The machine is equipped with one or two spindles in various kinds of configuration. Depending upon the various material of components and grinding technologies, the machine comes with a number of optional wheels with different material, linear speed, feed speed, and grinding processes, which greatly enhances efficiency and precision of components during processing. The internal bore can be ground in the range of diameters from 4mm to 50mm according to different configurations and compositions. Not only single-step through-hole and bore but also multi-step hole and bore can be ground at the same time in one clamping. The spindle rotating speed range could reach from 36000 rpm to 120000 rpm based on the particular configuration.