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

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21

Computer-Aided Drafting

OBJECTIVES

After reading this chapter, you will be able to

  • Draw straight lines, curved lines, arcs, circles, polygons, ellipses and elliptical arcs without using drawing instruments
  • Prepare accurate drawings of machine parts and enlarge, reduce, copy and rotate them
  • Change the type, thicknesses, and color of symbolic lines, and erase any selected line
  • Dimension drawings to describe the size of the object perfectly
21.1 INTRODUCTION

The preparation of engineering drawings with the help of a drawing board, a minidrafter, set squares, dividers, compasses and other instruments is a laborious process. Computer-aided drafting (CAD) helps in preparing drawings without the use of the usual drawing instruments. The ...

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