分度圆分离系数
separate coefficient of normal pitch circle
百分分度
centesimal graduation
centesimal circle graduation
分度圆
standard pitch circle
concentric grade
reference circle
Graduated circle
standard (cutting) pitch circle
pitch circle
分度圆螺旋角
spiral angle of graduated circle
分度圆柱导程角
lead angle at reference cylinder
分度圆柱螺旋角
helix angle at reference cylinder