渐开线斜齿轮公法线测量可用于计算齿轮的模数、齿厚等参数.但是,由于某些原因,如:齿轮齿数太少,或齿宽太窄,或塔轮距离很近或短齿(如渐开线花键)等等,使得斜齿轮的公法线测量难以进行或者根本不能进行,以及目前斜齿内齿轮尚不能进行公法线测量.这时可用本文推导的公式,通过跨棒(球)测量计算解决之.与此同时还可以获得基园螺旋角参数. The involute helical gear common normal measurement can be used to calculate gear moduli, tooth thicknesses, etc. However, for some reasons such as too few gear teeth, too narrow tooth widths, or too short tower gears or short teeth (Such as involute spline), etc., making the helical gear of the public normal measurement is difficult or impossible at all, and the present helical gear can not be measured in the public normal line can now use the formula derived by cross rod Ball) measurement and calculation solution.At the same time can also be based on the base of the helix angle parameters.