Download JNTUA M.Tech 2nd Sem Reg-Supply 2018 Aug-Sept 9D04204 CNC Technology And Programming Question Paper

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Code: 9D04204

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M.Tech II Semester Supplementary Examinations August/September 2018

CNC TECHNOLOGY & PROGRAMMING

(CAD/CAM)

(For students admitted in 2013, 2014, 2015 & 2016 only)

Time: 3 hours

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Max. Marks: 60

Answer any FIVE questions

All questions carry equal marks

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1. (a) Discuss the importance of CNC machine tools over conventional machine tools and present the results in a tabulated form.
   

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   (b) With schematic diagrams, explain the working principle of CNC machine tools and indicate various elements in CNC machine tools.
2. (a) Discuss the constructional features of spindle drives with an illustration.
   (b) Explain any six functions / characteristics of CNC machine tool slide ways.
3. (a) Describe the role of Automatic Tool Changers (ATC) in machining centers with schematic diagrams.
   (b) Sketch the schematic view of a CNC machine tool with its accessories.

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4. (a) With schematic diagram, explain the construction and working principle of rotary encoder.
   (b) Explain the concept of Moire fringe method in displacement measurement of CNC machine table.
5. (a) Differentiate between sensors and transducers. Highlight any four types of sensors / transducers.
   (b) Discuss the working principle and characteristics of electro-magnetic positional transducers.
6. (a) Explain the APT programming language structure with one example.
   

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   (b) Discuss APT motion commands with examples.
7. (a) With a block diagram, explain the open-loop and closed-loop control systems.
   (b) Discuss standard features of CNC control systems.
8. (a) Explain the factors influencing while selecting CNC machine tools.
   (b) Describe the method of calculating the machine-hour-rate with one example.

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