NASA NTRS · 19840000163
Countersink Drill
Abstract
Efficient drill design for countersinking or metal drilling uses only two flutes instead of three and made of carbide instead of "high-speed" steel. Tool performance and service life increased.
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Hernandez, R. J.. 1985-01-01. Countersink Drill. https://ntrs.nasa.gov/citations/19840000163
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