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Reg. No. :

Question Paper Code : 53199

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010

Fourth Semester

Mechanical Engineering

ME 2252 MANUFACTURING TECHNOLOGY II

(Regulation 2008)

(Common to PTME 2252 Manufacturing Technology II for B.E. (Part-Time)

Third Semester-Mechanical Engineering Regulation 2009)

Time : Three hours Maximum : 100 Marks

Answer ALL questions

PART A (10 2 = 20 Marks)

1. What are objectives and functions of cutting fluids?

2. Briefly explain the effect of rake angle during cutting.

3. Explain following parts of a lathe

(a) Lathe bed

(b) Carriage.

4. What is an Apron?

5. Define cutting speed, feed and machining time for drilling.

6. What is broaching?

7. Define hardness of the grinding wheel.

8. Define lapping.

9. What are the types of motion control system used in NC machines?

10. What is mean by APT language?

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PART B (5 16 = 80 Marks)

11. (a) In an orthogonal cutting operation on a workpiece of width 2.5 mm, the uncut chip thickness was 0.25 mm and the tool rake angle was zero degree. It was observed that the chip thickness was 1.25 mm. The cutting force was measured to be 900 N and the thrust force was found to be 810 N.

(i) Find the shear angle. (8)

(ii) If the coefficient of friction between the chip and the tool was 0.5,what is the machining constant Cm? (8)

Or

(b) (i) Describe the different types of chips with neat sketches. (8)

(ii) Mention the functions of cutting fluids. (8)

12. (a) Explain the following with an neat sketch

(i) Taper Turning by Swivelling the Compound Rest (5)

(ii) Taper Turning Attachment Method (6)

(iii) Taper Turning with Tailstock set over Method. (5)

Or

(b) (i) Describe the holding devices in an lathe. (9)

(ii) Mention the specification of lathe with a neat sketch. (7)

13. (a) (i) Describe the principle of operation of a shaper with a neat sketch.(8)

(ii) Describe the working of a crank and slotted link mechanism. (8)

Or

(b) (i) With a neat sketch explain the column and knee type milling machine and name its main parts. (8)

(ii) With a line diagram, describe the construction of radial drillingmachine. (8)

14. (a) Explain the working principle and various methods of centre lessgrinding with a neat sketch. (16)

Or

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Write short notes on gear

Write short notes on gear

Explain the following in CNC

(1) Linear interpolation

(2) Circular interpolation

(3) Cubic interpolation.

(ii) Describe the spindle and feed drives. State the requirement of thedrives of CNC machine tools. (8)

Or

(b) (i) Write a part program for that part shown in Fig. 1. (8)

(ii) Write a part program for drilling holes in the part shown in Fig.2.The p1ate thickness is 20mm. (8)

Fig. 1

Fig. 2

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