One line question: CO1
1. Define Computer Aided Manufacturing.
2. Give advantage of using CAM in industries.
3. List any one application of CAM in mechanical engineering.
4. Name any two types of manufacturing systems.
5. What is the difference between manual and automated manufacturing systems?
8. What is the full form of NC in manufacturing?
9. State any one benefit of using CNC machines over conventional machines.
10. What is the basic difference between CNC and DNC?
11. Name any two components of a CNC machine.
12. What type of control system is used in CNC machines?
13. Define DNC in one sentence.
14. Write one advantage of using DNC systems.
15. What is the use of G-codes in CNC programming?
16. What is the use of M code in CNC programming?
FILL UP THE BLANKS. CO1
The letter G in a CNC program represents preparatory codes.
The letter M in CNC programming is used for miscellaneous functions.
G00 command is used for rapid positioning.
G01 is used for linear interpolation or cutting in a straight line.
The program ending command is M30.
DNC stands for Direct Numerical Control.
In NC machines, instructions are stored on punched tape.
G00 is used for rapid positioning of the tool.
G01 command is used for linear interpolation (straight-line cutting).
G02 is used for clockwise circular interpolation.
G03 is used for counter-clockwise circular interpolation.
G90 is used for absolute programming.
G91 is used for incremental programming.
M03 is used to start the spindle in clockwise direction.
M05 is used to stop the spindle.
M08 is used to turn on coolant.
M30 is used to end the program and reset the CNC machine.
NC stands for Numerical Control
DNC stands for _ Direct Numerical Control
The component in CNC that interprets the program is called the controller
CNC machines are more accurate and flexible than NC____________ machines.
CNC machines are more accurate and flexible than NC conventional machines.
G-codes are used to control motion functions.
M-codes are used to control machine/tool functions.
A CNC program consists of a sequence of blocks.
Stepper motors are commonly used in open-loop NC systems. ✅
In an open loop NC system, there is no feedback from the machine.
DNC stands for Direct Numerical Control.
Stepper motors are commonly used in open-loop NC systems. ✅
QUESTIONS. CO2
What are slideways? List any two types of slideways used in CNC machines.
Explain the importance of slideways in machine tools.
Define motion transmission. Name any two elements used for motion transmission.
What is an Automatic Tool Changer (ATC)? State its function in CNC machines.
List any two advantages of using Automatic Tool Changer in CNC machining.
Explain the use of multiple pallet systems in CNC machining centers.
What is the benefit of using pallet changers in mass production?
What is an encoder? Mention its role in CNC machines.
Define transducer. Give one example used in CNC machines.
Explain the importance of feedback systems in CNC machines.
Define a sensor. Give two examples used in CNC systems.
What is an actuator? State its function in CNC machines.
Explain the difference between sensors and actuators with examples.
List two types of actuators and state one application of each.
What is the function of a spindle drive in a CNC machine?
Define axis designation. Write the axis notation for 3-axis CNC machines for CNC
lathe and milling.
Identify and explain two types of sensors used in CNC machines.
Compare linear axis drive and rotary axis drive with suitable examples.
What is the difference between open-loop and closed-loop drive systems in CNC?
Compare servo and stepper motors used in CNC axis drives.
Describe the role of transducers in CNC machines and give two examples.
Illustrate the use of feedback devices to improve machining accuracy in CNC
machines.
Differentiate between absolute and incremental programming used in CNC machines
Define slide ways and list any two types used in CNC machines.
List the types of motion transmission elements used in CNC machines and describe
any two briefly
CNC PROGRAM. CO3
Write a basic CNC part program using G01 command to cut a straight line from (0,0) to
(50,0).
Write a sample CNC turning part program to reduce the diameter of a cylindrical work piece
from Ø65 mm to Ø55 mm over a length of 60 mm.
Write a sample CNC turning part program to reduce the diameter of a cylindrical work piece
from Ø75 mm to Ø45 mm over a length of 80 mm.
Write a CNC part program to perform step turning from Ø50 mm to Ø40 mm for 40 mm
length, then from Ø40 mm to Ø30 mm for another 30 mm length.
Write a CNC part program to turn and finish a bar from Ø45 mm to Ø35 mm over a length of
100 mm, using roughing and finishing passes.
