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

Exercise1. 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:

1) drill	a) устанавливать
2) upright	b) нести
3) to move	c) использовать
4) to carry	d) радиальная траверса
5) to employ	e) вал подачи
6) radial arm	f) сверлильная головка
7) heavy duty machine	g) вертикальный
8) to mount	h) сверло
9) drilling head	i) высокомощный станок
10) feed shaft	j) двигаться
11) clamp	k) длина
12) considerable	l) направляющие
13) length	m) зажимать
14) ways	n) 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.

Text: Drill Presses

Read and translate the text

A drill press.

A drill press (also known as pedestal drill, pillar drill, or bench drill) is a fixed style of drill that may be mounted on a stand or bolted to the floor or workbench. A drill press consists of a base, column (or pillar), table, spindle (or quill), and drill head, usually driven by an induction motor. The head has a set of handles (usually 3) radiating from a central hub that, when turned, move the spindle and chuck vertically, parallel to the axis of the column. The table can be adjusted vertically and is generally moved by a rack and pinion; however, some older models rely on the operator to lift and reclamp the table in position. The table may also from the spindle's axis and in some cases rotated to a position perpendicular to the column. The size of a drill press is typically measured in terms of swing. Swing is defined as twice the throat distance, which is the distance from the center of the spindle to the closest edge of the pillar. For example, a 16-inch (410 mm) drill press will have an 8-inch (200 mm) throat distance.

A drill press has a number of advantages over a hand-held drill:

· less effort is required to apply the drill to the workpiece. The movement of the chuck and spindle is by a lever working on a rack and pinion, which gives the operator considerable mechanical advantage.

· the table allows a vise or clamp to be used to position and restrain the work, making the operation much more secure.

· the angle of the spindle is fixed relative to the table, allowing holes to be drilled accurately and repetitively.

Speed change is achieved by manually moving a belt across a stepped pulley arrangement. Some drill presses add a third stepped pulley to increase the speed range. Modern drill presses can, however, use a variable-speed motor in conjunction with the stepped-pulley system. Some machine shop (tool room) drill presses are equipped with a continuously variable transmission, giving a wide speed range, as well as the ability to change speed while the machine is running.

Drill presses are often used for miscellaneous workshop tasks such as sanding, honing or polishing, by mounting sanding drums, honing wheels and various other rotating accessories in the chuck.

Дата добавления: 2015-07-07