R05322401-machine-tools-and-metrology-

Set No. 1

Code No: R05322401

III B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOLS AND METROLOGY (Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Design a gearbox to give speed variation between 100 and 300 rpm in four steps. The driving shaft is to run at a constant speed of 176 rpm. Assume that spindle speeds are in GP. (b) Explain the procedure for designing lathe bed.

[6+10]

2. (a) State the salient features of turret lathe that make it a quantity production machine. (b) List the common tools and attachments used on turret and capstan lathe. [8+8] 3. (a) What are the advantages, limitations and applications of shaper? (b) What are the advantages, limitations and applications of slotter? (c) What are the advantages, limitations and applications of planner?

[5+5+6]

4. (a) What factors contribute to increased production rates in broaching? (b) Explain with sketch different elements of a broach and describe them brief. [8+8] 5. (a) Explain the need for limit system. (b) With the help of a suitable diagrams explain minimum and maximum metal condition of shaft and hole. [8+8] 6. (a) Explain how slip gauges are manufactured. (b) What is ‘Wringing’ ? What precautions must take while Wringing slip gauges? [8+8] 7. Explain the working principle and construction of an auto collimator. What are its applications? [16] 8. (a) Explain the construction and working of free flow air gauges? (b) Explain different pitch errors observed in threads? ⋆⋆⋆⋆⋆

1 of 1

[8+8]

Set No. 2

Code No: R05322401

III B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOLS AND METROLOGY (Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Define taper. How is the amount of taper expressed? (b) Discuss various methods to obtain taper turning in lathe.

[4+12]

2. (a) A plain surface 320mm long ×100mmwide is to be face milled on vertical milling machine. The cutter has 16teeth and the feed/tooth is 0.25mm the spindle speed is 125 rpm; diameter of the cutter is 160mm; over travel distance is 3mm.Calculate the machining time. (b) Show the nomenclatures of face milling cutter with sketch and mention their functions. [8+8] 3. (a) Enumerate the various type of work holding devices used in drilling. (b) Discuses the various type of reamers and their features.

[8+8]

4. (a) What are the various types of surface grinding methods that are possible? (b) What would be their individual advantages and applications? Give explanation for your reasoning. [8+8] 5. What are the different popular ‘Limit systems’ ? Briefly explain the features of Indian Standard limit system and compare it with the I.S.O system. [16] 6. (a) Explain the construction and working of a vernier clinometer. (b) Explain the construction and working of a universal bevel vernier protractor. [8+8] 7. (a) Discuss the method of testing the straightness by spirit level and auto collimator? (b) What is profilometer? Sketch and explain the use of profilometer?

[8+8]

8. (a) Discuss various geometric errors occurring during machining? (b) Describe solex pneumatic comparator? ⋆⋆⋆⋆⋆

1 of 1

[8+8]

Set No. 3

Code No: R05322401

III B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOLS AND METROLOGY (Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What is metal cutting? Differentiate between orthogonal cutting and oblique cutting? Give few examples. (b) How do you classify cutting tools? Mention at least three example of each? [8+8] 2. (a) In turret lathe, prepare a process chart for making square bolt with thread and through hole on head. The hole is normal to the bolt axis. (b) Explain briefly functions of various angles in plain milling cutter.

[8+8]

3. (a) Enumerate the various type of work holding devices used in drilling. (b) Discuses the various type of reamers and their features.

[8+8]

4. (a) What are advantages, limitations and applications of center less grinding? (b) What are important the grinding process parameters? Explain their effect on the grinding performance and the wear rate. [8+8] 5. Describe principal features of the Indian standard system of limits and fits for plain work. [16] 6. (a) Give the classification of angle measuring instruments. (b) What are two standard systems of linear measurement? Explain.

[8+8]

7. List out various optical projectors. Explain the working principle of the optical system of a projector, with the help of a neat sketch? [16] 8. (a) What are the uses and advantages common to all comparators? (b) Explain the system of displacement and amplification used in mechanical comparator? [8+8] ⋆⋆⋆⋆⋆

1 of 1

Set No. 4

Code No: R05322401

III B.Tech Supplimentary Examinations, Aug/Sep 2008 MACHINE TOOLS AND METROLOGY (Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What is chip reduction coefficient? (b) Discuss the effects of cutting variable on the chip reduction coefficient (c) During turning a MS component with a 00 ,100 ,70 ,70 ,80 ,90 -1.5mm shaped orthogonal cutting, a depth of cut 2mm is used. If feed is 0.18mm/rev and chip thickness of 0.36mm is obtained. Calculate chip thickness ratio and shear angle. [4+6+6] 2. (a) What are various methods by which a cam can be cut? (b) Describe the complete setup for cutting a cam on a universal milling machine. [8+8] 3. (a) Describe hydraulic mechanisms in shaper with sketch. (b) What are the advantages of hydraulic mechanisms over crank and slotted link mechanisms in shaper? [8+8] 4. (a) How is the size of broaching machine specified? And explain the terms speed, feed and depth of cut in broaching. (b) What are the advantages, limitations and applications of broaching machine? [8+8] 5. (a) What is a deviation? Explain its importance in the system of limits. (b) Explain the disadvantages associated with trial and error method of assembly. [8+8] 6. (a) Explain the working principle of Clinometers? Give their classification. (b) What are different grades of slip gauges?

[8+8]

7. (a) Describe a method to find out the flatness of surface plate? (b) Explain the symbols used to represent surface roughness?

[8+8]

8. What is the basic principle of working of a mechanical optical comparator? Explain how magnification is obtained in such system. List out the advantages and disadvantages? [16] ⋆⋆⋆⋆⋆

1 of 1