1. a) What is NC? What are the major advantages of CNC machine tool compared to its conventional counter part?
b) How do you designate the coordinate axes for a CNC lathe? Show them diagrammatically on a rough sketch of a lathe.
2. a) How BCD system differs from Binary system? Explain how the eight track tape coding is specified in ISO and EIA.
b) Explain important features of a CNC machining centre.
3. a) What is the function of a Transducer in CNC? Explain any one type of a Transducer.
b) Explain the function of MCU and explain its organization to perform its functions.
4. Prepare manual part program for machining the component with 4 holes of 10 mm diameter on 60 mm p.c.d. as shown in Fig.1 using ISO code. Do not use G41 or G42.
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Fig.1
5. Prepare manual part programming for turning the component shown in Fig.2 on CNC lathe using ISO code. Assume the tool tip radius is 2 mm.
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Fig. 2
6. a) Give any six circle definitions in APT geometry.
b) Write APT geometry to define lines and circles shown in Fig.3.
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Fig. 3
7. Prepare NC program in APT for machining the contour shown in Fig.4 with two passes one with rough-cut and other with finish cut.
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Fig. 4
8. Write short notes on any FOUR of the following:
i) Servo system ii) Presenting tools
iii) Tab sequential format iv) MATRIX definition in APT
v) INTOL and OUTTOL commands vi) Post processor
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