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ENGINE LATHE1. The most versatile machines of the lathe group are engine lathes. They are for metal-cutting operations and for cutting threads. Because of their ability to perform various kinds of work they require a great degree of skill to operate. A worker skilled in the use of a lathe is called a turner.2. Engine lathes vary in size. Thesize of the engine lathe is based upon two measurements – approximate largest diameter that can be revolved over the ways and the total bed.3. The engine lathe is fitted with a carriage and cross-slide for clamping and holding the cutting tool.4. In engine lathe the cutting tools are generally guided by the machine tools itself, in other words, they are operated mechanically, while in some lathes the cutting tools are guided by hand. The engine lathe consists essentially of the fol-lowing basic parts: the bed, the headstock; the tailstock the feed mechanists, and the carriage.5. Ail the principal units are mounted on a bed. The bed has the ways or guides along which the carriage and the tailstock travel. The bed is a strong east-ing which functions as a base for supporting and aligning the rest of the ma-chine.6. The work is damped and rotated by the headstock. The headstock is lo-cated and firmly bolted to the left-hand side of the bed and carries a pair of bear-ings in which the spindle rotates. Many modern lathes have a motor built into the headstock with the spindle serving as the motor shaft.7. The tailstock is located at the right-hand side of the bed. It is a casting carrying a non-rotating sleeve, which can be advanced or retracted by means of the revolving screw. The tailstock may be moved anywhere along the lathe bed and can be damped in place at any point.8. The cutting tool is traversed in both the longitudinal and cross directions, as well as at an angle, by means of the carriage. The carriage consisting of the saddle and apron is the movable part which slides between, the headstock and tailstock.письменно ответьте на вопросы:1. Why do the engine lathes require a great degree of skill?2. Do engine lathes vary in size?3. What measurements is the size of the engine lathe based upon?4. What basic parts does the engine lathe consist of?5. What is the function of the lathe bed?
Ольга
09.12.13
Учеба и наука / Английский язык
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