High Precision Granite Machine Parts
The main advantages of granite are small deformation, good stability, no rust, easy to make plane processing, easy to achieve a higher flatness than cast iron, suitable for making high-precision platform and guide rail. At present many three coordinate measuring machines use this material. For example, Leitz and Zeiss three coordinate measuring machines are mostly made of granite materials. The base, workbench, bridge frame, guide rails of each axis and Z axis of the full-granite fixed-bridge high-precision CMM can be manufactured entirely from granite. Granite can be used as worktable, square, column, cross beam, guideway, bracket, shell and so on. Because the thermal expansion coefficient of granite is small, it is very suitable for matching with air floating guideway.