e Spindle: a short shaft. It may be slender or tapered, a spindle is capable of rotating or of having a body rotate upon it ●主轴:主轴是一个较短的轴,可能是细长的, 也可能是锥形的,主轴能转动,或者有一物体 绕其转动
⚫ Spindle: a short shaft. It may be slender or tapered, a spindle is capable of rotating or of having a body rotate upon it. ⚫ 主轴：主轴是一个较短的轴，可能是细长的， 也可能是锥形的，主轴能转动，或者有一物体 绕其转动
o Lathe size is determined by the swing and the length of the bed (Fig. 4-1) o The swing is twice the distance from the live center point of the spindle to the top of the bed, or the largest diameter that can be turned over the ways of a lathe 机床的尺寸是由其可加工工件回转直径和床身长度决定的(如图1所示), 加工工件回转直径是从是车床心轴中心点到床身顶部距离的两倍
⚫ Lathe size is determined by the swing and the length of the bed（Fig．4-1）． ⚫ The swing is twice the distance from the live center point of the spindle to the top of the bed，or the largest diameter that can be turned over the ways of a lathe． 机床的尺寸是由其可加工工件回转直径和床身长度决定的（如图1所示）， 加工工件回转直径是从是车床心轴中心点到床身顶部距离的两倍
B A-Swing B-Distance between centers C-Length of Bed D-Radius(one half of swing) Fig4-1 size is indicated by swing and the length of the bed
⚫ Fig4-1 size is indicated by swing and the length of the bed
o For example, a 10-in lathe will turn a 10-in diameter workpiece over the ways but not over the carriage cross-feed slide. Sometimes two numbers are used to indicated swing, such as 17-12 o The 17-in. swing would be over the bed and the 12 in. swing over the cross slide 例如10英寸的车床可以加工10英寸的工件,但其尺寸不能超过横向进刀滑座。 有时两个数字被用来表示回转直径,比如17-12,17英寸回转直径将要超出 床身,而12英寸回转直径超出了横向进刀滑座
⚫ For example，a 10-in.lathe will turn a l0-in.diameter workpiece over the ways，but not over the carriage cross-feed slide．Sometimes two numbers are used to indicated swing，such as 17-12． ⚫ The 17-in.swing would be over the bed and the 12- in．swing over the cross slide． 例如10英寸的车床可以加工10英寸的工件，但其尺寸不能超过横向进刀滑座。 有时两个数字被用来表示回转直径，比如17--12，17英寸回转直径将要超出 床身，而12英寸回转直径超出了横向进刀滑座
(2) Headstock: a part of a lathe that holds the revolving spindle and its attachment 主轴箱:车床的一部分,其上安装有主轴及附件 The lengt ne bed includes the part the headstock rests on It determines also the distance between centers Center: one of two tapered metal rods that support work in a lathe or grinking machine and about or with which the work revolves 顶尖:车床或磨床上两个锥形金属棒中的一个,它用来支持工件围绕着顶尖 转动,或依靠顶尖转动。 床身长度包括安装床头箱部分。它也决定了两中心的距离
⚫ The length of the bed includes the part the headstock rests on． ⚫ It determines also the distance between centers． 床身长度包括安装床头箱部分。它也决定了两中心的距离。 (2) Headstock：a part of a lathe that holds the revolving spindle and its attachment. 主轴箱：车床的一部分，其上安装有主轴及附件。 Center：one of two tapered metal rods that support work in a lathe or grinking machine and about or with which the work revolves. 顶尖：车床或磨床上两个锥形金属棒中的一个，它用来支持工件围绕着顶尖 转动，或依靠顶尖转动