Patent ID: 8316553

Claim:
A coordinate measuring machine, comprising: a probe including a stylus whose tip end is provided with a measurement piece that is movable within a predetermined range; and a drive mechanism that supports and drives the probe, the coordinate measuring machine measuring an object based on a displacement of the measurement piece and a displacement of the probe, wherein the probe further includes a measurement-piece drive unit that drives the stylus in axis directions to drive the measurement piece; the coordinate measuring machine includes: a drive controller that outputs a position command for driving the stylus and the probe to the measurement-piece drive unit and the drive mechanism; a first measuring unit that measures the displacement of the measurement piece in each of the axis directions after the measurement piece is driven by the measurement-piece drive unit; a second measuring unit that measures the displacement of the probe; a measurement accuracy of the second measuring unit is lower than a measurement accuracy of the first measuring unit; and, when a measurement area of the object is divided in two areas including a small area and a large area, the drive controller outputs the position command for driving the measurement-piece drive unit when the small area is measured and outputs the position command for driving the drive unit when the large area is measured.