IET 377 Midterm questions and correct
answers already passed
How are the machine axis labeled? - correct answer ✔✔ Z- Always through the spindle
X- Next longest range
Y- What ever is left
Under what circumstances do you use the emergency stop? - correct answer ✔✔ True
Emergency-alternatives G28, feed stop, cycle stop
How do you verify tool paths? - correct answer ✔✔ 2D simulation (miss 3rd dimension, read
through file, dry run (offset)
What is an NC file? - correct answer ✔✔ File created by Mastercam, which includes a suite of
CAD programs used for designing and manufacturing components
What are the differences between NC, CNC, and DNC? - correct answer ✔✔ NC- Numeric
Control
CNC- Computer Numeric Control
DNC- Direct Numeric Control
What is the machine home? What does it do for you? - correct answer ✔✔ top front left hand
corner (all points referenced from there)
What is GLRP? What do it do for you? - correct answer ✔✔ Gage Length Reference Point-All H
values set against distance down
, What is/are modal commands and non-modal commands? - correct answer ✔✔ Modal- G01,
G00 (stays until not needed)
Non modal- X, Y (used once)
What is the significance of parenthesis in a NC code? - correct answer ✔✔ Not read-note to
operator
What is a safety block? - correct answer ✔✔ Clears machine memory, protect you from others
(G40 G49 G80 G90 G20 G17)
Why are % signs used in NC code? - correct answer ✔✔ Beginning/End of Tape
What is the difference between Incremental and Absolute Positioning? - correct answer ✔✔
Incremental- Reference from last point used
Absolute- 0,0 origin
What are M codes and G codes? - correct answer ✔✔ M-Machine Codes
G- Geometry Codes
What are the letters O,D,H,T,I,J, K, Q,R,N,F,X,Y and Z? - correct answer ✔✔ O- Operator
D- Diameter (Cutter Comp.)
H- Height
T- Tool
I,K- Radius of 1st and Finished Circle
Q- Radius cut increment step-over of spiral(only w/ K)
I,J- Incremental Curve
R- Radius or Reference
answers already passed
How are the machine axis labeled? - correct answer ✔✔ Z- Always through the spindle
X- Next longest range
Y- What ever is left
Under what circumstances do you use the emergency stop? - correct answer ✔✔ True
Emergency-alternatives G28, feed stop, cycle stop
How do you verify tool paths? - correct answer ✔✔ 2D simulation (miss 3rd dimension, read
through file, dry run (offset)
What is an NC file? - correct answer ✔✔ File created by Mastercam, which includes a suite of
CAD programs used for designing and manufacturing components
What are the differences between NC, CNC, and DNC? - correct answer ✔✔ NC- Numeric
Control
CNC- Computer Numeric Control
DNC- Direct Numeric Control
What is the machine home? What does it do for you? - correct answer ✔✔ top front left hand
corner (all points referenced from there)
What is GLRP? What do it do for you? - correct answer ✔✔ Gage Length Reference Point-All H
values set against distance down
, What is/are modal commands and non-modal commands? - correct answer ✔✔ Modal- G01,
G00 (stays until not needed)
Non modal- X, Y (used once)
What is the significance of parenthesis in a NC code? - correct answer ✔✔ Not read-note to
operator
What is a safety block? - correct answer ✔✔ Clears machine memory, protect you from others
(G40 G49 G80 G90 G20 G17)
Why are % signs used in NC code? - correct answer ✔✔ Beginning/End of Tape
What is the difference between Incremental and Absolute Positioning? - correct answer ✔✔
Incremental- Reference from last point used
Absolute- 0,0 origin
What are M codes and G codes? - correct answer ✔✔ M-Machine Codes
G- Geometry Codes
What are the letters O,D,H,T,I,J, K, Q,R,N,F,X,Y and Z? - correct answer ✔✔ O- Operator
D- Diameter (Cutter Comp.)
H- Height
T- Tool
I,K- Radius of 1st and Finished Circle
Q- Radius cut increment step-over of spiral(only w/ K)
I,J- Incremental Curve
R- Radius or Reference
