NASA NTRS · 19920000566
Precise Countersinking Tool
Abstract
Tool countersinks holes precisely with only portable drill; does not require costly machine tool. Replaceable pilot stub aligns axis of tool with centerline of hole. Ensures precise cut even with imprecise drill. Designed for relatively low cutting speeds.
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Jenkins, Eric S., Smith, William N.. 1992-09-01. Precise Countersinking Tool. https://ntrs.nasa.gov/citations/19920000566
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