| 摘要 |
An apparatus for determining the profile of a cylindrical workpiece whose radius varies with axial position. The apparatus is equipped with a spindle head and a pair of detectors. The spindle head supports and rotates the workpiece. The detectors are mounted on opposite sides of the axis of rotation of the workpiece and detect the position of the outer surface of the workpiece. When the workpiece is being rotated, the spindle head is moved parallel to the axis of the spindle. As a result, the detectors cross the outer surface of the workpiece. Also, the detectors are moved radially along an ideal profile of the workpiece in synchronism with the movement of the head. A control unit calculates the average of first and second output signals from the detectors, respectively, and produces the average as the profile error. In another embodiment, only one detector is used. The control unit measures the profile while the detector is positioned on one side of the axis of the spindle. The output signal from the detector is stored as a first output signal in the control unit. Then, the detector is moved to the opposite side of the axis of the spindle. Under this condition, the profile is again measured. The output signal from the detector is stored as a second output signal. The profile error is calculated from the average of the stored, first and second output signals.
|
