Michigan CNC Milling Technician Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a CNC milling machine?
A. To weld metal components
B. To bend sheet metal
C. To remove material from a workpiece using rotary cutters
D. To cast molten metal
Bold-italic rationale: The primary purpose of CNC milling is to remove
material by feeding a workpiece against a rotating cutting tool,
shaping it to specified dimensions.
2. What does G-code primarily control in CNC milling operations?
A. Material type selection
B. Machine motion and toolpath instructions
C. Tool sharpening schedule
D. Coolant composition
Bold-italic rationale: G-code provides instructions for machine
movement, including axes positions, speeds, and feed rates, directing
the milling process.
3. Which axis typically represents vertical movement on a CNC milling
machine?
A. X-axis
B. Y-axis
C. Z-axis
D. A-axis
Bold-italic rationale: The Z-axis is conventionally used for vertical
motion, controlling up and down movement of the spindle or table.
,4. What is the function of a tool offset in CNC machining?
A. To reduce electrical consumption
B. To cool the spindle
C. To account for differences in tool length and diameter
D. To align machine foundations
Bold-italic rationale: Tool offsets compensate for the physical
dimensions of different tools, ensuring accurate positioning during
cutting.
5. What does “RPM” stand for in milling operations?
A. Rotary Per Minute
B. Rapid Position Movement
C. Revolutions Per Minute
D. Rotation Pressure Measurement
Bold-italic rationale: RPM measures the number of spindle revolutions
per minute, directly influencing cutting speed and surface finish.
6. Which of the following materials requires a slower cutting speed due
to hardness?
A. Aluminum
B. Brass
C. Stainless steel
D. Plastic
Bold-italic rationale: Stainless steel is harder and more resistant than
aluminum or brass, thus requiring slower cutting speeds to prevent
tool wear and heat buildup.
7. What type of cutter is best for producing flat surfaces on a workpiece?
A. Ball nose end mill
B. Face mill
C. Drill bit
D. Reamer
Bold-italic rationale: A face mill is designed with multiple cutting
edges to efficiently remove material across flat surfaces.
8. What does “feed rate” refer to in CNC milling?
A. The spindle’s coolant flow
B. The speed at which the tool advances through the material
C. The weight of the workpiece
, D. The machine’s electrical load
Bold-italic rationale: Feed rate is the rate at which the cutter moves
through the workpiece and is critical for surface finish and tool life.
9. What component holds the workpiece in place on a CNC milling
machine?
A. Spindle
B. Coolant pump
C. Vise
D. Control panel
Bold-italic rationale: A vise clamps the workpiece securely to the
machine table, preventing movement during cutting operations.
10. Which code is used to stop the spindle rotation?
A. G00
B. G01
C. M05
D. M03
Bold-italic rationale: M05 is a machine stop command that specifically
halts spindle rotation in CNC programming.
11. What tool would you use to create a threaded hole?
A. End mill
B. Face mill
C. Tap
D. Reamer
Bold-italic rationale: A tap cuts internal threads in a predrilled hole,
enabling screws or bolts to be installed.
12. What is a common safety practice before changing tools?
A. Starting the spindle
B. Increasing feed rate
C. Turning off the machine and locking out power
D. Removing guards during operation
Bold-italic rationale: Lockout and power shutdown prevent accidental
movement or activation while changing tools, ensuring operator
safety.
13. What is the typical first step in a CNC milling program?
A. Turn off the coolant
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a CNC milling machine?
A. To weld metal components
B. To bend sheet metal
C. To remove material from a workpiece using rotary cutters
D. To cast molten metal
Bold-italic rationale: The primary purpose of CNC milling is to remove
material by feeding a workpiece against a rotating cutting tool,
shaping it to specified dimensions.
2. What does G-code primarily control in CNC milling operations?
A. Material type selection
B. Machine motion and toolpath instructions
C. Tool sharpening schedule
D. Coolant composition
Bold-italic rationale: G-code provides instructions for machine
movement, including axes positions, speeds, and feed rates, directing
the milling process.
3. Which axis typically represents vertical movement on a CNC milling
machine?
A. X-axis
B. Y-axis
C. Z-axis
D. A-axis
Bold-italic rationale: The Z-axis is conventionally used for vertical
motion, controlling up and down movement of the spindle or table.
,4. What is the function of a tool offset in CNC machining?
A. To reduce electrical consumption
B. To cool the spindle
C. To account for differences in tool length and diameter
D. To align machine foundations
Bold-italic rationale: Tool offsets compensate for the physical
dimensions of different tools, ensuring accurate positioning during
cutting.
5. What does “RPM” stand for in milling operations?
A. Rotary Per Minute
B. Rapid Position Movement
C. Revolutions Per Minute
D. Rotation Pressure Measurement
Bold-italic rationale: RPM measures the number of spindle revolutions
per minute, directly influencing cutting speed and surface finish.
6. Which of the following materials requires a slower cutting speed due
to hardness?
A. Aluminum
B. Brass
C. Stainless steel
D. Plastic
Bold-italic rationale: Stainless steel is harder and more resistant than
aluminum or brass, thus requiring slower cutting speeds to prevent
tool wear and heat buildup.
7. What type of cutter is best for producing flat surfaces on a workpiece?
A. Ball nose end mill
B. Face mill
C. Drill bit
D. Reamer
Bold-italic rationale: A face mill is designed with multiple cutting
edges to efficiently remove material across flat surfaces.
8. What does “feed rate” refer to in CNC milling?
A. The spindle’s coolant flow
B. The speed at which the tool advances through the material
C. The weight of the workpiece
, D. The machine’s electrical load
Bold-italic rationale: Feed rate is the rate at which the cutter moves
through the workpiece and is critical for surface finish and tool life.
9. What component holds the workpiece in place on a CNC milling
machine?
A. Spindle
B. Coolant pump
C. Vise
D. Control panel
Bold-italic rationale: A vise clamps the workpiece securely to the
machine table, preventing movement during cutting operations.
10. Which code is used to stop the spindle rotation?
A. G00
B. G01
C. M05
D. M03
Bold-italic rationale: M05 is a machine stop command that specifically
halts spindle rotation in CNC programming.
11. What tool would you use to create a threaded hole?
A. End mill
B. Face mill
C. Tap
D. Reamer
Bold-italic rationale: A tap cuts internal threads in a predrilled hole,
enabling screws or bolts to be installed.
12. What is a common safety practice before changing tools?
A. Starting the spindle
B. Increasing feed rate
C. Turning off the machine and locking out power
D. Removing guards during operation
Bold-italic rationale: Lockout and power shutdown prevent accidental
movement or activation while changing tools, ensuring operator
safety.
13. What is the typical first step in a CNC milling program?
A. Turn off the coolant
