This equation is useful in determining the kinematic linkage between the lathe spindle and the leadscrew and enables proper selection of the gear train between them.
这公式在决定车床心轴和丝杆之间的运动学关系时很有用，并且提供了正确挑选它们之间轮系的方法。
2
This simple but accurate method is useful in machining a ball-lead-screw, especially when no dimensional numerical-control milling machine is available.
Three mutual engagement of the screwin the pump cylinder for each lead of the formation of a sealed chamber, causing the seal between the suction mouth.