Personally, do you think the processing procedure and speed are unreasonable?

If you cut directly at X 25 with five wide knives,

It is suggested that the shape of the groove be turned out like the outer circle of the car. Clean the roots with a knife

Is the groove width of the forming knife too small? Try cutting and grooving with a common YW 1 or YW2 knife. The recommended groove width is 3 mm to 5 mm.

Is 300 rpm too slow?