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X. Translate the sentences into English using your active vocabulary.

1. Вони виконали ряд операцій на токарному верстаті до того, як закінчились лабораторні заняття.

2. Вчора до 5 години вечора фрезерний верстат було відремонтовано.

3. Зразки багатоцільових верстатів були виготовлені до того, як розпочався експеримент.

4. Стаття буде опублікована до початку конференції.

5. Один верстат з централізованим програмним управлінням контролює роботу більше ста різних різальних інстру­ментів.

6. Коробки передач виготовляються на призматичних верстатах.

Reading and Speaking

I. Learn to read the following words. Say which of them are international.

component, category, prismatic, hollow, casing.

II. Analyse the following word combinations and translate them into Ukrainian.

machine tools, machine tool types, mechanical engineering workshop, metal cutting machines.

III. What is the difference between a hand tool and a machine tool? Look through the first passage of the text to find it out.

IV. There exists a great number of machine tools that can be used by engineers in their work. Read the text about different types of machine tools for more information.

Scientists consider that the oldest tools that are known to the mankind are 2,600,000 years old. They were used by people in manual operations and that is why they were called hand tools. By the begin­ning of the Industrial Revolution people had already devised simple hand tools for cutting and shaping different materials. But in the 18th century there appeared machine tools that made mass produc­tion a reality in the 19th century. A machine tool is a power-driven machine that is used to perform different operations with metal or other material. Basic machine tools use mechanical power to bend, cut, drill, grind and hammer metal into desired shapes. More advanced machine tools use such power sources as electrical or chemical energy, heat, magnetism and ultrasound.

Nowadays machine tools play an important role in the manufac­ture of almost all metal products. Machinists (people who operate machine tools) use them in making automobiles, radios, refrigerators, television sets and so on. Every mechanical engineering workshop is equipped with machine tools. They are the main source for the manu­facture of component parts of all machines and mechanical devices.

There are about 500 kinds of machine tools. Some perform a sin­gle operation, such as grinding or drilling. Others, called machining centres, carry out several kinds of tasks. These numerous machine tool types fall into two categories. The first group is called "metal cutting". The machine tools of this group remove some material . from the workpiece and they are much stronger than the workpiece itself. The examples of metal cutting machines are lathes, drill presses, milling and shaping machines.

The second group is called "metal forming". They shape the work­piece without the removal of any material from it. For metal forming operations we use a wide range of forging machines (ковочна машина), presses and press brakes (пресові гальма).

V. Answer the following questions.

1. What is a machine tool?

2. Where do we use machines tools?

3. How many machine tools are used in industry nowadays?

4. What are the two main types of machine tools?

5. Is there any difference between the first and the second group of machine tools?

VI. Say if the following sentences are true or false. Correct the false ones.

1. The first hand tool was used during the Industrial Revolution of the 18th century.

2. Machine tools never use such power sources as heat and chemical energy.

3. Machinists are the people who operate machine tools.

4. Machining centres perform a single operation, for example, drilling.

5. A lathe is an example of metal forming machines.

VII. Complete the text using the diagram.

This diagram shows the subdivision of metal-cutting machines. This subdivision may be made between … and … machines. Cylindrical machines produce …,…, and … may be said as the best known machine tools of this type. Prismatic machines produce … and … and … machines may be said as the best known machine tools of this type.

VIII. a) You are going to deliver a lecture to the students of metallurgy on different types of machine tools. Make an outline of your lecture (maxi­mum 10 sentences)

b) Give the lecture to the students. Be ready to answer their ques­tions.

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