CMM is typical delegate of contact measurementComparing to uncontact measurement,CMM is slow ,but it has upper measurement precision.

• 坐标测量机(Coordinate Measuring Machine,CMM)是接触式数字化设备的典型代表。 和非接触测量方法相比，CMM虽然在数字化速度上比较低，但是它具有较高的测量精度。