It is a difficult problem that ensuring precision of angle and symmetry of nonstandard double key groove,this paper relays on tool direction to adjust and readjust dial disc to slove it.

• 非标双键槽,其角度及对称度的精度在加工中很难保证,依靠刀具的方位调整及微调刻度盘,成功地解决了这一难题。