Abstract: A cutter including a chisel wheel having an axis of rotation about which the wheel is adapted to rotate during a cutting operation; a plurality of cutting tools each including a tool body having a longitudinal axis, a chisel bit and a chisel shank; the chisel wheel carrying chisel holders which freely rotatably mount each cutting tool for rotation about its associated axis, each chisel bit being a separate hard metal body fixed to an end portion of its associated tool body remote from its associated shank, each chisel bit having a cone shaped working section merging toward an apex portion, a plurality of peripherally spaced axially extending grooves formed in the cone-shaped working section which automatically rotate each cutting tool about its longitudinal axis during the operation of the chisel wheel, and each longitudinal axis setting-off with a plane normal to the axis of rotation of the chisel and included angle of up to generally 45.degree.

Abstract: The round cutting tool (10) comprises a substantially cylindrical shank (11), carrying a separately manufactured annular collar (14) slipped subsequently on the shank and abutting against a stop element (13). As a result thereof, material and energy costs are considerably reduced during the production of the round cutting tool because it is not produced in total in one piece in removing material by dressing.

Abstract: The invention relates to a milling tool for a rotating milling cylinder with milling head possibly equipped with hard metal, for milling away bonded mineral materials, having a stop part and retaining part for insertion into the radially outwardly open tool holder arranged on the milling cylinder circumference, in which holder the tool is arrestable by means of push-in bolts, while the retaining and stop part insertable into the tool holder is provided on each of its two ends with a milling head the maximum cross-sectional dimensions of which are such that they do not protrude beyond the cross-sectional area of the retaining and stop part, and the stop part finds its abutment in the tool holder.