# Projections of Solids

Introduction

Any object having definite length, width and height is called a solid. In engineering drawing, solids

are often represented by two or more orthographic views, i.e., FV, TV or SV. The study of the

projections of a solid is very important in mechanical-design problems. The knowledge of

projections of solids is essential in 3D modeling and animation. Projections of solids find wide

applications in the construction industry.

Basic Solids

Basic solids are those which have predefined shapes. The basic solids are the constituent parts of

any complex solid. Objects in the real world are made up of combinations of basic solids. In 3D

modeling, the basic solids are called solid primitives. Solid primitives are combined in logical

ways to obtain the desired 3D shape.

System of Notation

1)     The actual plane in space is denoted by capital letters A, B, C and D etc.

2)     The front view (FV) of a plane is denoted by their corresponding lower-case letters with dashes

as a’, b’, c’ and d’ etc.

3)     The top view (TV) of a plane is denoted by their corresponding lower-case letters without

dashes as a, b, c and d etc.

4)     The side view (SV) of a plane are denoted by their corresponding lower-case letters with

double dashes as a”, b”, c” and d” etc.

5)     Projectors are always drawn as continuous thin lines.

6)     Line with specific thickness for a particular type of line.

In Computer Aided Engineering Graphics for projection of solids following commands are used

other than evoking software, opening file, saving file and giving print command. Using these

minimum 13 commands any type of projection of line problem can be solved they are as follows:

1. Select tool Command.

2. Point command.

3. Poly-Line command.

4. Two Point Line command.

5. Parallel line command.

6. Center Circle command

7. Bisector command.

8. Smart Dimension command.

9. Line Width command.

10. Insert Text command.

11. Move Copy command.

12. Rectangle command.

13. Smart Delete Command