NASA NTRS · 19700000529
Adjustable drill bar replaces complex jigs
Abstract
Adjustable drill bar incorporates a micrometer screw which, when used in conjunction with standard gage blocks, provides rapid method of drill hole location and reduces time and skill requirements for precision drilling on large surfaces. Device picks up oddly dimensioned tool hole points and acts as sine drill bar.
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Coventry, J. H.. 1970-12-01. Adjustable drill bar replaces complex jigs. https://ntrs.nasa.gov/citations/19700000529
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