Patent ID: 11933638
Assignee: YAMAZAKI MAZAK CORPORATION
Field: Measurement (Instruments)
Classification: CPC B  G | IPC G

Claim 17:
18. A machine tool configured to detect a phase on a gear, the machine tool comprising:
a spindle which is configured to hold the gear and which is rotatable about a rotation axis of the spindle;
a sensor control circuit configured to determine whether the gear has been detected at a detection position;
an angle changer configured to change an angle of the detection position relative to a reference position in a circumferential direction of the rotation axis; and
a processor configured to obtain a determination result from the sensor control circuit and control the angle changer, the processor being configured to:
obtain a first determination result indicating whether the gear has been detected at a first detection position, the first detection position being at a first angle relative to the reference position in the circumferential direction;
obtain a second determination result that indicates whether the gear has been detected at a second detection position and that is different from the first determination result, the second detection position being at a second angle relative to the reference position in the circumferential direction, the second angle being different from the first angle;
obtain a third angle that is between the first angle and the second angle;
obtain a third determination result indicating whether the gear has been detected at a third detection position that is at the third angle relative to the reference position in the circumferential direction;
replace the first angle with the third angle when the third determination result and the first determination result are same, or the second angle with the third angle when the third determination result is different from the first determination result; and
detect the phase on the gear in the circumferential direction based on an angle that is between the first angle and the second angle.