The drills shown in Figure 24-12 have coolant passages in the flutes. What is the purpose of

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The drills shown in Figure 24-12 have coolant passages in the flutes. What is the purpose of these holes?
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Materials and process in manufacturing

ISBN: 978-0471656531

9th edition

Authors: E. Paul DeGarmo, J T. Black, Ronald A. Kohser

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