機械數(shù)控外文翻譯---普通車床的主軸箱-數(shù)控設(shè)計-全文預(yù)覽
【正文】 n the bull gear is pulled out (when the pin is out, the pulley and pinion gear will turn, but the spindle will not turn). Pull the back gear handle forward to mesh the back gears with bull gear F and pinion gear E. Do this by turning the step pulley by handnever while the power is on. When engaged, power is delivered directly to the bull gear (F) and spindle by the back gears. At the left end of the headstock assembly is a feed reverse lever. It is used for reversing, the direction or movement of the lead screw. This lever can be moved to three positions. When it is in the upper position with the automatic feed engaged, the carriage will move toward the headstock (to the left) and the crossfeed will move in. When in the center position, the gears are out of mesh and the lead screw will not move. When in the lower position with the automatic feed engaged, the carriage will move toward the tailstock (to the right) and the crossfeed will move out. Vbelt drive. A Vshaped groove is cut around the circumference of each pulley, and a V belt fits accurately into this groove. The V belt does not touch the bottom of the pulley. This type of drive has a back gear arrangement similar to that used on flat belt machines. Variablespeed driver. In this arrangement it is possible to change the speed between the driver and driven pulleys without stopping the lathe. In fact, the speed must be changed only when the machine is running. The driving pulley of a variablespeed drive i
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