| US 7,465,133 B2 | ||
| Toolholder with retractable bushing | ||
| John S. Agapiou, Rochester Hills, Mich. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Apr. 10, 2006, as Appl. No. 11/401,178. | ||
| Prior Publication US 2007/0237597 A1, Oct. 11, 2007 | ||
| Int. Cl. B23C 1/00 (2006.01) | ||
| U.S. Cl. 409—231 [409/234] | 19 Claims |
| 1. An apparatus for machining a finished borehole in a workpiece, in a single pass, said apparatus comprising:
a tool configured to mill or ream the workpiece when in contact therewith and while rotating and translating relative thereto,
so as to produce the finished borehole in the workpiece;
a tool holder configured to rotate the tool and secure the tool in a fixed position relative to the tool holder, so as to
present a distal tool end; and
a first bushing retractably coupled to the tool holder, and presenting a support section laterally adjacent at least a portion
of, so as to limit deflection by, the tool, during machining,
said tool and bushing being cooperatively configured so that the bushing contacts the workpiece after the tool, and slidably
engages the tool during at least a portion of the tool translation period.
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