Page 58 - ENGINEERING DRAWING

51

CHAPTER 4 Geometric Dimensioning and Tolerance

4.1 Introduction

Drawing of a component, in addition, to provide complete shape description, must also
furnish information regarding the size description. All these are provided through the

distance between the surfaces, location of holes, nature of surface finish, type of material

and other information. The expression of these features on a drawing, using lines,

symbols, figures and notes is called dimensioning.

Figure 4.1 : Dimensioning elements

4.2 Principles of Dimensioning

There should be some basic principles used as a guide in doing dimensioning. The basic

principles of dimensioning as follow :

1. All the dimensional information necessary to describe a component clearly

and written directly on a drawing