NIMS CNC MILLING LEVEL I CERTIFICATION EXAM
1. What does CNC stand for?
A. Computer Numerical Control
B. Central Numeric Command
C. Computer Network Control
D. Controlled Numeric Circuit
Answer: A
Rationale: CNC stands for Computer Numerical Control,
referring to the automated control of machining tools via a
computer executing programmed instructions.
2. Which axis on a CNC mill typically represents left-to-right
movement?
A. Y-axis
B. Z-axis
C. X-axis
D. W-axis
Answer: C
Rationale: The X-axis on a CNC milling machine controls
horizontal movement from left to right.
3. What is the primary function of G-code?
A. Machine maintenance
B. Programming tool paths
C. Measuring tools
D. Cooling the spindle
, Answer: B
Rationale: G-code is the language used to instruct CNC
machines on movement, speeds, and tool paths.
4. Which G-code is commonly used for rapid positioning?
A. G00
B. G01
C. G02
D. G03
Answer: A
Rationale: G00 is used for rapid movement of the tool to a
specified location without cutting.
5. What does G01 indicate?
A. Circular motion
B. Tool change
C. Linear interpolation
D. Spindle stop
Answer: C
Rationale: G01 commands the machine to move in a
straight line at a controlled feed rate.
6. Which tool is typically used for facing operations?
A. Ball end mill
B. Twist drill
C. Face mill
D. Reamer
, Answer: C
Rationale: A face mill is designed to create flat surfaces by
removing material from the top of a workpiece.
7. What is the purpose of a coolant in milling?
A. Increase friction
B. Reduce heat and remove chips
C. Slow down the machine
D. Improve tool color
Answer: B
Rationale: Coolant reduces heat buildup and helps flush
chips away from the cutting area, improving tool life and
finish.
8. Which axis controls vertical movement?
A. X-axis
B. Y-axis
C. Z-axis
D. A-axis
Answer: C
Rationale: The Z-axis controls up-and-down movement of
the tool or table.
9. What is spindle speed measured in?
A. Inches per minute
B. Revolutions per minute
C. Feet per second
, D. Degrees
Answer: B
Rationale: Spindle speed refers to how fast the tool rotates,
measured in RPM.
10. What does a feed rate control?
A. Tool temperature
B. Cutting depth
C. Speed of tool movement through material
D. Machine startup
Answer: C
Rationale: Feed rate determines how fast the cutting tool
advances through the material.
11. What is the function of a vise on a CNC mill?
A. Cool the tool
B. Hold the workpiece securely
C. Measure dimensions
D. Control spindle speed
Answer: B
Rationale: A vise is used to clamp and secure the workpiece
during machining.
12. Which code stops the spindle?
A. M03
B. M04
C. M05
1. What does CNC stand for?
A. Computer Numerical Control
B. Central Numeric Command
C. Computer Network Control
D. Controlled Numeric Circuit
Answer: A
Rationale: CNC stands for Computer Numerical Control,
referring to the automated control of machining tools via a
computer executing programmed instructions.
2. Which axis on a CNC mill typically represents left-to-right
movement?
A. Y-axis
B. Z-axis
C. X-axis
D. W-axis
Answer: C
Rationale: The X-axis on a CNC milling machine controls
horizontal movement from left to right.
3. What is the primary function of G-code?
A. Machine maintenance
B. Programming tool paths
C. Measuring tools
D. Cooling the spindle
, Answer: B
Rationale: G-code is the language used to instruct CNC
machines on movement, speeds, and tool paths.
4. Which G-code is commonly used for rapid positioning?
A. G00
B. G01
C. G02
D. G03
Answer: A
Rationale: G00 is used for rapid movement of the tool to a
specified location without cutting.
5. What does G01 indicate?
A. Circular motion
B. Tool change
C. Linear interpolation
D. Spindle stop
Answer: C
Rationale: G01 commands the machine to move in a
straight line at a controlled feed rate.
6. Which tool is typically used for facing operations?
A. Ball end mill
B. Twist drill
C. Face mill
D. Reamer
, Answer: C
Rationale: A face mill is designed to create flat surfaces by
removing material from the top of a workpiece.
7. What is the purpose of a coolant in milling?
A. Increase friction
B. Reduce heat and remove chips
C. Slow down the machine
D. Improve tool color
Answer: B
Rationale: Coolant reduces heat buildup and helps flush
chips away from the cutting area, improving tool life and
finish.
8. Which axis controls vertical movement?
A. X-axis
B. Y-axis
C. Z-axis
D. A-axis
Answer: C
Rationale: The Z-axis controls up-and-down movement of
the tool or table.
9. What is spindle speed measured in?
A. Inches per minute
B. Revolutions per minute
C. Feet per second
, D. Degrees
Answer: B
Rationale: Spindle speed refers to how fast the tool rotates,
measured in RPM.
10. What does a feed rate control?
A. Tool temperature
B. Cutting depth
C. Speed of tool movement through material
D. Machine startup
Answer: C
Rationale: Feed rate determines how fast the cutting tool
advances through the material.
11. What is the function of a vise on a CNC mill?
A. Cool the tool
B. Hold the workpiece securely
C. Measure dimensions
D. Control spindle speed
Answer: B
Rationale: A vise is used to clamp and secure the workpiece
during machining.
12. Which code stops the spindle?
A. M03
B. M04
C. M05
