We called them "submarines." Tough, 17-4 PH stainless steel forgings shaped like miniature German U-boats, each requiring several ¼" (6.4mm) through-holes to be drilled at a 25° angle. Each sub was loaded into a jig that held it at the required angle, and a metal plate fitted with hardened steel bushings was then clamped to the top of the jig before the holes were produced with a drill press.
Imported from the CTE archive to seed discussion on MFGAxis.
Originally published on CTE: 2017-01-15
CTE source: https://ctemag.com/articles/tips-techniques-nonperpendicular-holemaking/
Legacy path: /articles/tips-techniques-nonperpendicular-holemaking