Методические указания и контрольное задание №5 по английскому языку для студентов заочного факультета специальностей 170600, 170700, 120100, 120200. Доржиева Г.Б - 7 стр.

                        Vocabulary list:                              spindles. The cutting tools are held on turrets and tool slides
   1. intermittently(adv) -прерывисто                                 convenient to the cutting locations. Operations are controlled by
   2. rotate(v) - вращаться                                           cams or linkages that position the work, feed the tools, hold
   3. spindle(n) - шпиндель                                           them in position for the proper time, and then retract the tools.
   4. turret(n) - револьверная головка станка                         Finished pieces are automatically separated from the raw stock
   5. cam(n) - тех. кулачок                                           and dropped into a container.
   6. linkage(n) - сцепление                                            5. Bushings, bearings, nuts, bolts, studs, shafts and many
   7. screw – machine(n) – мелкий крепежный винт                      other simple and complex shapes are among the thousands of
   8. bushing(n) – втулка                                             products produced on screw machines. Screw machining is also
   9. bearing(n) - подшипник                                          used to finish shapes produced by other forming and shaping
                                                                      processes.
                         Metal Cutting                                  6. Most materials and their alloys can be machined - some
                                                                      with ease, others with difficulty. Machinability involves three
   1. Cutting is one of the oldest arts practiced in the stone age,   factors: 1. Ease of chip removal. 2. Ease of obtaining a good
but the cutting of metals was not found possible until the 18th       surface finish. 3. Ease of obtaining good tool life.
century, and its detailed study started about a hundred years ago.
   2. Now in every machine-shop you may find many machines            II. а) Point out the questions which you can answer , using the
for working metal parts, these cutting machines are generally              information from the text.
called machine-tools and are extensively used in many branches            б) Answer the questions in written form.
of engineering.
   3. Fundamentally all machine-tools remove metal and can be         1. Why was it impossible to cut metals before the 18-th century?
divided into the following categories:                                2. Where are machine cutting tools applied for?
1. Turning machines (lathes).                                         3. What types of machine-tools are used to produce
2. Drilling machine                                                       large-volume production parts?
3. Boring machines.                                                   4. How are screw-machined parts processed?
4. Milling machines.                                                  5. What workparts are made by means of lathes?
5. Grinding machines.
  Machining of large-volume production parts is best                  III. Read these sentences and arrange them according to the
accomplished by screw machines. These machines can do                      logic of the text.
turning, threading, facing, boring and many other operations.
Machining can produce symmetrical shapes with smooth surfaces         1. Screw machined parts are automatically separated from the
and dimensional accuracies not generally attainable by most               raw stock and dropped into a container.
fabrication methods.                                                  2. Proper study of cutting began three hundred years ago.
   4. Screw-machined parts are made from bar stock or tubing fed      3. Machinability of materials and alloys involves three factors.
intermittently and automatically through rapidly rotating hollow      4. All metal cutting machine-tools are divided into five groups.