1. What is the difference between a closed-loop control system and an open-loop

Question

1. What is the difference between a closed-loop control system and an open-loop control system? (20 Marks) 2. What is the home position in CNC machine and what is it used for? (20 marks) 3. In G-Code programing, fill the blanks in the two lines of program to move the tool from location A to B with feed rate of 10 meters/min and from B to C with maximum speed (20 marks) Locations: A (0,0), B (10,10), C (12,16) Assume the tool is in location A and system is in absolute positioning setting. NOO G90 N20 G...X.. Y... M30 4. Why are the nontraditional material removal processes important? (100 words) (20 marks)

Explanation / Answer

1)

Open loop control system is a type of system where no feed back is provided, so error correction is not possible in case of the variation of output of system.

Example- electronic fan switch when turned on, in absence of feedback system, can not guarantee that the output of the fan are accurate or it is slightly different so it is an open loop control system.

Closed loop control system is provided with a feedback system so it adjust the input of the system to correct the output in case of any variation.

Example- same electric switch if you observe the fan output and manage the switch, if speed is not correct then you are the feedback of the system which is used to rectify the error.

2)

Home position is the origin of machine coordinate system. Home position is located at positive end of each axes that is X,Y,Z. The control unit of machine measures the dimensions provided from the reference point as Home position. At some places home position is also used for tool changing and palette changing.

3)

N00 G90

N10 G01 X10 Y10 F10

N20 G00 X12 Y16

M30

Explanation-

G01 is used for linear interpolation.

G00 is used for rapid transverse motion of tool.

4)

With traditional machining Novel materials having high strength and finishing are some time impossible to work with, which are only done with non-traditional machines. To obtain very high tolerence, use of non-traditional machining is necessary. The need to a avoid surface damage that often accompanies
the stresses created by nontraditional machining.

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