What are two reasons for not having drill bushings actually touching the workpiece? Notice in Figure 29-8

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What are two reasons for not having drill bushings actually touching the workpiece? Notice in Figure 29-8 how many of the designs violate this rule. It is not uncommon to have conflicts and trade-offs in fixture design situations.
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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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