- •Unit 3 turning and turning machines (lathes)
- •1. Read and memorize the following words and word-combinations:
- •Types of lathes
- •1. Give the main points of the text, answering the following questions:
- •2. Choose synonyms out of the following list:
- •3. Fill in the blanks with the suitable words from the text. The words are given below.
- •4. Perform the following tasks, basing of the text.
- •5. Characterize lathes according to the following plan:
- •Text 2 Engine Lathe
- •1. Give the main points of the text, answering the following questions:
- •2. Using the text, give derivatives from the following words and translate them into Russian:
- •3. Replace Russian words and word combinations by the corresponding English equivalents:
- •4. Make up questions to which the italicized words are answers:
- •5. Make up a summary of the text. Text 3
- •Vertical Eight - Spindle Semiautomatics
- •5. Give a brief summary of the text.
- •1. Answer the following questions, using the information from the text:
- •2. Translate the following groups of words, paying attention to the meaning of suffixed:
- •3. Fill in the blanks with the preposition: for, of, in, with, by, out, from, to.
- •4. Find the English equivalents for the following:
- •5. Supply the missing word:
- •Upright Drill Presses
- •1. Underline the suffixes in the following words and state what part of speech they belong to:
- •3. Translate the following sentences observing different meanings of the italicized words and word combinations:
- •4. Guess the meaning:
- •5. Describe the function and characteristics of the principal units of an upright drill press, using the active vocabulary of the text:
- •6. Try to translate the text without using the dictionary:
- •Radial Drills
- •1. Find in the text:
- •2. Find English equivalents:
- •3. Make sentences out of the two parts:
- •4. Translate the following in writing.
- •5. Make a brief summary of the text.
- •Unit 5 grinding and grinding machines
- •Purpose and Field of Application of Grinding Machines
- •Text 2 Cylindrical Grinding Machines
- •6. Summarize the text. Text 3
- •Internal Grinding Machines
- •1. Name the main points of the text answering the following questions:
- •2. Fill in the blanks using the words below:
- •3. Find in the text English equivalents for the following words and word combinations:
- •4. Using the text supply
- •5. Summarize the text.
Text 2 Cylindrical Grinding Machines
Cylindrical Grinding Machines are intended for grinding external cylindrical and tapered surfaces, and are further subdivided into universal and plane types.
In addition to the small table swivel (up to + 6°), universal cylindri2cal grinders also provide for swivelling the workpieces and the grinding wheel by swivelling headstock, wheel head about their vertical axes to a large angle. This enables steep tapers and end faces to be ground in these machines. Universal grinders are usually equipped with an a2dditional head or attachment for grinding holes.
2In a plain cylindrical grinder only the work table can be swivelled through an angle of + 6°. This is use for grinding tapers with a small included angle.
The capacity of a cylindrical grinder is specified by the maximum diameter and length of workpiece that can be accommodated. In the general-pu2rpose grinders, the maximum workpiece diameter ranges from 100 to 1,600 mm, and the maximum length from 150 to 12,500 mm.
Up-to-date cylindrical grinding machines operate on a semiautomatic or automatic cycle and can be efficiently employed for mass, lot and piece production. Many models have provision for installing an automatic in-process size control device. The roughness value of surfaces ground in cylindrical grinders should be within the values stipulated for the 4th and 5th classes after rough grinding, 7th and 8th classes after finish grinding and 8th through 11th classes after precision grinding according to the standards used in our country.
Cylindrical grinders can be employed for:
Traverse and plunge-cut grinding with manual controls;
Traverse grinding to a stop with automatic infeed during table reversal;
Plunge-cut grinding to a positive stop on a semiautomatic operating cycle.
EXERCISES
1. Name the main points of the text answering the following questions:
What are cylindrical grinding machines intended for?
What types of them do you know?
Can you say anything about the construction arrangement of universal cylindrical grinding machines?
How is the capacity of a cylindrical grinder specified?
How do up-to-date grinders operate from the point of view of automation?
What can cylindrical grinders be employed for?
2. Guess the meaning:
It is intended for grinding external cylindrical and tapered surfaces.
It is equipped with an additional attachment for grinding holes.
It is specified by the maximum diameter and length of workpiece that can be accommodated.
It is used for grinding tapers with a small included angle.
3. Find in the text verbs for the following nouns:
subdivision, provision, equipment, swivel, accommodation, operation, installation employment.
4. Underline the suffixes in the following words and state what part of speech they belong to:
cylindrical, subdivided, addition, attachment, automatic, efficiency, roughness, precision, grinder.
5. Choose the definition that fits each word or phrase as it is used in the text:
1. to grind |
2. plain |
a) crush into grains or powder |
a) straightforward, candid |
b) oppress or crush by cruelty |
b) unmistakable, easy to see or hear or understand |
c) sharpen or smooth by friction |
c) not elaborate or intricate, not luxurious, without flavoring |
3. to range |
4. value |
a) vary between limits |
a)the amount of money or other commodity considered to be equivalent to something else |
b) extend, reach |
b) the amount or quantity denoted by a figure etc., |
c) arrange in a row or ranks or in a specified way |
c) desirability, usefulness, importance |