Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 1 - Section 1.8 - Multiplication and Division of Fractions - Exercise - Page 48: 53


8$\frac{2}{3}$ min

Work Step by Step

Let the cutting tool on the lathe moves $\frac{3}{128}$ in. along the piece The piece revolves at 45 revolution per minute We need to find the time it will take to turn a 9$\frac{9}{64}$ in length stock in one operation therefore No of revolution = 9$\frac{9}{64} \div$ $\frac{3}{128}$ in = $\frac{585}{64} \div$ $\frac{3}{128}$ in = $\frac{585}{64} \times $ $\frac{128}{3}$ in = 390 revolutions Time = 390 revolution $ \times $ $\frac{1 min}{45 revolution}$ =$\frac{26}{3}$ min =8$\frac{2}{3}$ min
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