Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
Book_Eng T, M.doc
Скачиваний:
0
Добавлен:
01.07.2025
Размер:
3 Мб
Скачать
☆

9) The main types of metal lathes

There are many types and variations of the metal lathe today, each designed for a particular function and/or tolerance. Some of the more common types of lathes are: the center lathe which is the simplest of lathes as well as the largest; the bench lathe that is usually small enough to be mounted on a workbench; the turret lathe which allows multiple bits to be simultaneously engaged. Other less versatile lathes that are used for more specialized operations include the engine lathe, the tool room lathe, the capstan lathe and the multi-spindle lathe.

Computer technology has given the metal lathe a huge range of versatility, economy and ease of operation. The CNC lathe, a computer-operated machine, allows an operator to simply program a particular function of the machining process. With the press of a button, the CNC lathe will automatically set the proper speed of the spindle rotation and engage the designated number of machining bits at precisely the right angle and depth. Today, the CNC lathe is the most commonly used metal lathe.

I. Copy the underlined words and word-combinations, translate them into Ukrainian and learn them.

II. Find the following words and word-combinations in English in the text: центровий токарний верстат; найпростіший та найбільший з токарних верстатів; настільний токарний верстат; токарно-револьверний верстат; менш універсальні токарні верстати; токарно-гвинторізний верстат; верстат для інструментальних робіт; токарно-револьверний верстат з поздовжніми полозками на револьверному супорті; багатошпиндельний токарний верстат; легкість керування; токарний верстат з ЧПК типу CNC; натискання кнопки; встановлювати потрібну швидкість обертання шпинделя; правильний кут та глибина.

Test yourself:

1. Choose the right variant.

1. Machine tools are powered mechanical devices that are generally used…

a) to make manufactured parts (components) in various ways that include cutting or certain other kinds of deformation.

b) to manufacture metal components of machines by selectively cutting and removing metal.

c) for cutting, shaping, and finishing metals or other materials.

d) all of the mentioned above.

2. Today, machine-tools are powered by electricity and can be operated…

a) manually.

b) under automatic control.

c) manually, or under automatic control.

3. Drilling machines are used…

a) to cut internal cylinders into metal parts.

b) for drilling holes up to several inches in diameter or several feet deep.

c) for boring holes, having a stand and work table with facilities for lowering the tool to the workpiece.

d) all of the mentioned above.

4. Lathes are versatile machine tools…

a) especially adapted for reducing the outside diameters of cylindrical work.

b) which perform an operation called turning.

c) capable of drilling, boring, thread cutting, and other operations.

d) all of the mentioned above.

5. The lathe is…

a) a machine tool used principally for shaping pieces of metal by causing the workpiece to be held and rotated by the lathe while a tool bit is advanced into the work causing the cutting action.

b) a machine in which work is rotated about a horizontal axis and shaped by a fixed tool.

c) a machine for shaping wood, metal etc, which turns the piece of wood etc which is to be shaped round and round against a tool held steady by the operator.

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]