... different shapes; 3.Suitable for all kinds of metallic; grinding machine Brief: 1. Obtain surface roughness less than Ra0.1 ... in all kinds of machine tools,such as lathe,grinding machine,boring machine,milling machine,planning machine,spherical lathe and CNC machine tools,ect, just only ... process,the ball impacts the surface 30,000 times per second with very little press about 2.5N,the temperature ...