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Engineering Drawing, 2nd Edition by B. C. Rana, M. B. Shah

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2

Symbolic Lines and Lettering

OBJECTIVES

After studying this chapter, you will be able to

  • Identify various types of lines and what they represent in engineering drawings and draw them

  • Identify the symmetry of an object

  • Show alternate positions like ON and OFF taken by a machine part (such as a switch or an operating lever) on a drawing, and also indicate the path taken while the part moves from one position to another

  • Identify various types of lettering and specify their use

2.1 INTRODUCTION

Lines can be considered to be letters in the language of engineering drawing. They enable a person to describe the external as well as the internal features of an object. As each symbolic line in the drawing represents a particular aspect, it is ...

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