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poor machining – погана токарна обробка
spur gear – циліндрична шестірня
helical gear – гелікоїдна зубчаста передача
herringbone gear – шевронне зубчасте колесо
bevel gear – конічна зубчаста передача
spiral gear – шестірня із спіральними зубцями(включаючи
гіпоідну передачу)
worm gear – черв’ячна передача
rack and pinion – механізм рейкової передачі

Exercises

Exercise 1. Answer the following questions
1. What advantages of roller chain drives can you mention?
2. When does the lubrication of roller chain become critical?
3. How should the chain be kept?
4. What is the difference between the roller and silent
chains?
5. What are the troubles with silent chains?
6. What are V-belt drives used for?
7. Why are V-belts often used on portable packages?
8. How are V-belts driven?
9. What types of gears do you know?
10. What types of gears are most commonly used in modern
drilling equipment?
11. What recommendations of the manufacturer should be
followed closely?

Exercise 2. Translate the following sentences into
Ukrainian paying special attention to the terminology
1. Two typical applications of roller chain are seen in Fig.
where a double strand of 2-in. pitch chain is used as a cat shaft
drive within a selective transmission and a single strand of
motorcycle-size chain is used to drive a lubrication pump.

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