機械數(shù)控外文翻譯---普通車床的主軸箱-數(shù)控設(shè)計-在線瀏覽
2025-03-24 06:10本頁面
【正文】 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 is made with parts having Vshaped sides. One side of the pulley may be opened or spread apart from the other side. As it spreads apart, the belt moves inward toward the smaller diameter, producing a slower speed on the driven pulley. As the sides of the pulley are brought together, the belt is forced outward toward the large diameter which increases the speed of the driven pulley. The speed change may be done e
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號-1