... parallel lathe,vertical lathe,grinding machine,boring lathe,facing machine,spherical lathe Improve the metal surface roughness,the Ra value can ... effect as the main characteristics of reducing workpiece surface roughness. 3.The process of Shankeping polishing machineFirstly,to make ... processing 1, after shankeping polishing we can see workpiece roughness improved 3 class at least. (Ra value below 0 ...