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

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4

Scales

OBJECTIVES

After studying this chapter, you will be able to

  • Identify and construct various kinds of scales

  • Prepare a drawing to scale

  • Obtain accurate sizes of various parts of an object by scaling from the drawing

  • Use scales for applications such as preparing and reading maps

4.1 INTRODUCTION

A scale can be defined as a ratio of the reduction or enlargement on a map or a drawing. Physically, scales are usually strips made of cardboard, plastic, steel or other such material, with markings that give lengths in a fixed ratio of reduction or enlargement. These scales are available in the market for the standardized ratios as recommended by the Bureau of Indian Standards (BIS). For non-standard ratios, scales giving reduced or enlarged ...

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