When the vertical turret decline, due to friction hinder its decline, the screw on helical screw nut under the physiognomy contact screw nut in the space below.
当垂直刀架下降时，由于摩擦力阻碍其下降，使丝杆的上螺旋面螺母的下螺旋面相接触，丝杆螺母的间隙在下面。
The initial contact of helical gear teeth is a point, which changes into a line as the teeth come into more engagement.
斜齿轮轮齿的初始接触是一点，当齿进入更多的啮合时，它就变成线。
The mesh stiffness of a pair of helical gears is calculated by substituting the variance of the contact line length for the variance of the instantaneous mesh stiffness.
运用傅立叶级数的形式，计算了一对宽斜齿轮副的瞬时啮合刚度及一对啮合轮齿的啮合刚度；
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