Adjustable tool holder for precisely repositioning reground cutter inserts

Claim 1

An adjustable tool holder for precisely reposigioning the cutting edge of a reground undersized cutter insert in the original location which it occupied before regrinding, said tool holder comprising a tool-holder body having an elongated mounting shank and having an enlarged head containing a cutter-insert-receiving recess with a cutter-insert seat surface therein, a cutter-insert-locator guideway disposed transverse to said recess and communicating therewith, a cutter-insert locator mounted in said locator guideway for adjustment motion longitudinally therealong, a fine adjustment device operatively connected to said locator for moving said locator by minute increments relatively to said head, and a clamping instrumentality on said head movable into and out of clamping relationship with a cutter insert in said recess, saId fine adjustment device including a threaded bore in said head communicating with said locator guideway, and also including a fine adjustment screw-threaded member mounted in said threaded bore in position-adjusting relationship with said locator, said threaded bore being disposed obliquely to said locator guideway, said locator having a substantially flat abutment surface thereon disposed at an oblique angle to the axis of said screw-threaded member, and said screw-threaded member having a tip of approximately conical shape thereon operatively engageable with said abutment surface.