Gauge for calibrating three-dimensional coordinate measuring machine and method for calibrating three-dimensional coordinate measuring machine using the gauge

摘要

A CMM calibrating gauge includes a block gauge which has a first end face and an opposite second end face and whose length absolute value has been certified, and a sphere fixed to a front surface of the block gauge. A method for calibrating a CMM using the CMM calibrating gauge includes the steps of bringing a probe of the CMM into contact with the first end face of the block gauge to specify planarity of the first end face, bringing the probe into contact with the peripheral surface and the pole point of the sphere to specify coordinates of the center of the sphere relative to the first end face and the diameter of the sphere, bringing the probe into contact with the second end face of the block gauge to measure planarity of the second end face, and bringing the probe into contact with the peripheral surface and the pole point of the sphere to measure coordinates of the center of the sphere relative to the second end face and the diameter of the sphere and revise the specified planarity of the first end face and the specified sphere center coordinates and sphere diameter, thereby specifying three-dimensional dimensions of the CMM calibrating gauge to calibrating the CMM.