Method for examining the clamping state during acceleration phase

A method for examining the clamping state of a tool holder and/or a tool which is clamped in a tool clamping device of a rotor unit of a motor-driven machine tool unit, wherein the tool holder and/or the tool is/are releasably fixed and clamped by a tool clamping device which can be acted on with a clamping force, wherein the tool clamping device is displaced in the longitudinal direction of the rotation axis when the tool is clamped, wherein the tool clamping device is arranged in the spindle head of the rotor unit, wherein the machine tool unit has a stator unit, with respect to which the rotor unit is rotatably supported about a rotation axis, wherein the method comprises the following method steps:

• providing at least one sensor head for determining a spacing,
• arranging the sensor head at a position on the stator unit,
• measuring the spacing of the sensor head from a portion of the rotor unit,
• recording at least one time and/or position-related sequence of the spacing values measured with the sensor head,
• determining an axial run-out and/or a concentricity deviation and/or an angular change exclusively taking into account the time and/or position-related sequence of the measured spacing values with respect to the portion of the spindle head which is rotating relative to the sensor head,
• wherein a marking is provided on the rotor unit,
• wherein the sensor head detects the marking (N) on the rotor unit during measuring,
• wherein with reference to the marking using the sensor head the current speed (v0, v1) of the rotor unit is detected,
• wherein the recording of a first and a second time and/or position-related sequence of the spacing values measured with the sensor head is carried out during an acceleration of the rotation of the rotor unit with respect to the stator unit,
• wherein the respective current speed is associated with the spacing values of the first and second sequence in order to form a sequence vector from the spacing value, the time and/or position-related information and the current speed (v0),
• wherein the time and/or position-related information of the sequence vectors of the first and/or second sequence is scaled using the respective associated current speed (v0) so that the sequence vectors of the respective sequences each have at least one spacing value at corresponding positions on the rotor unit,
• braking the rotor unit when an axial-run out deviation is identified.