IME 146 FINAL EXAM | QUESTIONS AND ANSWERS |
WITH COMPLETE SOLUTION
Three different components of CNC machines Answer - 1. Program of
Instructions (G&M Codes)
2. Machine Control Unit (controller)
3. Processing Equipment (tooling)
What are the three main ways G & M code can be created for a CNC machine?
Answer - manual programing, conversational programming, CAD/CAM
programing.
What type of coordinate system is CNC milling G & M code based off of?
Answer - Cartesian coordinate system.
Our Haas CNC machines have a closed loop positioning system. What does this
mean, and how does the closed loop system work? Answer - closed loop
system get feedback to verify that the appropriate actions have occurred. In
the closed loop system a machine control sends a motion signal through a
controller board to a servomotor. This servomotor rotates causing the table to
move in an opposite direction. Then an optical encoder continuously compares
and monitors the position of the axis to the commanded position.
, What is the purpose of the ball screw in a CNC mill's drive system? Answer -
turns rotary motion from the servo motor into linear axis motion.
What is a fixture offset (WCS) used for in a CNC mill and what is the most
common alphanumeric code used to call up a fixture offset in a CNC program?
Answer - used to provide a way for the CNC control to know the distance from
the machine home position and parts coordinate system. G54 "home location"
is the most common alphanumeric code used to call up a fixture offset in a CNC
program.
What is the purpose of a tool length offset in a CNC mill? What alphanumeric
codes are used to set a tool length offset in a CNC program? Answer - The stick
out then tells us the relative position of the bottom of the tool to the WCS. G43
is the code used to set a tool length offset in a CNC program.
What is a G-code? Give two examples of commonly used G codes in a CNC
program. Answer - preparatory codes that prepare the machine for a certain
type of motion. Commonly used G codes in a CNC program would include, G00
(rapid motion), and G54 (Home locations).
G02, Answer - Clockwise
G03 Answer - (Counter-clockwise) cuts and arc or circle.
G01 Answer - cuts in a straight line G03
What is an M code? Answer - An M code are miscellaneous codes.
Give two examples of commonly used M codes in a CNC program. Answer -
M06 (tool change), and M30 (End program)
WITH COMPLETE SOLUTION
Three different components of CNC machines Answer - 1. Program of
Instructions (G&M Codes)
2. Machine Control Unit (controller)
3. Processing Equipment (tooling)
What are the three main ways G & M code can be created for a CNC machine?
Answer - manual programing, conversational programming, CAD/CAM
programing.
What type of coordinate system is CNC milling G & M code based off of?
Answer - Cartesian coordinate system.
Our Haas CNC machines have a closed loop positioning system. What does this
mean, and how does the closed loop system work? Answer - closed loop
system get feedback to verify that the appropriate actions have occurred. In
the closed loop system a machine control sends a motion signal through a
controller board to a servomotor. This servomotor rotates causing the table to
move in an opposite direction. Then an optical encoder continuously compares
and monitors the position of the axis to the commanded position.
, What is the purpose of the ball screw in a CNC mill's drive system? Answer -
turns rotary motion from the servo motor into linear axis motion.
What is a fixture offset (WCS) used for in a CNC mill and what is the most
common alphanumeric code used to call up a fixture offset in a CNC program?
Answer - used to provide a way for the CNC control to know the distance from
the machine home position and parts coordinate system. G54 "home location"
is the most common alphanumeric code used to call up a fixture offset in a CNC
program.
What is the purpose of a tool length offset in a CNC mill? What alphanumeric
codes are used to set a tool length offset in a CNC program? Answer - The stick
out then tells us the relative position of the bottom of the tool to the WCS. G43
is the code used to set a tool length offset in a CNC program.
What is a G-code? Give two examples of commonly used G codes in a CNC
program. Answer - preparatory codes that prepare the machine for a certain
type of motion. Commonly used G codes in a CNC program would include, G00
(rapid motion), and G54 (Home locations).
G02, Answer - Clockwise
G03 Answer - (Counter-clockwise) cuts and arc or circle.
G01 Answer - cuts in a straight line G03
What is an M code? Answer - An M code are miscellaneous codes.
Give two examples of commonly used M codes in a CNC program. Answer -
M06 (tool change), and M30 (End program)
