THAPAR UNIVERSITY Computer Control of Machine Tools,PCD101 DEC. 2014 PAPER Electronics and Communication Engineering (ECE) Notes | EduRev

Electronics and Communication Engineering (ECE) : THAPAR UNIVERSITY Computer Control of Machine Tools,PCD101 DEC. 2014 PAPER Electronics and Communication Engineering (ECE) Notes | EduRev

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Roll Number: 
THAPAR UNIVERSITY, PATIALA 
Department of Mechanical Engineering 
End Semester Examination (17
th  December, 2014) 
M.E. (CAD CAM Engg.) – 1st Year 	 Computer Aided Manufacturing (PCD105) 
M.E (Production Engg.) – 1st Year 	 Computer Control of Machine Tools (PCD101) 
Time: 03 Hours; Max. Marks: 80 
	 Course Instructor: R K Duvedi 
Note: (i) Attempt all questions and assume missing information suitably, if any. 
(ii) The evaluated 
answer copies can 
be verified on 20
th 
 December 2014 at 12:00pm in the office of 
course instructor 
Write short answers for the following: 
(i) 
Salient design features of structures of modern NC Milling Centers. 
(ii) Control functions of a 
machine control unit (MCU) in 
a CNC system. 
(iii) 
Advantages and disadvantages of direct and indirect control in CNC systems 
(iv) Need and use of an 
adaptive control system. 
(v) Difference between a 
hybrid and straight CNC system. 
(vi) 
Write the syntax for M06 code for MaxTurn Plus+ CNC turning center with usual meaning of the 
associated parameters. 
2(a) A NC milling machine, having a BLU of 0.01mm is required to cut a slot in XY plane from point A(25, 4 
35) to point B(75, 
95) using linear interpolation. The required feed rate for cutting operation is 
60mm/min. Coordinates for points A and B are in mm from the reference frame. Calculate the following: 
(i) 
Number of pulses and pulse frequency required for X and Y drive. 
(ii) 
Resolved feed rate along X and Y drives in min/min and total time required to machine the slot. 
2(b) Explain the use of G50, G96 
& 
G97 codes in CNC turning centers and G28, M98 & M99 commands in 5 
CNC milling centers with suitable examples. 
2(c) Write a complete APT program using MACRO feature for 
	 0.75 ma fan hole 	 5 
drilling a matrix of the holes as shown in figure 1. The 
	 _t_ 
number of holes in X-axis direction is 5 and the number of 
	 1.2s 
holes to be drilled in YLaxis direction is 7, thu§in-akirig-35 
	 4E-0- 
holes in all. The dimensions given are in mm. 
	 1.25 
 
1.25 
6x5 
2.0 —el 
3(a) Make a NC part program for turning center for the profile 
shown in figure 2 considering appropriate nose radius 
compensation for the following operations: 
(i) 
Stock removal cycle for turning. 
(ii) Finishing cycle 
(iii) 
Multi-pass threading cycle (for marked location, and 
assume the parameter values for threading cycle suitably). 
Figure 1: Top view of the required workpiece 
 
6 
Figure 2: Top view and front view of the work 
piece (all dimensions are in mm) 
3(b) 
Explain the various methods of NC tape encoding, decoding and verification. 
	 6 
4(a) What is an Interpolator? 
Explain the working of the 
Circular Interpolation 
algorithm for contouring 6 
motion_ control in CNC system  with suitable example. 
	 •  
4(b)   
Explain the various parameters required to be defined in Pro-E CAM package to generate CL file for 3- 6 
axis milling operation. 
5(a) What are the various tvnes c,f cencrwc and trAncrittoprc itc4,1 	 .1._ 
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