用齿轮分头车制多头螺纹,是一种分头均匀,准确可靠的方法。但是由于车床齿轮的限制往往达不到分头的目的,如车床C620、CA6140、国外N6,它们的主动轮分别为32、64、59齿,这几个齿轮均不能被3、5、7等整数除尽,又如C630车床主动轮为72齿,也不能被5等数整除尽,所以均不能用齿轮进行分头。在这种情况下,多采用小刀架分头,但摇小刀架分头是不准确的。为了保证精度,现推算了一个齿轮分头补差法的公式,用这种方 Split the car with a gear long thread, is a uniform, accurate and reliable method. However, due to the limitation of lathe gears are often not up to the purpose of separate parts, such as lathe C620, CA6140, foreign N6, their active wheels were 32,64,59 teeth, these gears can not 3,5,7 and other integers In addition, if the driving wheel of the C630 lathe is 72 teeth, it can not be divisible by 5 equal numbers, so no gear can be used separately. In this case, the use of a small turret more separate, but the shaver turret is not accurate. In order to ensure the accuracy, we now calculate a formula of gear compensation method, using this method