Three-dimensional measurement device

A three-dimensional measurement system for measuring a shape of a surface of a target processed by a machine tool, wherein:

• the machine tool includes a tool magazine, a tool spindle for rotating tools, and an automatic tool changing device that picks up a second tool from the tool magazine and replaces a first tool currently clamped in the tool spindle with the second tool that was picked up from the tool magazine, wherein the machine tool further includes a controller having a controller clock;
• the system comprising:
• a measurement unit configured to be coupled to the machine tool, wherein the measurement unit is configured to output measurement data corresponding to a distance from the surface of the target processed by the machine tool, wherein the measurement unit includes a sensor, a measurement control unit, and a first wireless communication unit, wherein the measurement control unit includes a measurement control unit clock that generates measurement time data, wherein the measurement data is generated each time that data output from the sensor is acquired, and wherein the measurement data that is transmitted by the first wireless communication unit includes the measurement time data indicating a time at which the measurement data is generated, and
• a shape data generation unit that is configured to generate shape data corresponding to the shape of the target based on the measurement data from the measurement unit and based on data indicating a location and an orientation of the target from the controller, wherein the shape data generation unit includes a shape data generation unit clock that is aligned with the measurement control unit clock and that is aligned with the controller clock, and wherein the shape data generation unit is coupled to a second wireless communication unit that is communicatively coupled with the first wireless communication unit,
• wherein the shape data generation unit transmits a clock reset command with a current time data of the shape data generation unit to the measurement control unit and to the controller, and starts the shape data generation unit clock,
• wherein the measurement control unit receives the clock reset command and time data of the shape data generation unit clock, and sets a time of the measurement control unit clock to a time of the time data of the shape data generation unit clock,
• wherein the sensor outputs sensor time data to the measurement control unit,
• wherein the first wireless communication unit transmits the sensor time data to the second wireless communication unit,
• wherein the shape data generation unit terminates a timing from the restarted shape data generation unit clock and measures an amount of time from transmitting the clock reset command until the shape data generation unit receives the sensor time data to determine a first time stamp error,
• wherein the controller aligns the controller clock thereof with the time of the time data of the shape data generation unit clock and transmits the time of the control clock to the shape data generation unit and a second time stamp error is determined between the controller and the shape data generation unit,
• wherein the measurement control unit clock is aligned with the shape data generation unit clock by correcting for the first time stamp error for a data transmission between the measurement unit and the shape data generation unit, and the controller clock is aligned with the shape data generation unit clock by correcting for the second time stamp error for a data transmission between the controller and the shape data generation unit;
• and
• wherein the automatic tool changing device is able to attach the measurement unit to the tool spindle.