Patent ID: 8132335

Claim:
An apparatus for checking an accuracy of a circular path to be performed by a work spindle or a machine table, comprising: a clamping element which is coaxially attached on the work spindle, a first rotary bearing attached on the clamping element and having a first rotation axis coaxial with a rotation axis of the work spindle, a measurement arm with a first pivot bearing having a first pivot axis orthogonal to the rotation axis of the clamping element, a length measurement system disposed in measurement arm and comprising a glass rod with a marking and a reading device for determining a radial deviation of the work spindle from a circular path, an adjusting device receiving the measurement arm and having a second pivot bearing with a pivot axis aligned parallel to the first pivot axis, a second rotary bearing having a second rotation axis aligned parallel to the rotation axis of the work spindle, and a stator supporting the second rotary bearing.