This dissertation is concerned with Accuracy Design of LM Guide system in Machine Tools. Elastic deformation of ball is calculated by Hertz contact theory and motion accuracy of LM block is analyzed. A new algorithm using block stiffness is proposed for the analysis of motion accuracy of the table. A new algorithm takes pride in fast analysis speed because it isn't necessary iteration processes for satisfying equilibrium equation of the table. Furthermore, this algorithm is flexible of block number and length between two blocks.
Motion errors of the table analyzed under artificial form error of rail theoretically and experimentally. Only one of two rails is bent by putting a shim into horizontal direction. This form error of rail is measured by gap sensor against the other rail. Then, motion errors of the table are predicted by proposed new algorithm theoretically and measured by laser interferometer. Measurements are carried out by changing the preload and shim thickness. The results show that the table motion errors are reduced from 1/2 to 1/60 times than form error of rail according to its height and width. And the effect of preloading is almost negligible. A special matrix has been prepared for predicting machining error of workpiece resulted from motion errors of the table.