Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 5th Sem New 2154103 Cnc Machine And Metrology Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2154103 Date: 29/11/2019
Subject Name: CNC Machine and Metrology
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) How does the structure of NC/CNC machine tools differ from
conventional machine tools?
03
(b) Classify CNC machines tools on the basis of :
(i) Types of motion control
(ii) According to programming Method.
(iii) According to types of controllers
04
(c) Explain types of guide ways used in CNC machine tool .Describe any
one with sketch the working and construction of guide ways/slide ways
used in CNC machine tools.
07
Q.2 (a) Write short note on ATC? 03
(b) Explain work holding device use in CNC machine tool. Describe any
one with sketch.
04
(c) List various feedback devices used in CNC machine. Explain working
principle of Rotary encoder with neat sketch.
07
OR
(c) Explain open-loop control system used in a CNC system with a
schematic diagram. Draw a block diagram of velocity control loop for
a closed loop
control system.
07
Q.3 (a) Explain with neat sketch, axis designation for CNC turning centre. 03
(b) What are canned cycles? How are they useful in writing part programs. 04
(c) Explain Coordinate system used in CNC machine tools. 07
OR
Q.3 (a) Which are formats used for part programming? Write word address
format.
03
(b) What is the difference between canned cycle and subroutine? 04
(c)
Write a CNC program using appropriate G and M code to turn
component as shown in figure cutting speed V=40m/min and
feed=0.1,assume suitable data for depth of cut.
07
Q.4 (a) Explain cutter radius compensation and tool length compensation. 03
(b) Explain types of statements used in APT language. 04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2154103 Date: 29/11/2019
Subject Name: CNC Machine and Metrology
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) How does the structure of NC/CNC machine tools differ from
conventional machine tools?
03
(b) Classify CNC machines tools on the basis of :
(i) Types of motion control
(ii) According to programming Method.
(iii) According to types of controllers
04
(c) Explain types of guide ways used in CNC machine tool .Describe any
one with sketch the working and construction of guide ways/slide ways
used in CNC machine tools.
07
Q.2 (a) Write short note on ATC? 03
(b) Explain work holding device use in CNC machine tool. Describe any
one with sketch.
04
(c) List various feedback devices used in CNC machine. Explain working
principle of Rotary encoder with neat sketch.
07
OR
(c) Explain open-loop control system used in a CNC system with a
schematic diagram. Draw a block diagram of velocity control loop for
a closed loop
control system.
07
Q.3 (a) Explain with neat sketch, axis designation for CNC turning centre. 03
(b) What are canned cycles? How are they useful in writing part programs. 04
(c) Explain Coordinate system used in CNC machine tools. 07
OR
Q.3 (a) Which are formats used for part programming? Write word address
format.
03
(b) What is the difference between canned cycle and subroutine? 04
(c)
Write a CNC program using appropriate G and M code to turn
component as shown in figure cutting speed V=40m/min and
feed=0.1,assume suitable data for depth of cut.
07
Q.4 (a) Explain cutter radius compensation and tool length compensation. 03
(b) Explain types of statements used in APT language. 04
2
(c) What do you mean by pyrometry? Enlist various types of pyrometers. 07
OR
Q.4 (a) Explain Inter changeability. 03
(b) What is Sine Bar? Discuss working of Sine bar when component is of
large size.
04
(c)
Sketch and working of autocollimator and write application. 07
Q.5 (a) Write the application and limitation of angle gauges. 03
(b) State what is maximum and minimum material limits according to
Taylor?s principle.
04
(c) What is CMM? Explain in brief with its constructional Featured. 07
OR
Q.5 (a) What is measurement error? Classify errors and explain any one in
short.
03
(b) Explain Laser interferometer. State it?s Application. 04
(c) Explain the working of Taylor Hobson Talysruf with neat sketch. 07
*********
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This post was last modified on 20 February 2020