r10 set no: 1 - firstranker.com€¦firstranker code no: r31036 iii b.tech. i semester supplementary...

FirstRanker

Code No: R31036

III B.Tech. I Semester Supplementary Examinations May 2013

METAL CUTTING & MACHINE TOOLS

(Mechanical Engineering)

Time: 3 Hours Max Marks: 75

Answer any FIVE Questions

All Questions carry equal marks

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1. During a metal cutting test under orthogonal conditions it was found that cutting force is 125

kg and feed force is 110 kg when cutting at 170mpm.The rake angle of tool is 100 and shear

plane angle was found to be at 190. Determine i) Shear velocity ii) Chip flow velocity. iii)

Work done per minute in shearing the metal &work done against friction. iv) Show that the

work input is equal to the sum of work done in shearing & against friction.

2. (a) Explain the Apron mechanism with a neat sketch

(b) List out all the taper turning methods and explain any one method with a neat sketch.

3. (a) Differentiate between Shaper and Planer.

(b) Explain the Whitworth Quick return mechanism used in shaper

4. (a) Describe the various operations that can be performed on a drilling machine with neat

sketches.

(b)With a neat sketch explain the working principle & constructional details of Jig boring

machine.

5. (a) Explain the geometry of a milling cutter with a neat sketch.

(b) Obtain the compound indexing for 87 divisions.

6. (a) Explain clearly wheel dressing, truing, glazing and loading related to grinding.

(b) Classify and explain the cylindrical grinders with neat sketches.

7. (a) Explain the principles of Jigs and Fixtures design.

(b)Explain the principle of six point location and principle of mutually perpendicular planes.

8. (a)Describe the working principle and classification of CNC machines.

(b)Explain in detail the constructional features of CNC machines with neat sketches.

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Set No: 1 R10

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FirstRanker

Code No: R31036

III B.Tech. I Semester Supplementary Examinations, May 2013






*****

1. (a) Define the Tool life and explain the factors affecting tool life.

(b) Write a short notes on different types of Tool materials and cutting fluids

2. (a) Describe the work holding devices used on a lathe.

(b)Differentiate between Capstan lathe and Turret lathe.

3. (a) Briefly explain the classification of shapers.

(b) Describe the working mechanism of a planer with a neat sketch.

4. (a) Describe the working principle of a Radial drilling machine.

(b) With a neat sketch explain the principal elements and angles of a Twist drill.

5. (a) Describe the various operations that can be performed on a milling machine with neat

sketches.

(b) Explain how compound indexing of 51 equal divisions can be obtained on a cylindrical

job.

6. (a) What are the various factors to be considered while selecting a grinding wheel? Explain.

(b) Explain lapping, honing and super finishing processes with neat sketches.

7. (a) What are the important considerations in clamp design.

(b) Name various types of milling fixtures and describe broaching fixtures.

8. (a) What are the various types of motion controls used in CNC machines? Explain.

(b) What are the applications of CNC machines? Explain.

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R10 Set No: 2



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Code No: R31036







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1. (a) Describe the significance of Single Point Cutting Tool angles with a neat sketch.

(b) What are the possible reasons of tool failure? Explain in brief.

2. (a) How a lathe can be specified? Describe in brief the various types of lathes.

(b)Derive taper angle equation & explain taper turning method by special attachment.

3. (a) With neat sketches explain the various operations that can be performed on a shaper.

(b) Differentiate between shaper, planer and slotter.

4. (a) Describe the classification of a drilling machine.

(b) Explain the principle, working and specifications of boring machines.

5. (a) Describe the working and constructional features of column & knee type milling machine.

(b) Describe the universal diving head with neat sketch.

6. (a) How do you classify different types of grinding machines? Explain.

(b) Compare grinding with lapping, honing and broaching operations.

7. (a) Explain the principles ‘Least points’ and, ‘Extreme positions’.

(b) List out the types of Fixtures and describe broaching fixtures

8. (a)Discuss the functions of a CNC controller.

(b) What are the advantages of CNC machines over conventional machines?

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R10 Set No: 3



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Code No: R31036







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1. (a) Explain the geometry of a single point cutting tool with neat sketches.

(b) The speed, life relationship for a tool is given by VT1/3

= 200 for a given set of

conditions & time taken to change the tool is 6 min. Show that operating at a speed of 75

mpm gives higher output than operating at either 110 mpm or 50 mpm, if other conditions

remain unchanged.

2. (a) Explain the Tumbler gear mechanism with a neat sketch.

(b) Explain the taper turning by swiveling the compound rest method with a neat sketch.

3. (a) How can you estimate the machining time in shaping, planning & slotting operations?

Explain.

(b) Describe the different types of slotters with neat sketches.

4. (a) What are the various work holding devices used on drilling machines? Explain.

(b) Explain the working principle and constructional details of a deep hole drilling

machine.

5. (a) What are the different operations that can be performed on a milling machine? Explain.

(b) Explain how differential indexing of 119 equal divisions can be obtained on a

cylindrical job.

6. (a) Explain Bonds, Grit, structure and Grade of a grinding wheel.

(b) With a neat sketch explain the construction & working of a Centreless grinding

machine.

7. Describe all the types of actuation of clamping devices in detail.

8. (a) Explain in detail the constructional features of CNC machines with neat sketches.

(b) List out and explain the applications of CNC machines.

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R10 Set No:4



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