DRILLING, REAMING, COUNTERBORING, THREADBORING, ETC. THROUGHOUT the design of every machined part the designer should follow the practice of visualizing the machining involved, and make a genuine effort to design for “machinability” by avoiding all difficult operations. This factor cannot be over‐emphasized, as it is only too easy to complicate the machining of a part unnecessarily by lack of forethought during the design.
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