There are many advantages to turning (pun intended) to an underutilized operation that virtually every machining center is capable of: OD turning — otherwise known as “outer diameter turning”, “pin turning”, or “boss milling”.
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A pilot or spot drill, also known as a starter drill, is typically required when the succeeding drill is longer than 10xD or smaller than Ø 1.00 mm. Starter drills can also be used to improve hole location due to their short, rigid geometries.