Rr322402-machine-tools-and-metrology

Set No. 1

Code No: RR322402

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 various tool angles used in single point cutting tool with neat sketch [8] (b) Explain importance and functions of different tool angles and other parameters associated with a single point cutting tool. [8] 2. (a) Discuss the different types of box tools. (b) Describe constructional features of feed gearbox of machine tools? 3. (a) Write in detail about operations performed by planer (b) Describe constructional features of feed gearbox of slotter?

[8] [8] [6] [10]

4. (a) Explain the various operations that can be performed on a drilling machine [8] (b) Write a brief note a vertical boring mill.

[8]

5. (a) Define terms: Basic hole; Basic shaft ; Tolerance zone; Tolerance grade. Draw a conventional diagram of shaft and hole pair for explicit representation of these terms. (b) The hole and shaft assembly of 60mm nominal size have tolerances specified +0.06 as 60+0.04 −0.00 mm for hole and 60+0.04 mm for shaft. Determine i. ii. iii. iv. v. vi.

Maximum and minimum clearance (interference) attainable Allowance Hole and shaft tolerances Fundamental deviation MML for shaft and hole Type of fit. Sketch these values on a conventional diagram.

[8+8]

6. (a) What is wringing ? What is wringing of slip gauges ? What are uses of slip gauges? (b) What are the advantages and limitations of good dial indicators?

[8+8]

7. (a) Describe the working principle of tool markers microscope. What are its uses (b) Explicate the utility of straight edge and surface plate in laboratories. [10+6] 8. (a) What are various orders of geometrical irregularities on surfaces ? How these are classified? 1 of 2

Set No. 1

Code No: RR322402

(b) Describe with a neat sketch the construction , principle and operation of Tomlinson surface meter. [6+10] ⋆⋆⋆⋆⋆

2 of 2

Set No. 2

Code No: RR322402

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 various tool angles used in single point cutting tool with neat sketch [8] (b) Explain importance and functions of different tool angles and other parameters associated with a single point cutting tool. [8] 2. (a) What is turret saddle? Describe its function in brief? (b) How are sizes of capstan and turret lathes specified?

[8] [8]

3. (a) Draw a block diagram of standard double housing planer, showing its main parts and briefly describe these parts. [12] (b) How is planer specified?

[4]

4. (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.

[6]

5. (a) Explain terms: Maximum metal limit; minimum metal limit; tolerance and allowance. Draw a conventional diagram to represent these terms for a shaft and hole of clearance fit. (b) For each of the following shaft and hole pair, calculate shaft tolerance, hole tolerance and analyze whether the pair is i. Clearance fit ii. Transition fit iii. Interference fit. Pair 1: Hole:- 60+0.26 +0.00 mm Pair 2: Hole:- 60+0.06 +0.00 mm Pair 3: Hole:- 60+0.04 +0.00 mm Sketch the three fits.

Shaft:- 60+0.06 +0.006 mm Shaft:- 60−0.02 +0.05 mm Shaft:- 60+0.08 +0.06 mm [8+8]

6. (a) Describe the features, advantages and limitations of i. Digital micrometer ii. Bench micrometer iii. Telescopic gauge (b) Describe with sketch i. Imperial standard yard 1 of 2

Set No. 2

Code No: RR322402 ii. International prototype meter

[10+6]

7. What are the numerous fringe contours in checking slip gauges by means of optical flats? Describe the method of experimental testing of such surfaces. [16] 8. (a) Enumerate the basic differences between electrical and mechanical comparators. (b) Explicate the working principle of i. electronic comparator ii. pneumatic comparator

[6+10] ⋆⋆⋆⋆⋆

2 of 2

Set No. 3

Code No: RR322402

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) Explain terms speed, feed and depth of cut as applicable in metal cutting. [6] (b) What are various sources of heat generation in metal cutting? Explain. [10] 2. (a) Explain briefly about thread cutting methods. [8] (b) Why back gear is used in lathe? Describe in detail the method of using them. [8] 3. Explain with the help of a line diagram the construction and working principle of a vertical milling machine. State the advantages and disadvantages along with application. [16] 4. (a) Explain with neat sketches the constructional features of a twist drill and label the important features [10] (b) What is the function of a drill Jig?What provisions it must include? [6] 5. (a) Explicate the classification of various fit. Also provide on a single diagram, The explicit representation of all fits with common zero line. (b) A hole and mating shaft are to have a nominal assembly size a minimum assembly size of 50mm. The assembly is to have a maximum clearance of 0.15mm and a minimum clearance of 0.05mm. The hole tolerance is 1.5 times the shaft tolerance. Determine the limits for both hole and shaft: by using i. Hole basis system ii. Shaft basis system. [8+8] 6. (a) Explicate i. pilot plug gauge ii. progressive plug gauge iii. double ended plug gauge with sketches. (b) Design and sketch suitable GO and NO-GO plug gauges of ‘progressive type’ for checking a bored hole of 45.009 mm diameter. [6+10] 45.000 7. Enumerate different variants of Toolmakers microscope. Explain the working principle of its basic type. [16] 8. (a) Differentiate between surface roughness and waviness. (b) What are different methods of surface finish measurement with reference to inspection by comparison. Explain any one method. [6+10] ⋆⋆⋆⋆⋆ 1 of 1

Set No. 4

Code No: RR322402

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) 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. (a) Explain briefly about thread cutting methods.

[8]

(b) Why back gear is used in lathe? Describe in detail the method of using them. [8] 3. (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] 4. Write a brief note on the following

[4x4=16]

(a) Super finishing (b) Cylindrical super finishing (c) Flat and Spherical super finishing (d) Polishing 5. (a) Explain the terms: Basic size; Zero line; lower and upper deviations. Draw a conventional diagram to represent these terms for a shaft and hole pair of interference fit. (b) The hole and shaft assembly of 30mm nominal size have tolerances specified −0.04 as 30+0.02 −0.000 mm for hole and 30−0.07 mm for shaft. Determine i. ii. iii. iv. v. vi.

Maximum and minimum clearance (interference) attainable Allowance Hole and shaft tolerances Fundamental deviation MML for shaft and hole Type of fit. Sketch these values on a conventional diagram.

[8+8]

6. Explicate the use of (a) angle gauges (b) sine bars for measurement of angles 1 of 2

[8+8]

Set No. 4

Code No: RR322402 7. Elucidate the working principles of (a) Autocollimator (b) Optical projector (c) Straight edge

[6+5+5]

8. (a) Enumerate the basic differences between electrical and mechanical comparators. (b) Explicate the working principle of i. electronic comparator ii. pneumatic comparator

[6+10] ⋆⋆⋆⋆⋆

2 of 2