Rr320303-machine-tools

Set No. 1

Code No: RR320303

III B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOLS (Mechanical 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.

[8] [8]

2. (a) Describe the internal mechanism of cone-pulley type headstock of a Lathe showing location of different parts. [8] (b) What is an “all geared head stock”? Describe briefly.

[8]

3. (a) What is the significance of capstan, turret and automatic lathes in production shop? [8] (b) Compare the merits and demerits of turret and capstan lathe with engine lathe. [8] 4. (a) Explain the working of a hydraulic quick return mechanism of a shaper.

[8]

(b) Sketch and describe the working of automatic table feed mechanism of shaper [8] 5. (a) Define the process drilling. Give classification of various drilling machines [8] (b) Explain with a neat sketch the construction and working principle of a radial drilling machine [8] 6. Describe the set up that can be used for milling cams in a milling machine. Explain neatly with a sketch, the various attachments that one needs to use for such milling. Explain the limitations of such a set up. [16] 7. (a) List the various types of special grinding machines.

[8]

(b) Classify and explain the various centre type cylindrical grinding machine. [8] 8. (a) What do you understand by location of a piece and what are the important principles of location and the type of locations commonly used? [8] (b) What do you understand by principle of least points and principle of least positions [8] ⋆⋆⋆⋆⋆

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Set No. 2

Code No: RR320303

III B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOLS (Mechanical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Why tool wear is important in metal cutting? (b) Discuss various types of tool wear. 2. (a) Describe briefly about taper turning methods?

[6] [10] [8]

(b) What are the different types of Lathe attachments? Discuss them briefly. [8] 3. Write briefly about following holders used in capstan and turret lathes. [4x4=16] (a) Multiple cutter holder (b) Slide tool holder (c) Knee tool holder (d) Drill tool holder 4. (a) What are various operations performed on shaper? Explain in detail (b) Describe constructional features of speed gearbox of slotter? 5. (a) Enumerate the uses and limitations of the following drilling machine

[8] [8] [9]

i. Sensitive drilling machine ii. Pillar drilling machine iii. Radial drilling machine (b) Explain what is meant by spot facing?

[7]

6. Explain clearly with neat sketch the various types of milling cutters and state their advantages and applications. [16] 7. (a) List the various types of special grinding machines.

[8]

(b) Classify and explain the various centre type cylindrical grinding machine. [8] 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. 3

Code No: RR320303

III B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOLS (Mechanical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Which are two popular metal cutting theories? Describe them.

[8]

(b) With suitable diagram, derive expression for finding shear velocity and chip flow velocity if cutting velocity ,shear angle and rake angle are known. [8] 2. Give neat diagram of engine lathe, and describe its main parts and controls. [16] 3. (a) What is meant by tool layout? Expalin briefly

[8]

(b) Describe in brief the types of head stocks used on semi automatic and automatic machines. [8] 4. (a) What is planer? Illustrate and describe its working principle. (b) Give detailed classification of planer machines. 5. (a) How a drilling machine is specified? (b) Define and write the formulae of the following for a drilling machine

[8] [8] [4] [12]

i. Cutting speed ii. Feed iii. Machining time in drilling 6. Explain clearly with neat sketch the various types of milling cutters and state their advantages and applications. [16] 7. (a) What is the marking system followed in case of grinding wheels? Explain the individual elements of the marking system from the stand point of the functioning of the wheel. [10] (b) Describe vitrified shellac, and resinoid bonds. 8. (a) Explain the different teeth in a broaching tool. (b) Explain clearly the advantages and limitations of Broaching. ⋆⋆⋆⋆⋆

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[6] [8] [8]

Set No. 4

Code No: RR320303

III B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOLS (Mechanical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Enumerate the factors on which tool wear and tool life depend.

[8]

(b) What are essential characteristics of cutting fluid?

[8]

2. (a) What are the different types of taper turning attachments attached to lathed? Discuss them briefly. [8] (b) Classify the Lathe machines and explain their important advantages.

[8]

3. What is Swiss automatic screw machine? How it functions and what are its main applications? [16] 4. (a) Differentiate slotter and vertical shaper?

[6]

(b) Describe constructional features of speed gearbox of planer?

[10]

5. (a) How a drilling machine is specified?

[4]

(b) Define and write the formulae of the following for a drilling machine

[12]

i. Cutting speed ii. Feed iii. Machining time in drilling 6. What are the various work holding devices used in milling? Explain their relative applications and disadvantages. [16] 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. Explain the following clearly

[8x2=16]

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

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