Используйте данные фразы и выражения в собственных предложениях

Bench lathe, turret lathe, to bore, engine lathe, carriage, cross-slide, rigid, bed, change gearbox, to revolve, sleeve, to advance, handwheel, to retract, feed mechanism, feed shaft, to actuate, feed, apron, to swing.

2. Перескажите текст, отвечая на данные вопросы.

1. What is a lathe? 2. What operations may be performed on a lathe? 3. What devices enable grinding and milling operations on a lathe? 4. With respect to what characteristic features are lathes classified? 5. What types of lathes are mentioned in the text? 6. What kind of work is the bench lathe intended for? 7. What are turret lathes? 8.Why are some lathes termed chucking lathes? 9. What are automatic lathes? 10. What lathes belong to special-purpose lathes? 11. What basic parts does the engine lathe consist of? 12. What is the function of the lathe bed? 13. What is the upper surface of the bed provided with? 14. What do the bed ways serve for? 15. Which side of the bed is the headstock bolted to? 16. What does the change gearbox serve for? 17. What is the tailstock and where is it located? 18. Which bed ways does the tailstock slide along?

3. Выберите группу антонимов из ниже приведённого списка.

Dead centre, alignment, regular, right feed, fasten, disalignment, irregular, left feed, easy, to prohibit, unfasten, live centre, difficult, to permit.

4. Измените предложения, используя номинативную конструкцию.

Например: It is known that the lathe is the most important machine tool used for machining surfaces of a workpiece.

The lathe is known to be the most important machining surfaces of a work piece.

1. It is known that the lathe is regularly furnished with a multiple disc clutch and brake incorporated in a driving pulley. 2. It is intended that the compound rest slide is actuated by a screw rotating in a nut fixed to the saddle. 3. It is known that the headstock and the tailstock are fastened at opposite ends of the lathe bed. 4. It was said that the independent chuck had been suitable for almost any type of work. 5. It seems that this new feed mechanism is simple and easy to operate. 6. It proved that the functions of the new lathe were fully automatic. 7. It was evident that the engine lathe has been widely used for metal-turning operations.

5. Задайте вопросы к выделенным курсивом словам.

1. The lathe is a machine tool for machining surfaces of a round work piece. 2. The tailstock of a lathe rests on a saddle. 3. The lathes are generally furnished withbrakes. 4. To start the spindle one can use either the head or apron control. 5. The cross-slide is mounted on the carriage. 6. The tool holder is clamped by the tool post screw. 7. The feed mechanism comprises a cone of gears, an intermediateshaft and a set of sliding gears. 8. The change shifter slides on a splinted shaft and carries a tumbler gear.

Date: 2015-12-13; view: 612; Нарушение авторских прав