Milling tool holder

A tool holder assembly comprising:

• an elongated tool holder body (10) having a longitudinal axis, an end surface (18), and an elongated shank-receiving bore (20) extending from said end surface along said longitudinal axis;
• a tool holder head (12) adapted to support at least one cutting insert;
• said tool header head comprising a cylindrical shank (56) slidably receivable in said shank-receiving bore, and an annular seat (54) axially alignable with said end surface;
• means (24, 58) for preventing relative rotation between said tool holder head and said tool holder body when said shank is slidably inserted into the bore;
• means for biasing said tool holder head along said longitudinal axis so that said annular seat has pressure engagement with said end surface on the tool holder body;
• said biasing means comprising two threaded openings (28, 30) in said tool holder body extending normal to said longitudinal axis in a common plane containing said longitudinal axis;
• said threaded openings being spaced about one hundred eighty degrees apart in the circumferential direction, said threaded openings also being spaced in the axial direction so that said openings communicate with said bore at axially spaced points therealong;
• said shank having two frusto-conical recesses (60, 62) adapted to register with said threaded openings when said shank is inserted into said bore;
• a threaded fastener (64, 66) threaded into each of said threaded openings to penetrate a respective frusto-conical recess, whereby said tool holder head is biased along said longitudinal axis.