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Drilling Holes in Graphite/EpoxyRelatively long-lived bit produces high-quality holes. Effective combination of cutting-tool design, feed, and speed determined for drilling 3/16-and-1/4-in. (0.48-and 0.65-cm) diameter holes in 0.18 in. (0.46cm) thick GM3013A or equivalent graphite/epoxy corrugated spar without backup material and without coolant. Developed to produce holes in blind areas, optimal techniques yielded holes of high quality, with minimal or acceptable delamination and/or fiber extension on drill-exit side.
Document ID
19870000254
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Minlionica, Ronald
(Grumman Aerospace Corp.)
Date Acquired
August 13, 2013
Publication Date
May 1, 1987
Publication Information
Publication: NASA Tech Briefs
Volume: 11
Issue: 5
ISSN: 0145-319X
Subject Category
Fabrication Technology
Report/Patent Number
MSC-21120
Accession Number
87B10254
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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