types of cutting planes.

INTRODUCTION:

Orthographic projections of an object is drawn to understand the position and dimensions clearly. But it was observed that the orthographic projections may contain a number of dotted lines which represent the presence of hidden details lies behind or somewhere in the middle of the object. With the increasing number of such types of hidden edges ie., dotted lines, it becomes difficult to intreprete the object thoroughly. Hence it is necessary to show the internal details of an object. The internal details of an object can be made visible by cutting the object using an imaginary plane and removing the portion of the object which is in between the imaginary plane and the observer.

The method of cutting and obtaining sectional views of simple solid figures, Prism, Pyramid, Cylinder, Cone and Spheres are presented in this chapter.