Exercises. I. Use the following words and phrases in sentences of your own:

I. Use the following words and phrases in sentences of your own:

thread, to classify, female screw-cutting tools, nut tap, to tap, threading die, die holder, tap wrench, male threads, female threads

II. Retell the text giving answers to the following questions:

1. What are thread-cutting tools? 2. How are thread-cutting tools classified according to the work done by them? 3. How are thread-cutting tools classified according to their construction? 4. What instrument is used for cutting threads? 5. What is the construction of a tap? 6. How can threads be cut? 7. What is needed for manual tapping? 8. What is the purpose of the first, second and third tap? 9. How should the tap be set before cutting threads and why is it necessary to do that? 10. What instrument is used for cutting male threads?

III. Supply synonyms for the following words:

to perform, female thread, male thread, construction, instrument, form

IV. Give derivatives from the following words and translate them into Russian:

to operate, to perform, to cut, to construct, to thread, to tap, to fasten, usual, to hold

V. Supply antonyms for the following words:

straight grooves, manual tapping, final, to coincide

VI. Translate the following sentences observing different meanings of the word machine:

1. This machine is mainly used for removing large pieces of metal. 2. The engineer explained in his lecture how to machine workpieces of different shapes and sizes. 3. The size and shape of all machine parts should be checked by means of different measuring tools.

VII. Make up questions to which the italicized words are the answers;

1. With mechanical tapping in cast iron, bronze, brass, copper, and aluminium one tap is used. 2. When steel is tapped a set of two tools is used. 3.Before cutting threads the tap should be firmly set in a tap wrench. 4. A threading die is made of internally threaded flat steel stock.

VIII. Describe Figs 28 and 24 orally using the following words and word combinations:

the tap, to be made, a cylindrical bar stock, to consist, the working part, the shank, to be used, fastening the threading tool, in a chuck or in a tap wrench, two or three taps, to be applied, manual tapping, the first and the second taps, to serve, to cut threads, the third tap, final thread cutting

IX. Giving answers to the following questions describe the threading die shown in Fig. 25:

1. What operations are performed with a threading die? 2. What material is a threading die made of? 3. How is a threading die threaded? 4. What is there between the cutting grooves of a threading die?

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