Machine Tools Rr320303

Set No. 1

Code No: RR320303

III B.Tech II Semester Regular Examinations, Apr/May 2007 MACHINE TOOLS (Mechanical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Draw a merchant circle and derive expressions to show relationships among different forces acting on cutting tool. [16] 2. (a) Give in detail classification of lathe. (b) Why lathe beds are made of cast iron? Explain.

[12] [4]

3. (a) Discuss the different operations that can be performed on turret and capstan lathe operations? [8] (b) Write briefly about tooling layout of automatic lathes? 4. (a) What are various operations performed on shaper? Explain in detail (b) Describe constructional features of speed gearbox of slotter?

[8] [8] [8]

5. (a) Write a brief note on the various work holding devices of a drilling machine [7] (b) Describe the following types of drills in brief

[9]

i. Core drill ii. Multi diameter drill iii. Chip breaker drill 6. (a) Briefly explain some of the problems caused in milling, their causes and probable remedies. [8] (b) Derive the expression for the area of cross section of the chip in slab milling Ignore the direction of cut. [8] 7. (a) What are the advantages and limitations of using centreless grinding? (b) Describe the dressing and balancing requirements in grinding. 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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[8] [8] [6] [10]

Set No. 2

Code No: RR320303

III B.Tech II Semester Regular Examinations, Apr/May 2007 MACHINE TOOLS (Mechanical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Derive an expression for optimum value of cutting speed.

[8]

(b) While machining a mild steel bar with H.S.S tool the Cutting speed is 32m/min, tool life is 50 min, If cutting speed is increased by 50%, how tool life is affected. Take n=0.2. [8] 2. (a) Describe different types of the tool posts used in lathe.

[8]

(b) Sketch and describe different types of tool holders

[8]

3. What are multi spindle automatic lathes? Discuss any one type of multiple spindle automatic lathe with the help of neat sketch. [16] 4. (a) How is shaping machine specified? (b) Describe with help of neat sketch, principal parts of shaper? 5. (a) Explain the following

[4] [12] [8]

i. Counter boring ii. Counter sinking (b) A hole of 40mm diameter and 50mm depth is to be drilled in a mild steel component.The cutting speed can be taken as 65m/min and the feed rate as 0.25mm/rev. Calculate the machining time and material removal rate. [8] 6. (a) What are the various types of milling cutters that are used in milling?

[8]

(b) Describe the application and relative merits of various types of milling cutters that are used in milling. [8] 7. (a) Mention the various types of bonds used in the making of grinding wheels. Also mention their applications. [8] (b) Write a short note on the following

[8]

i. Lapping process ii. Structure of a grinding wheel 8. (a) What are the elements of Jigs and Fixture and explain briefly. (b) State the differences in the function and design of Jigs and Fixtures. ⋆⋆⋆⋆⋆

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[8] [8]

Set No. 3

Code No: RR320303

III B.Tech II Semester Regular Examinations, Apr/May 2007 MACHINE TOOLS (Mechanical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Draw a merchant circle and derive expressions to show relationships among different forces acting on cutting tool. [16] 2. (a) Describe briefly about taper turning methods?

[8]

(b) What are the different types of Lathe attachments? Discuss them briefly. [8] 3. (a) What is meant by tool layout of a turret lathe? Discuss

[8]

(b) Enumerate various rules, which must be followed while laying out sequence of operations for a turret lathe. [8] 4. (a) With help of neat sketch describe main parts of slotter. (b) How is slotter machine is specified? Explain

[10] [6]

5. What are different types of drills used?Explain the function of each type of drill [16] 6. (a) Explain the characteristics that distinguish a milling process from other machining processes. [8] (b) Describe the differences between a lathe and milling machine in terms of the types of surfaces generated , the types of tools used and applicability for general and production applications. [8] 7. (a) Explain how the surface finish of carbide turning tools can be improved by grinding. [8] (b) Explain the process of wear of a grinding wheel.

[8]

8. (a) What do you understand by fool-proofing in connection with locating principles for jigs and fixtures? [8] (b) What are the advantages of locating a piece against an inclined surface compared to particular plane? [8] ⋆⋆⋆⋆⋆

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Set No. 4

Code No: RR320303

III B.Tech II Semester Regular Examinations, Apr/May 2007 MACHINE TOOLS (Mechanical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What are functions of a cutting fluid?

[8]

(b) Discus Taylor's relationship for cutting speed tool life.

[8]

2. (a) Describe different types of the tool posts used in lathe.

[8]

(b) Sketch and describe different types of tool holders

[8]

3. Describe briefly about following holders used in capstan lathe.

[4x4=16]

(a) Knurling tool holder (b) Tap holder (c) Recessing tool holder (d) V-steady box tool holder 4. (a) Describe working and construction of crank quick return mechanism of a 8m shaper? [10] (b) How will you adjust the length of stroke and ram position in shaper? 5. (a) Explain clearly what is meant by Jig boring.

[6] [8]

(b) Explain clearly about the hole location procedure in drilling and boring operations. [8] 6. (a) What are the various types of milling cutters that are used in milling?

[8]

(b) Describe the application and relative merits of various types of milling cutters that are used in milling. [8] 7. (a) Grinding wheel characteristics or the performance of a grinding wheel depends on type of abrasive grain size, structure and bonding material. Discuss the effect of each [6] (b) Describe a grinding wheel structure with the help of a neat sketch and state different abrasive materials used in it. [10] 8. (a) How a broaching machine is specified?

[3]

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

[4]

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

[4]

(d) How the length of a broach is determined?

[5]

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