Rr222002-machine-tool-engineering

Set No. 1

Code No: RR222002

II B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOL ENGINEERING (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain briefly about chip breakers. (b) Explain essential requirements of tool material. 2. (a) Derive an expression for determining the machining time on lathe.

[8] [8] [8]

(b) Find the time required for one complete cut on a piece of work 350mm long and 50mm in diameter. The cutting speed is 35meters per minute and the feed is 0.5 mm per rev. [8] 3. (a) What are the differences between a capstan lathe and turret lathe?

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(b) Explain with help of suitable sketches, different tool holders used in turret lathe. [10] 4. (a) What is planer? Illustrate and describe its working principle. (b) Give detailed classification of planer machines.

[8] [8]

5. (a) Why must drills or reamers with more cutting edges be employed for enlarging holes? [5] (b) What do you understand by oil hole drill? What is meant by trepanning a hole? [6] (c) What type of hole results if the point angle of a twist drill is unsymmetrical with the axis? [5] 6. (a) What are the differences between bed type and planar type milling machine. [8] (b) List the various precautions in use of milling cutters. 7. Write a short note on the following

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(a) Brazed carbide tools (b) Grade of grinding wheel (c) Geometry of a single point turning tool (d) Surface grinding machines 8. (a) How a broaching machine is specified?

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(b) Why robust fixtures are required to support jobs to be broached?

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(c) How much stock is removed by tooth on a broach?

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Set No. 1

Code No: RR222002 (d) How the length of a broach is determined? ⋆⋆⋆⋆⋆

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Set No. 2

Code No: RR222002

II B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOL ENGINEERING (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What do you understand by tool life? [6] (b) In the orthogonal cutting turning of 50mm dia mild steel bar on a lathe the 1 following data was obtained : rake angle =15deg, cutting speed 100m/min, feed 0.2mm/rev, cutting force = 180kg, feed force = 60kg. Caluculate shear plane angle, coefficient of friction, cutting power, the chip flow velocity and shear force. Chip thickness is 0.3 mm. [10] 2. Write briefly about following (a) (b) (c) (d)

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Face plate Angle plate Lathe carriers Lathe centers

3. What is Swiss automatic screw machine? How it functions and what are its main applications? [16] 4. What are various work holding devices used in shaper? Discuss them with help of neat sketches. [16] 5. (a) Enumerate the uses and limitations of the following drilling machine i. Sensitive drilling machine ii. Pillar drilling machine iii. Radial drilling machine (b) Explain what is meant by spot facing?

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6. (a) What are the differences between bed type and planar type milling machine. [8] (b) List the various precautions in use of milling cutters. [8] 7. Describe in detail the various arrangements of centreless grinding with neat sketches. Mention the applications in each case. [16] 8. Explain the following clearly

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(a) Cylindrical super finishing (b) Flat and Spherical super finishing ⋆⋆⋆⋆⋆ 1 of 1

Set No. 3

Code No: RR222002

II B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOL ENGINEERING (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Describe basic elements of machining. (b) Explain briefly mechanics of chip formation. 2. Write short notes on the following

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(a) Lathe carriage (b) Cross slide (c) Tool post (d) Compound rest 3. (a) What is turret saddle? Describe its function in brief? (b) How are sizes of capstan and turret lathes specified? 4. (a) Differentiate slotter and vertical shaper? (b) Describe constructional features of speed gearbox of planer? 5. (a) Differentiate between taper, plug and bottoming taps.

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(b) What is the function of a tap drill?

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(c) Why are drilled holes superior to punched holes in vessel work?

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6. (a) Explain clearly what is meant by milling.

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(b) Give a brief classification of various milling machines used in the industry giving a brief note on the application. [10] 7. (a) What is the classification method that could be used for grinding machines? Give the application of each variety of grinding machines. [10] (b) Explain the correct transverse setting for an external cylindrical grinding operation showing the relationship of the wheel and the work. [6] 8. (a) What is lapping? What are its advantages? (b) Write a brief note on the following i. Equalising lapping ii. Form lapping. ⋆⋆⋆⋆⋆

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[6] [10]

Set No. 4

Code No: RR222002

II B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOL ENGINEERING (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain briefly about chip breakers. (b) Explain essential requirements of tool material.

[8] [8]

2. (a) Explain, with the help of neat sketch, the working principle of Lathe machine. [12] (b) How is size of lathe specified? [4] 3. (a) Write briefly about indexing of turret and cross slides. (b) Discuss the applications of capstan and turret lathes.

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4. (a) Write briefly about ram mechanisms used in slotter? (b) Describe constructional features of feed gearbox of planer?

[8] [8]

5. (a) How a drilling machine is specified? (b) Define and write the formulae of the following for a drilling machine i. Cutting speed ii. Feed iii. Machining time in drilling

[4] [12]

6. (a) Explain the applications and differences with neat sketches, the following with reference to milling: [10] i. Straddle milling ii. Gang milling (b) Sketch typical set up for [6] i. Reciprocal milling ii. String milling 7. Write a brief note on the following (a) (b) (c) (d)

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Super finishing Cylindrical super finishing Flat and Spherical super finishing Polishing

8. (a) Explain briefly the cutting action of a broach. (b) Describe the continuous type broaching machine . ⋆⋆⋆⋆⋆ 1 of 1

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