三坐标测量原理（Three coordinate measurement principle）.docVIP

三坐标测量原理（Three coordinate measurement principle） Principle: three coordinate measuring machine is composed of three mutually perpendicular axes X, Y, Z established a Cartesian coordinate system, all moving probe are carried out in this coordinate system, the trajectory measuring head is represented by measuring ball center. When measuring, the measured parts are placed on the worktable, and the measuring head is in contact with the surface of the parts. At the same time, the measuring system of the three coordinate measuring machine can give the precise position of the center of the ball in the coordinate system at any time. When the measuring ball moves along the geometric surface of the workpiece, the coordinate values of the points on the measured geometric surface can be obtained. These data are fed into the computer and processed by the corresponding software, so that the geometric size, the present situation and the position tolerance of the workpiece to be measured can be accurately calculated. Composition: measuring machine hardware consists of main engine (including grating ruler), electrical system and measuring head, software is also very important part. Categories: mobile bridge, fixed bridge, fixed work platform, cantilever type, Longmen style, L type bridge, movable table cantilever, horizontal cantilever, column type Three coordinate workpiece clamping 1. product shape retention Ensure that the shape of the assembly and each part in the measuring state is consistent with the use conditions, and shall not deform the product during clamping. For a rigid assembly, it should be placed naturally on the holder during loading and then strengthened. For flexible or deformed workpieces, they are forced to be restored to their working condition, and then mounted to the holder. Use the support tools such as brackets and pads to ensure the rigidity of each part and the whole assembly. Special attention should be paid to the disassembly of the assembly by layer by