II Semester M.E. (Control & Instrumentation) Degree Examination, July/August 2013 2K8 CI 214 : COMPUTER NUMERICAL CONTROL Time : 3 Hours
Max. Marks : 100
Instruction : Answer any five full questions. 1. a) What is difference between NC and CNC machines ? Explain advantages and disadvantages. 10 b) Explain features of CNC with an example. 2. a) Write a note on Turret Punch Press Machine Tool.
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b) What is dwell ? Explain its functions and how it is specified in part program. 10 3. a) Write a note on coatings used in cutting tools. b) Explain various operating modes of CNC machine. 4. a) Write about optical rotary encoders. Explain absolute and incremental encoders. b) Explain rotary ball screws and its classification with advantages and disadvantages. 5. a) Explain the basic principle of DDA and linear interpolation. b) Describe the PC interfacing input device. 6. a) Explain timers and counters of PLC used in CNC machines. b) Write a note on sensors of adaptive control of CNC machine tools.
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7. Write short notes on : i) Canned cycles ii) Machine tool control systems iii) Role of PLC in CNC machines iv) Timing belts and couplings.
(b) The population of a certain town is shown in the following table 3 [7M]. Table 3. Year x 1931 1941 1951 1961 1971. Year y 40.62 60.80 79.65 103.56 132.65.
7.46 Lanczos Economization of Power Series for a General Function. 606 ...... ALGEBRAIC AND TRANSCENDENTAL EQUATIONS. 117. A. C x = x â (x â x )/(f(x ) ...
If gx ⥠.5 then approximate x = fx . 10E + 10E â d. Error = True value â Approximate value. = f x . 10E + g x . 10E â d â f x .10E â 10E â d. = (gx â 1) . 10E â d.
