Michigan CNC Operator Level 2 Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A CNC machine’s backlash compensation is used to correct which of
the following issues?
A. Tool wear
B. Reversal movement errors
C. Spindle speed variation
D. Coolant pressure fluctuation
Rationale: Backlash compensation corrects positional errors that
occur when axis direction changes due to mechanical slack._
2. What is the primary purpose of a dwell command (G04) in a CNC
program?
A. Change tool radius
B. Pause the machine for a set time
C. Activate spindle orientation
D. Reverse coolant flow
Rationale: The dwell command causes the machine to pause for a
specified period, often for immersion or dwell cutting._
3. In CNC code, G00 represents which of the following motions?
A. Controlled feed cutting
B. Threading cycle
C. Rapid traverse
D. Linear interpolation
Rationale: G00 commands the machine to move the tool rapidly to a
position without regard to cutting feed._
,4. Which tool offset register stores information for the first tool in most
CNC controls?
A. #2
B. #10
C. #1
D. #100
Rationale: Tool offset #1 is typically the first tool’s length and
diameter correction entry in the tool table._
5. During milling, a climb mill cut feeds the cutter in which direction
relative to spindle rotation?
A. Perpendicular
B. With the rotation
C. Opposite to the rotation
D. Against the feed direction
Rationale: Climb milling feeds the workpiece in the same direction as
the cutter’s rotation to reduce chip thickness._
6. What parameter is adjusted when setting a tool length offset?
A. Spindle speed
B. Coolant rate
C. Z-axis reference for tool tip
D. Feed override
Rationale: Tool length offset ensures the control knows the actual
length to accurately position the tip in the Z-axis._
7. Which of the following G-codes enables canned drilling cycles?
A. G00
B. G81
C. G90
D. G99
Rationale: G81 starts a simple drilling cycle without dwell or
pecking._
8. What does M03 command in a CNC program?
A. Turn coolant off
B. Start spindle clockwise
C. Stop spindle
, D. Activate mist coolant
Rationale: M03 initiates spindle rotation in a clockwise direction._
9. In lathe programming, what does G71 typically represent?
A. Rapid move
B. Rough turning cycle
C. Tool change
D. Threading cycle
Rationale: G71 is a roughing cycle for removing bulk material on
lathes._
10. What is the purpose of a tool wear offset?
A. Adjust spindle speed
B. Change feed per tooth
C. Compensate for tool wear during production
D. Program coolant direction
Rationale: Wear offsets fine-tune tool position for compensating
wear without altering the main offset._
11. When programming feed per tooth, what factor must be
considered?
A. Color of tool
B. Material hardness
C. Ambient temperature
D. Operator skill
Rationale: Hardness dictates cutting forces influencing optimal feed
per tooth selection._
12. Which measurement device is most appropriate for setting tool
length?
A. Vernier caliper
B. Micrometer
C. Tool presetter
D. Dial caliper
Rationale: A tool presetter accurately determines tool length and
diameter for offset entry._
13. What does G20 select on a CNC control?
A. Metric units
B. Inch units
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A CNC machine’s backlash compensation is used to correct which of
the following issues?
A. Tool wear
B. Reversal movement errors
C. Spindle speed variation
D. Coolant pressure fluctuation
Rationale: Backlash compensation corrects positional errors that
occur when axis direction changes due to mechanical slack._
2. What is the primary purpose of a dwell command (G04) in a CNC
program?
A. Change tool radius
B. Pause the machine for a set time
C. Activate spindle orientation
D. Reverse coolant flow
Rationale: The dwell command causes the machine to pause for a
specified period, often for immersion or dwell cutting._
3. In CNC code, G00 represents which of the following motions?
A. Controlled feed cutting
B. Threading cycle
C. Rapid traverse
D. Linear interpolation
Rationale: G00 commands the machine to move the tool rapidly to a
position without regard to cutting feed._
,4. Which tool offset register stores information for the first tool in most
CNC controls?
A. #2
B. #10
C. #1
D. #100
Rationale: Tool offset #1 is typically the first tool’s length and
diameter correction entry in the tool table._
5. During milling, a climb mill cut feeds the cutter in which direction
relative to spindle rotation?
A. Perpendicular
B. With the rotation
C. Opposite to the rotation
D. Against the feed direction
Rationale: Climb milling feeds the workpiece in the same direction as
the cutter’s rotation to reduce chip thickness._
6. What parameter is adjusted when setting a tool length offset?
A. Spindle speed
B. Coolant rate
C. Z-axis reference for tool tip
D. Feed override
Rationale: Tool length offset ensures the control knows the actual
length to accurately position the tip in the Z-axis._
7. Which of the following G-codes enables canned drilling cycles?
A. G00
B. G81
C. G90
D. G99
Rationale: G81 starts a simple drilling cycle without dwell or
pecking._
8. What does M03 command in a CNC program?
A. Turn coolant off
B. Start spindle clockwise
C. Stop spindle
, D. Activate mist coolant
Rationale: M03 initiates spindle rotation in a clockwise direction._
9. In lathe programming, what does G71 typically represent?
A. Rapid move
B. Rough turning cycle
C. Tool change
D. Threading cycle
Rationale: G71 is a roughing cycle for removing bulk material on
lathes._
10. What is the purpose of a tool wear offset?
A. Adjust spindle speed
B. Change feed per tooth
C. Compensate for tool wear during production
D. Program coolant direction
Rationale: Wear offsets fine-tune tool position for compensating
wear without altering the main offset._
11. When programming feed per tooth, what factor must be
considered?
A. Color of tool
B. Material hardness
C. Ambient temperature
D. Operator skill
Rationale: Hardness dictates cutting forces influencing optimal feed
per tooth selection._
12. Which measurement device is most appropriate for setting tool
length?
A. Vernier caliper
B. Micrometer
C. Tool presetter
D. Dial caliper
Rationale: A tool presetter accurately determines tool length and
diameter for offset entry._
13. What does G20 select on a CNC control?
A. Metric units
B. Inch units
