Speaking

Exercise 5. Answer the following questions:

1. What for is a machine tool used?

2. When were the true machine tools born?

3. How can machine tools be powered?

4. How are machine tools powered today?

5. How can machine tools be operated?

6. When was the numerical control (NC) machine developed?

7. What machines became known as computerized numerical control (CNC) machines?

8. What are machining centers?

9. What examples of machine tools can you name?

10. What techniques are used to remove unwanted metal?

Exercise 6. Make up the plan of the text “Machine Tools”.

Exercise 7. Retell the text according to your plan.

Section I. Drill Press

Grammar : Infinitive.

Speaking: Drill Presses. Drill Presses

Study vocabulary:

a drill press – вертикально-сверлильный станок

a stand – станина

workbench – автоматизированное рабочее место, АРМ

a base – основа, основание; базис

column (or pillar) – колонна, стойка (опора)

table – стол (станка)

spindle [‘spindl ] (or quill) – шпиндель (пиноль)

drill head – 1) сверлильная головка 2) шпиндельная бабка сверлильного станка

a set of handles – набор рукояток

a central hub – центральная втулка

chuck – 1) зажимный патрон; держатель (на токарном станке, электродрели) 2) = chuck jaw – кулачки зажимного патрона; magnetic chuck – магнитный зажим

a rack – зубчатая рейка

pinion – шестерня, малое зубчатое колесо пары

swing – поворот

the throat distance – глубина зева

a vise or clamp – зажимное устройство

a stepped pulley arrangement – ступенчатое расположение шкива

miscellaneous – смешанный; разнообразный

sanding – шлифование песком

honing – хонингование

polishing – шлифование, шлифовка

the chuck arbor – хвостовик зажимного патрона

a taper fit – посадка (подгонка) уклона

dislodge – перемещать, передвигать, смещать; удалять, вытеснять

a geared head drill press – станок со шпиндельной бабкой, имеющей зубчатый редуктор

spur gearing – цилиндрическая ЗП (зубчатая передача)

lever – рычаг

a radial arm drill press – (круглопильный) радиально-сверлильный станок

overhead crane or derrick – мостовой кран или различные подъемные приспо­собления

mill drill – фрезерно-сверлильный станок

Exercise 1. Read the following words and wordcombinations, remember them, give Russian equivalents:

drill, drilling machine; drilling head; upright drilling machine; multiple-spindle; radial spindle drilling machine; hole; plane; adapt; to save time; swivel; simultaneous; in addition to; from ... to; adjust; adjustment.

Exercise 2. Pronounce the words correctly:

vary; variety; various; upright; multiple; diameter; brass: bronze; cylindrical; vertical; horizontal; mechanism; mechanical; material; adjust; adjustment; to be classified; simultaneous; worm; delicate; sensitive; provide; considerable.

Exercise 3. Give the Russian equivalents of the following English words and wordcombinations:

worm gear; gear box; suitable gearing; high speed; a wide range of speeds; at a proper speed: feed shaft; mechanical feed; power feed; by hand; by power; a great number of; a lot of; in addition to; because of: by means of: to drill holes; drilling head: at any point; to any point; at any angle; in any position; upright column; workholding device; heavy drilling; a delicate work; the same shaft; feet per minute; rev. per minute; inch per rev.

Exercise 4. Match Russian and English equivalents:

drill	устанавливать
upright	нести
to move	использовать
to carry	радиальная траверса
to employ	вал подачи
radial arm	сверлильная головка
heavy duty machine	вертикальный
to mount	сверло
drilling head	высокомощный станок
feed shaft	двигаться
clamp	длина
considerable	направляющие
length	зажимать
ways	значительный

Exercise 5. Define the form and function of the Infinitive, translate the sentences into Russian:

1. То drill is to remove some metal from the work.

2. A great variety of operations may be performed on the drilling machine.

3. The holes are to be drilled to the size required.

4. The radial drilling machine is used to drill holes in a large, heavy work.

5. To start the spindle one can use either the head or apron control.

6. The machine has a feed mechanism to cut the drill into the work at a proper speed.

7. Provision is made for changing the spindle speeds to use cutters of various diameters.

8. Several cutters may be mounted together on the spindle to machine several surfaces at the same time.

9. The work to be drilled should be damped in a chuck.

10. We know the drilling machines to be used for many metal cutting operations.

11. The drilling machines are known to be employed for drilling holes of different size in metal.

12. The heavy duty drilling machines are said to be used for heavy drilling.