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.
 |
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.
 |
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.
 |
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.
 |
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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