A grinding method in which the workpiece is projected on a screen at 20x (50x is also possible) to optically check the status of the workpiece while it is being machined to follow the desired shape. Various grindstones are used according to the material, processing shape, surface accuracy, etc.
Possible to perform 360 degree continuous machining on the workpiece fixed on vise with rotating shaft, and machine with a high-precision spindle to obtain required finished surface and dimensional accuracy.