Detection and Compensaion in Working Platform Surface of Three-coordinate Measuring Machine

Three-coordinate measuring machine is widely applied for mechanical parts measurement, whose accuracy affects surveyed parts' accuracy directly. In this paper, dial indicator and gauge block were used to detect twenty spots in working surface of optics-electric no-contract three-coordinate measuring machine. The results show that parallel-level between working platform surface and XOY moving plane is beyond the error bounds. The author adopts error compensation method, which includes that we define a spot and draw two straight lines respectively paralleling with XOZ and YOZ plane to obtain an angle through the spot, then find a compensation plane on the basis of them. Parallel-level between compensated working platform surface and XOY moving plane is within the error bounds. The design desire of working surface is achieved. Therefore, error compensation is an effective way to improve accuracy of machine.