NASA NTRS · 19660000168
Modified drill permits one-step drilling operation
Abstract
Drill with modified cutting faces permits one-step drilling operation without chatter upon contact and premature wear. The modification of the drill, which has the same diameter as that of the desired hole, consists of a groove across the bottom of each of the cutting faces of the drill flutes.
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Libertone, C.. 1966-04-01. Modified drill permits one-step drilling operation. https://ntrs.nasa.gov/citations/19660000168
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