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5. Найдите соответствующие ответы на вопросы и напишите их в той последовательности, в которой заданы вопросы:

Вопросы

1. What operations is the engine lathe used for?

2. What are the principal units of the lathe?

3. What units are located on the bed?

4. What is the function of the tailstock?

5. Where are the handles and levers mounted?

Ответы

a. To support one end of the work turned between centres.

b. On the front of the apron.

c. For turning, drilling, screwcutting and others.

d. The headstock, the saddle and the tailstock.

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Самостоятельная работа 15

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V e r t i c a l T u r n i n g M i l l s

1. The single-column vertical turning mills are universal high-speed machines they are designed for roughing and finishing operations on parts made of steel, cast iron and nonferrous metals.

2. The machines are provided with two heads: vertical turret head and horizontal side head. Vertical turret head travels along the horizontal ways of the cross-rail. Horizontal side head moves along the vertical ways of the column.

3. The machine performs the following operations: cylindrical turning, facing, cutting, drilling, etc.

4. High rigidity of machines and their units as well as the wide range of table speeds and work feeds allow machining at most favourable cutting speeds and work feeds.

5. Motion to the table is transmitted from the main drive electric motor by means of V-belt and gearbox.

For starting and stopping the table rotation the gearbox is provided with multidisk friction clutch.