Hard finishing machine

Hard finishing machine for machining workpieces with at least one gearing or with at least one profile, in particular a gear grinding machine, comprising at least one spindle rotated by a motor, wherein the spindle has at a first axial position a first sensor system for detecting the rotation, in particular the rotational angle and/or the rotational speed and/or the rotational acceleration, of the spindle at the first axial position, wherein the first sensor system is connected to a control unit for controlling the rotation of the spindle, wherein at a second axial position of the spindle, which is different from the first axial position, a second sensor system is arranged, which is designed to detect the rotation, in particular the rotational angle and/or the rotational speed and/or the rotational acceleration, of the spindle at the second axial position, wherein the second sensor system is connected to a measuring device,

• wherein a further sensor system is arranged at the first axial position of the spindle, which is designed to detect the rotation, in particular the rotational angle and/or the rotational speed and/or the rotational acceleration, of the spindle at the first axial position, which is also connected to the measuring device,
• wherein the first sensor system at the first axial position comprises a measuring tape connected to the rotating part of the spindle and a reading head connected to the non-rotating part of the spindle for reading the signals of the measuring tape, wherein the further sensor system at the first axial position of the spindle comprises a further reading head for reading the signals of the measuring tape, wherein the second sensor system at the second axial position comprises a further measuring tape connected to the rotating part of the spindle and a further reading head connected to the non-rotating part of the spindle for reading the signals of the further measuring tape.