In a tool holding portion of a machining tool, a cartridge is provided so as to be movable forward and backward. A cam accommodated inside a cam accommodation portion rotates while the cam is in abutment against the cartridge to thereby move the cartridge forward and backward. A rod which moves forward and backward inside a tool body along an axis is provided with an abutment portion. The abutment portion abuts against an abutment position of the cam according to the forward and backward movement of the rod to thereby rotate the cam. A restriction mechanism is capable of adjusting the phase of the cam when the abutment portion is apart from the abutment position so that a reference position is reached where the abutment position faces the abutment portion.

An apparatus includes a milling member capable of being driven in a rotational manner, and a plurality of blade carriers attached to the milling member. Each blade carrier has a blade for chip-removing processing of a profile. A first group of blade carriers is capable of being moved relative to the milling member. Each movable blade carrier is arranged so as to be able to be radially deflected on the milling member by an actuation member during a rotating movement of the milling member. The actuation member cyclically comes into contact with a formation of the blade carrier. In a first functional position, exclusively the blades of the first group of movable blade carriers of a track path move into engagement with the profile. In a second functional position, exclusively blades of a second group of blade carriers of the same track path move into engagement with the profile.

Described herein is an orbital drilling system that includes an orbital drilling machine and a cutter. The orbital drilling machine includes a spindle and an eccentric rotation mechanism. The spindle is rotatable about a cutter axis. The eccentric rotation mechanism is coupled to the spindle and configured to orbit the spindle about an orbital axis, offset from the cutter axis. The cutter is co-rotatably coupled to the spindle and comprises a plurality of cutting edges, collectively defining a cutting diameter of the cutter. The cutting diameter of the cutter is adjustable.

A cutting edge adjustment device for a cutting tool for adjusting the position of a cutting edge of a cutting insert by causing movement of the cutting insert includes a rotary member for producing the movement. The rotary member is formed into a shape in which a substantially cylindrical portion having a constant radius and a cam portion having a cam face whose radius is gradually increased in a manner corresponding to the amount of the movement are arranged in a direction of a rotational center axis. The cam face is formed in such a manner as to have a section in which a radius is linearly increased, and consequently, the unit rotational angle of the rotary member on the rotational center axis is proportional to the unit movement amount of the cutting insert.

Described herein is an orbital drilling system that includes an orbital drilling machine and a cutter. The orbital drilling machine includes a spindle and an eccentric rotation mechanism. The spindle is rotatable about a cutter axis. The eccentric rotation mechanism is coupled to the spindle and configured to orbit the spindle about an orbital axis, offset from the cutter axis. The cutter is co-rotatably coupled to the spindle and comprises a plurality of cutting edges, collectively defining a cutting diameter of the cutter. The cutting diameter of the cutter is adjustable.

Provided is a detachable tool detachably attached to a tool mounting hole of a tool holder including the tool mounting hole, and a retaining body disposed in the tool mounting hole in a radially inwardly reciprocable manner. The detachable tool includes: a housing supported at a predetermined position of the tool mounting hole, the housing including an elastic body chamber, and a retaining body insertion hole through which the retaining body is inserted; a slider to which a tip tool having a blade at a basal end portion is mountable, the slider supported by the housing to reciprocate inside the tool mounting hole, the slider having a guide groove extending along the tool mounting hole; an elastic body disposed in the elastic body chamber to urge the slider toward a basal end; and an anti-rotation body disposed in the housing to be received in the guide groove.