Canned cycle cancel (G80) in CNC Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to cancel the canned cycle.

CNC Programming

G[1]

Drag options to blanks, or click blank then click option'

A81

B82

C80

D83

Attempts:

3 left

💡 Hint

Common Mistakes

Using G81 which starts a drilling cycle instead of canceling.

Using G82 or G83 which are other canned cycles, not cancel commands.

The G80 command is used to cancel any active canned cycle in CNC programming.

2fill in blank

medium

Complete the code to start a drilling canned cycle and then cancel it.

CNC Programming

G[1] X10 Y20 Z-5
G[2]

Drag options to blanks, or click blank then click option'

A81

B80

C82

D83

Attempts:

3 left

💡 Hint

Common Mistakes

Using G80 to start drilling instead of canceling.

Not canceling the cycle after drilling.

G81 starts a drilling canned cycle. To cancel it, G80 is used afterward.

3fill in blank

hard

Fix the error in the code to properly cancel the canned cycle.

CNC Programming

G81 X5 Y5 Z-10
G[1]

Drag options to blanks, or click blank then click option'

A81

B83

C82

D80

Attempts:

3 left

💡 Hint

Common Mistakes

Repeating G81 instead of canceling.

Using other canned cycle codes instead of G80.

G80 cancels the active canned cycle. Using G81 again does not cancel it.

4fill in blank

hard

Fill both blanks to start a boring cycle and then cancel it.

CNC Programming

G[1] X15 Y15 Z-8 R2
G[2]

Drag options to blanks, or click blank then click option'

A85

B80

C81

D82

Attempts:

3 left

💡 Hint

Common Mistakes

Using G85 which is a different canned cycle.

Not canceling the cycle after boring.

G82 is a boring canned cycle. G80 cancels any active canned cycle.

5fill in blank

hard

Fill all three blanks to start a tapping cycle, specify feed rate, and then cancel the cycle.

CNC Programming

G[1] X20 Y25 Z-6 F[2]
G[3]

Drag options to blanks, or click blank then click option'

A84

B100

C80

D81

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong canned cycle codes for tapping.

Forgetting to cancel the cycle with G80.

G84 starts a tapping canned cycle. F100 sets the feed rate. G80 cancels the cycle.

Practice

1. What is the main purpose of the G80 command in CNC programming?

easy

A. To start a drilling cycle

B. To set the spindle speed

C. To cancel any active canned cycle

D. To move the tool to the home position

Solution

1. Step 1: Understand what a canned cycle is

   Canned cycles automate repetitive machining tasks like drilling or milling.

2. Step 2: Identify the role of G80

   G80 cancels any active canned cycle to return to normal movement commands.

3. Final Answer:

   To cancel any active canned cycle -> Option C

4. Quick Check:

   G80 cancels canned cycles = B [OK]

Hint: G80 always stops canned cycles safely [OK]

Common Mistakes:

• Thinking G80 starts a cycle
• Confusing G80 with spindle control
• Assuming G80 moves the tool

2. Which of the following is the correct syntax to cancel a canned cycle in CNC code?

easy

A. G81

B. G80

C. M30

D. G90

Solution

1. Step 1: Recall common G-codes for canned cycles

   G81 starts a drilling cycle, G90 sets absolute positioning, M30 ends the program.

2. Step 2: Identify the cancel command

   G80 is the standard code to cancel any active canned cycle.

3. Final Answer:

   G80 -> Option B

4. Quick Check:

   Cancel canned cycle = G80 = A [OK]

Hint: G80 is the cancel code, not G81 or M30 [OK]

Common Mistakes:

• Using G81 instead of G80
• Confusing M30 with cycle cancel
• Mixing positioning codes with cycle cancel

3. Given the CNC program snippet:

G81 X10 Y10 Z-5 R1 F100
G80
G00 X0 Y0

What will the G80 command do here?

medium

A. Cancel the drilling cycle started by G81

B. Move the tool rapidly to X10 Y10

C. Start a drilling cycle at X0 Y0

D. Set feed rate to 80

Solution

1. Step 1: Analyze the G81 command

   G81 starts a drilling canned cycle at X10 Y10 with depth Z-5.

2. Step 2: Understand the effect of G80

   G80 cancels the active canned cycle, stopping the drilling cycle.

3. Final Answer:

   Cancel the drilling cycle started by G81 -> Option A

4. Quick Check:

   G80 cancels G81 cycle = C [OK]

Hint: G80 always cancels previous canned cycles like G81 [OK]

Common Mistakes:

• Thinking G80 starts a cycle
• Confusing G80 with rapid move
• Misreading feed rate as cycle cancel

4. Identify the error in this CNC code snippet:

G81 X20 Y20 Z-10 F150
G00 X0 Y0
G80

medium

A. No error; code is correct

B. G00 cannot be used after G81

C. G80 must be used immediately after G81 to cancel

D. G80 should come before G00 move

Solution

1. Step 1: Understand the order of commands

   G81 starts drilling; G80 cancels it. Moves like G00 should happen after cancel.

2. Step 2: Check the code sequence

   Here, G00 rapid move happens before G80 cancels the cycle, which can cause unexpected behavior.

3. Final Answer:

   G80 should come before G00 move -> Option D

4. Quick Check:

   Cancel cycle before moves = A [OK]

Hint: Always cancel canned cycles before rapid moves [OK]

Common Mistakes:

• Placing G80 after moves
• Assuming G00 cancels cycles
• Ignoring command order importance

5. You have a CNC program that drills multiple holes using G81. After finishing, you want to safely move the tool to a new position without drilling. Which sequence correctly cancels the drilling cycle and moves the tool?

hard

A. G81 X30 Y30 Z-5 F120
G80
G00 X50 Y50

B. G00 X50 Y50
G81 X30 Y30 Z-5 F120
G80

C. G80
G81 X30 Y30 Z-5 F120
G00 X50 Y50

D. G81 X30 Y30 Z-5 F120
G00 X50 Y50
G80

Solution

1. Step 1: Recognize the need to cancel the drilling cycle

   After drilling with G81, G80 must be used to cancel the cycle before moving.

2. Step 2: Check the sequence of commands

   G81 X30 Y30 Z-5 F120 G80 G00 X50 Y50 cancels the cycle with G80 before moving rapidly with G00, which is correct.

3. Final Answer:

   G81 X30 Y30 Z-5 F120 G80 G00 X50 Y50 -> Option A

4. Quick Check:

   Cancel cycle then move = D [OK]

Hint: Cancel cycle (G80) before moving tool (G00) [OK]

Common Mistakes:

• Moving tool before canceling cycle
• Starting new cycle before cancel
• Placing G80 before starting cycle