Auxiliary device for regrinding twist drills

摘要

An auxiliary device (35) for regrinding twist drills (2), with a receiving channel (58) for the twist drill (2) to be set against a grinding wheel, consists of a manually guided polyhedral body (56) which can be clamped onto the twist drill (2) and at the exit end (37) for the drill point (4) has a sight edge (59) running parallel to a main cutting edge of the drill and the underside (79) of which, designed as a surface for bearing on the grinding table or the like, is inclined relative to the drill axis by the clearance angle ( alpha ) of the main cutting edge, according to Patent Application P 3338910.1. So that satisfactory fixed positioning of the inserted twist drill (2) is always possible, in particular even in the case of a one-piece construction, a chuck (60) is arranged in the receiving channel (58), which chuck (60) can be actuated by a rear rotary grip (61) projecting from the polyhedral body (56). IMAGE