Question

拜托高手帮我翻译一下专业英语，急急急用啊，在次感激不尽！！！在线等啊！回答得好还会追加分！

For efficient operation of numerically controlled machine tools it is essential that the correct tools are available at the time required. There are a number of tool changing arrangements， which can be classified into three main types: manual， turret and magazine.
Work holders
The work holders generally used are: chucks； vices； pallets， subtables or fixtures； and grid plates.
There are two main types of chucks used: three-jaw chucks and collet chucks. Chucks with three self-centering jaws are commonly used on turning centers and are capable of holding work with a wide range of size. Collet chucks are widely used on turning centers. The individual collets can only accommodate a limited variation in the size of work. Collet chucks hold the work accurately and efficiently and can be programmed to be operated automatically as required.
A stepped jaw vice is one of the easiest methods of holding work that is to be manually loaded on drilling and milling machines. One of the limitations in the use of vices is that the maximum work size is dependent on the amount of jaw opening and the width of the jaws.
A pallet is a block of steel or more usually cast iron of the order of 400mm square by100mm thick. The sides of the pallets are machined square to known size， and have slots for the holding bolts on the machine table. Pallets are located on the machine table with dowel pins. Pallets are useful for holding components that are heavy or of complex shape， and where positioning of them on the machine table can be a problem.
A subtable is of similar size to a pallet， but in addition the underside of the subtable is machined to a form that can be transferred on to a mating form on the machine. There are machines with rotary six-station automatic work changer. The particular work is selected by the computer in the control unit as required to programmed instructions. Work which has had all the machining operations completed has to be removed manually. The use of subtables is particularly beneficial in flexible manufacturing systems (FMS)， and if the machine is part of a DNC (direct numerical control) system the components are loaded on to the subtables at a work loading station away from the machine.
A fixture can be mounted on pallets or on the work tables. A common application of a fixture is when the components to be machined have bores that have been previously machined. This type of component can be located on a round plug of the requisite size which is clamped to the fixture. The plug can be changed for the different size bores in the work.

Answer 1

你好朋友。你太不会生活了。你以为答题人都是实习生啊，没有材料找材料翻译啊？回答得好还会追加分！-------这句话你怎么解释啊？

Answer 2

请您安装金山快译哈哈

Answer 3

高效操作数控机床，至关重要的是，正确的工具，可在所需的时间。有一些工具，可以改变的安排，主要分为三类：手动，炮塔和杂志。

工作持有人

工作持有人通常使用的是：吸盘；恶习；托盘，子表或装置；和网格板。

有2种类型：三爪夹头和夹头的夹头夹头。卡盘自定心颌骨三常用车削中心，具有保持工作与各种大小。夹头夹头被广泛用于车削中心。个别夹头只能容纳有限的变异大小的工作。夹头夹头举行的工作准确、有效和可编程自动操作的要求。

阶梯式虎钳是一个最简单的方法保持工作，是手动装上钻铣床。一个限制在使用上是最大的大小取决于数额开口的宽度和颌骨。

托盘是一块钢或铸铁更通常的400平方by100mm厚。双方的托盘加工成方形，已知的大小，和有槽保持螺栓的机械表。托盘位于机台桩脚。托盘用于装组件，重或复杂的形状，并在定位他们在机器表可以是一个问题。

一子表是类似大小的托盘，但除了底部的子表是加工的一种形式，可以转移到一个交配型的机器。有旋转六工位自动工作换机器。具体工作由计算机选择的控制单元需要编程指令。工作已经完成所有的加工操作必须手动删除。使用子表是特别有利于在柔性制造系统（柔性制造系统），而如果机器是一个数控（数控）系统的组件被加载到子表在工件装载站从机。

一个灯具可安装在托盘或工作表。一个常见的应用夹具组件时被加工孔，此前已加工。这种类型的组件可以在一个圆插头所需的大小是夹紧的夹具。该插件可以改变为不同大小的孔在工作。