Mtech. Precision Engineering

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R09 Code No: D109113303 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD M.Tech I Semester Regular Examinations March/April 2010 PRECISION ENGINEERING (Common to Advanced Manufacturing Systems, CAD-CAM and Design for Manufacturing) Time: 3hours Max.Marks:60 Answer any five questions All questions carry equal marks --1. a) b)

Discuss the spindle accuracy requirements of machine tool. Explain the basic components of displacement errors.

2. a) b)

Explain the datum features of curved surfaces. Explain how orientation control is achieved in manufacturing.

3.

Explain the features of grouped datum system with pin and hole.

4. a) b)

Discuss the steps involved in computation of transtational accuracy. What are the advantages and disadvantages of two mutually perpendicular grouped datum planes?

5. a) b)

Explain nano physical processing of atomic bit units. Explain any one method of on-machine measurement of dimensional features.

6. a) b)

Write a detailed note on process capability. Discuss the cumulative effect of tolerances.

7. a) b)

Explain the operation sequence for shaft type components. With the help of an example explain the design features to facilitate machining.

8.

Write short notes on any three of the following: a) Tolerance Work Sheets. b) Geometric Tolerances. c) Equalizing Datums. d) Velocity Lags.

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R09

Code No: C3303, C0403, C5203 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD M.Tech I- Semester Supplementary Examinations September, 2010 PRECISION ENGINEERING (COMMON TO ADVANCED MANUFACTURING SYSTEMS, CAD/CAM, DESIGN FOR MANUFACTURING) Time: 3hours Max. Marks: 60 Answer any five questions All questions carry equal marks ---

1. a) b)

Discuss in detail about accuracy requirements of numerical control systems in a machine tool. Explain about errors due to circular interpolation.

2. a) b)

Discuss the datum features of oddly configured system. Explain how form control is achieved in manufacturing.

3.

Explain the features of grouped datum system with spigot and recess.

4. a) b)

Explain the steps involved in computation of rotational accuracy. What are the advantages and disadvantages of three mutually perpendicular grouped datum planes?

5. a) b)

Write a detailed note on the system of nanometer accuracy. Explain the process of electro chemical atomic bit processing.

6. a)

Explain about the working of any one optical measuring system used for port process measurement of dimensional features. Discuss the cumulative effect of tolerances.

b) 7. a) b)

Explain the redesign processes of manufactured component. With the help of a suitable example explain central analysis.

8.

Write short notes on any three of the following a) Logical approach to tolerancing b) Types of datum systems c) Skewness d) Tolerance work shuts

*****

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R09

Code No: C3303, C0403, C5203 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD M.Tech I Semester Supplementary Examinations September 2010 PRECISION ENGINEERING (COMMON TO ADVANCED MANUFACTURING SYSTEMS, CAD/CAM, DESIGN FOR MANUFACTURING) Time: 3hours Max.Marks:60 Answer any five questions All questions carry equal marks --1.a) b)

Explain the displacement measurement system in detail. Discuss the accuracy of numerical control systems.

[12]

2.a) b)

What are tolerance zone conversions? Explain. Explain the logical approach to tolerancing.

[12]

3.a) b)

Discuss the computation of transactional and rotational accuracy. Explain the grouped datum system with spigot and recess pair.

[12]

4a) b)

What is meant by process capability? Explain. Explain the feature tolerances.

[12]

5.a) b)

Explain the cumulative effect of tolerances. Discuss the tolerance laws in detail.

[12]

6.a) b)

What is meant by process drawing? How do you prepare it? Explain What are tolerance work sheets? Discuss.

[12]

7.a) b)

Explain the nano physical processing of atomic bit units. Explain electro chemical atomic bit processing.

[12]

8.a) b)

What is in process measurement? Explain. What is meant by an optical measuring system? Explain.

[12]

*****

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R09

Code No: C3303, C0403, C5203 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD M.Tech I - Semester Examinations October/November-2011 PRECISION ENGINEERING (COMMON TO ADVANCED MANUFACTURING SYSTEMS, CAD/CAM, DESIGN FOR MANUFACTURING) Time: 3hours Max.Marks:60 Answer any five questions All questions carry equal marks --1.a) b)

2.a) b)

Explain about dimensional and geometrical accuracies and explain the effect of spindle displacement on the overall accuracy. Describe the affect of CNC machine tool accuracy on the component accuracy. [12] What are the probable errors in the measuring equipment & machines in finding the accuracy of components? How are the form controls and orientation controls and selection of datum surfaces done? [12]

3.a) b)

How are he grouped datum surfaces chosen in computation of accuracy? How is the accuracy of tongue & slot pair computed and measured? [12]

4.a)

Differentiate between surface finish and accuracy of components ant their effects on the overall performance. Describe the attainable tolerance grades in various machining operations and mention the reasons for not obtaining beyond. [12]

b)

5.a) b)

How are the tolerance grades and accuracies designed and mentioned on the drawings? Describe the preparation of process drawings for various operations taking into the tolerances & accuracies. [12]

6.a) b)

Sketch & explain the processing of the components to obtain Nano-accuracies. Describe the need of Nano-accuracies and Electro – chemical processing. [12]

7.a)

What are the various in – processing methods used to find the accuracy and finish obtained in Nano – machining? Differentiate the effects of in – process and post – process measuring methods and discuss their effects on the overall performance. [12]

b)

8.

Answer the following. a) Optical measuring methods b) Cumulative effect of tolerances c) Accuracy of machine tools.

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[12]

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R09

Code No: C3303, C0403, C5203 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD M.Tech I - Semester Examinations April/May-2012 PRECISION ENGINEERING (COMMON TO ADVANCED MANUFACTURING SYSTEMS, CAD/CAM, DESIGN FOR MANUFACTURING) Time: 3hours Max.Marks:60 Answer any five questions All questions carry equal marks --1.a) b)

2.a) b) 3.a) b)

Explain the construction of main spindle of the machine tool to meet the accuracy requirements in CNC machine tools. Why linear and circular interpolations are having different errors explain the remedy for it. What is tolerance zone conversion? Discuss the datum features of oddly configured system. Explain and differentiate orientation control and form control in manufacturing. What is Grouped Datum Systems? Explain two and three mutually perpendicular grouped datum planes with an example. Explain the features of grouped datum system with spigot and recess pair and tongue.

4.a) b)

Explain the steps involved in computation of rotational accuracy. What are the advantages and disadvantages of grouped datum system with spigot and recess, pin and hole?

5.a) b)

What is process capability? Explain Process Capability Metrics. Explain the relationship between attainable tolerance grades and machining process. Consider any common machining process to explain.

6.a)

With a neat diagram discuss about the working of any one optical measuring system used for post process measurement of dimensional features. With out effecting the functionality of the part explain manufacturing considerations in component design taking Machining Considerations.

b)

7.a) b)

Discuss nano physical processing of atomic bit units. Explain mechanism of metal Processing Systems for nanometer accuracies.

8. a) b) c)

Write short notes In process measurement Types of datum systems Electrochemical atomic bit processing.

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