The invention relates to an anti-vibration plug for machining tubes and to a method for placing said plug inside a tube, wherein the plug comprises a central body (2) with arms (3) that open radially outwards intended to come into contact with the inside of the tube (1), a blocking screen (4) being arranged between the central body (2) and the arms (3), which blocks the inside of the tube (1) in the open position of the arms (3), whereas the central body (2) has an axial hole (5) wherein there is housed a piston (6) which movably acts on a peripheral part (8) which surrounds the central body (2) and generates the movement of the arms (3), the peripheral part (8) being subjected to a pushing force exerted by an elastic element (10) in the opposite direction to that in which the piston (6) pushes.

An ultrasonic machining module that includes an ultrasonic transducer, wherein the ultrasonic transducer is adapted to receive a machining tool and a vibration-isolating housing adapted to be both compatible with a machining system and to receive the ultrasonic transducer therein, wherein the housing further includes at least one modification for isolating all vibrations generated by the ultrasonic transducer when the device is in operation except axial vibrations transmitted to the machining tool, thereby preventing unwanted vibrations from traveling backward or upward into the machining system.

A main spindle located in a region of a rotary guide bush device where the rotary guide bush device (has been attached to be disposed in a position of a front (F) along an axis (C) direction when the rotary guide bush device having a guide bush, which is supported in a removable manner by a guide bush-supporting base (supporting base) provided in the front (F) along the axis (C) direction of the main spindle, is removed. A seal member (fixed to the guide bush-supporting base has contact with an outer circumferential surface of a main spindle cover over an entire circumference, so that processing with or without the guide bush can be selected and a complicated process required for switching the processing with or without the guide bush can be simplified.

A cutting tool may include a base body, a tip, a sensor, and a cover. The base body may have a shank portion extending in a first direction, a fixation portion, and a recess opening at an outside surface of the shank portion. The tip may be fixed to the fixation portion and may have a cutting edge. The sensor may be positioned inside the recess. The cover may close the recess. Among peripheral surfaces of the shank portion, a first area may face one side in a second direction that is a direction orthogonal to the first direction, and the cutting edge may be positioned further toward the one side in the second direction from the first area. The entirety of the cover may be positioned further toward the other side in the second direction from the cutting edge.