An abnormality diagnostic device for a feed axis mechanism diagnoses an abnormality occurrence and an abnormal portion of the feed axis mechanism. The feed axis mechanism transmits a rotation of a motor to a ball screw coupled by a coupling to rotate the ball screw. The abnormality diagnostic device includes a resonance frequency measuring unit and a diagnosis unit. The resonance frequency measuring unit measures a resonance frequency at a plurality of stroke positions within a stroke range of the feed axis mechanism. The diagnosis unit identifies the abnormal portion based on a relationship between the stroke positions and change amounts relative to a standard value of the measured respective resonance frequencies.

An abnormality diagnostic device for a feed axis mechanism diagnoses an abnormality occurrence and an abnormal portion of the feed axis mechanism. The feed axis mechanism transmits a rotation of a motor to a ball screw coupled by a coupling to rotate the ball screw. The abnormality diagnostic device includes a resonance frequency measuring unit and a diagnosis unit. The resonance frequency measuring unit measures a resonance frequency at a plurality of stroke positions within a stroke range of the feed axis mechanism. The diagnosis unit identifies the abnormal portion based on a relationship between the stroke positions and change amounts relative to a standard value of the measured respective resonance frequencies.

The invention relates to a spindle device (100), comprising: a tool holder (14) for holding a tool or a tool interface; a spindle drive comprising a spindle rotor (130) for rotationally driving the tool holder (14); an electrical load (160), which is arranged on the side of the spindle rotor (130) facing the tool holder (14); and a coil unit (140) for supplying electrical energy to the electrical load (160); wherein the coil unit (140) is arranged on the side of the spindle rotor (130) facing away from the tool holder (14).

In a method for monitoring an operating behavior of a tool holder, a resultant measurement axis signal is calculated using at least two measurement axis signals of at least two radially oriented measurement axes of a sensor provided in the tool holder. The monitoring is performed using the resultant measurement axis signal or the resultant.

A turning tool includes a power receiving coil, a sensor, and a wireless unit. The power receiving coil receives power transmitted from a power transmitting coil in a non-contact manner. The sensor is electrically connected to the power receiving coil. The wireless unit transmits data detected by the sensor to an outside.

A measurement device for a chip removing machine, and methods of obtaining frequency response functions, obtaining stability charts and selecting operational parameters of a chip removing machining tool are disclosed. The device includes an engagement portion at the rear end for engagement with the machine and a measurement portion at the front end. The measurement portion is without a tool tip and includes a planar front end surface perpendicular to the centre axis. The front end surface has a coupling point aligned with the centre axis for receiving mechanical excitation. The front end surface further includes a plurality of seats for receiving one accelerometer each for measuring a response of the received mechanical excitation. When an accelerometer is received in one of the seats, and abutts against three contact surfaces thereof, it is positioned and oriented three dimensionally and around three axes of rotation in relation to the coupling point.

A measurement device for a chip removing machine, and methods of obtaining frequency response functions, obtaining stability charts and selecting operational parameters of a chip removing machining tool are disclosed. The device includes an engagement portion at the rear end for engagement with the machine and a measurement portion at the front end. The measurement portion is without a tool tip and includes a planar front end surface perpendicular to the centre axis. The front end surface has a coupling point aligned with the centre axis for receiving mechanical excitation. The front end surface further includes a plurality of seats for receiving one accelerometer each for measuring a response of the received mechanical excitation. When an accelerometer is received in one of the seats, and abutts against three contact surfaces thereof, it is positioned and oriented three dimensionally and around three axes of rotation in relation to the coupling point.

An abnormality detection device of a machine tool includes a plurality of vibration sensors mounted on a body of the machine tool at a plurality of positions; and a determination portion that determines an operation condition of the machine tool based on vibration information detected by the vibration sensors. The abnormality detection device detects abnormality of the machine tool according to determination information of the determination portion. The determination portion specifies a predetermined item whose machining accuracy lowers based on the mounted position of the vibration sensor that has detected abnormal vibration.

A method of detecting machine tool vibration is provided. The method includes receiving, from a sensor arranged in a machine tool, motion data measured along an axis. The method also includes comparing the motion data against a first threshold. The method also includes adjusting a counter if the motion data has a magnitude greater than the first threshold. The method also includes generating an alarm if the counter is greater than a second threshold.

A method of detecting machine tool vibration is provided. The method includes receiving, from a sensor arranged in a machine tool, motion data measured along an axis. The method also includes comparing the motion data against a first threshold. The method also includes adjusting a counter if the motion data has a magnitude greater than the first threshold. The method also includes generating an alarm if the counter is greater than a second threshold.