1. Name the main points of the text answering the following questions:

1. What are internal grinders intended for?

2. What is the principal dimension of an internal grinder?

3. How are internal grinders classified from the point of view of spindle arrangement?

4. What other classifications of internal grinders do you know?

5. What is the primary cutting motion in internal grinders?

6. Can you name the working motions in internal grinders?

7. What mechanisms are found in both chucking and planetary machines?

8. What types of grinding wheel drive do you know? can you characterize each of them?

2. Fill in the blanks using the words below:

1. The principal ... of an internal grinder is the maximum diameter of the ... ground.

2. Depending on whether the work ... or remains ... internal grinders are classified as ordinary and planetary machines.

3. In internal grinders the ... can be driven by various methods.

4. One disadvantage of a ... ... is its lack of flat speed characteristics.

5. ... ... can also be used for powering the wheel in internal grinders.

6. Electrical grinding spindles are widely ... in recent years.

Employed, rotates, pneumatic drive, hole, grinding wheel, stationary, dimension, hydraulic drives.

3. Find in the text English equivalents for the following words and word combinations:

Чистовая обработка поверхности, основной параметр, шлифовальная бабка, неправильная форма, приводить в действие, отсутствие, неприятный шум, встроенный, станок средних размеров, недостаток, неподвижный, рабочие движения

4. Using the text supply

a) synonyms for the following words: disadvantage, blank, obtain, capability, apart from, velocity, absence, usage, permit.

b) antonyms for the following words: silence, smoothness, external, regular, small, pleasant, unlimited.

5. Summarize the text.

DISCUSSION

Working in pairs role-play the following situations:

1. You are going to carry out research using grinding machines. Ask your teacher which one is more suitable for your work and why.

2. Your friend knows little about grinding machines. He asks you questions about different types of them. Tell him all you know.

FINAL TEST

1. Choose the sentences which are true to the information of Text 1 (Выберите предложения, соответствующие информации текста 1):

A. Grinding machines are employed chiefly for rough machining operations.

B. Grinding machines produce a very high class of accuracy.

C. Sharpening all types of cutting tools can be performed on grinding machines.

D. There exist general- and single-purpose grinding machines.

E. The accuracy of surface machining doesn’t depend upon the type of operation.

2. Choose the right Russian equivalent to the following English sentence (Выберите верный русский эквивалент следующему английскому предложению):

The capacity of a cylindrical grinder is specified by the maximum diameter and length of workpiece that can be accommodated.

A. Мощность круглошлифовального станка не зависит от максимального диаметра и длины заготовки, размещаемой на станке.

B. Мощность круглошлифовального станка зависит от максимального диаметра и длины заготовки, которую можно разместить на станке.

C. Мощность круглошлифовального станка меняется максимальным диаметром и длиной заготовки, которую можно разместить на станке.