常用的齿条是标准模数,设计方便。但在某些进给系统,例如钻床进刀齿条、转塔车床进刀齿条等,要求齿轮旋转一周,齿条移动的距离为某一整数值M,即πd节=M(d节-齿轮节圆直径,M-整数值),也可写成πmz=M。由于齿数z是整数,所以模数m不可能是整数值,才能获得齿条移动的距离为整数值。 Commonly used rack is the standard modulus, easy to design. However, in some feed systems, such as drilling feed racks, turret lathe feed racks, etc., require gear rotation a week, the rack movement distance of an integer value M, that πd section = M (d - Gear pitch circle diameter, M-integer value), can also be written as πmz = M. Since the number of teeth z is an integer, the modulo m can not be an integer value in order to obtain a rack movement distance of an integer value.