G82 spot drilling with dwell in CNC Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a spot drilling cycle with dwell time.

CNC Programming

G82 X10 Y20 Z-5 R2 F100 [1]

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

AG00

BM03

CP3

DS1500

Attempts:

3 left

💡 Hint

Common Mistakes

Using G00 which is a rapid move command, not dwell time.

Using M03 which starts the spindle, not dwell time.

Using S1500 which sets spindle speed, not dwell time.

The P word sets the dwell time in seconds for G82 spot drilling cycles.

2fill in blank

medium

Complete the code to specify the retract height for the spot drilling cycle.

CNC Programming

G82 X15 Y25 Z-6 [1] F120 P2

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

AR3

BR5

CZ3

DP2

Attempts:

3 left

💡 Hint

Common Mistakes

Using Z3 which is a depth coordinate, not retract height.

Using P2 which is dwell time, not retract height.

Using R5 which is a wrong retract height for this code.

The R word sets the retract height above the part surface for G82 cycles.

3fill in blank

hard

Fix the error in the spot drilling code by completing the missing dwell time parameter.

CNC Programming

N10 G82 X20 Y30 Z-7 R4 F150 [1]

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

AP1

BP5

CP0

DP-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using P0 which means no dwell time.

Using P-1 which is invalid negative dwell time.

Using P1 which is valid but shorter than intended.

P5 sets a 5-second dwell time, which is a valid positive value for G82.

4fill in blank

hard

Fill both blanks to complete the spot drilling cycle with correct dwell and feed rate.

CNC Programming

G82 X25 Y35 Z-8 R[1] F[2] P4

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

A2

B100

C150

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping retract height and feed rate values.

Using retract height too large or feed rate too slow.

R2 sets the retract height and F150 sets the feed rate for the drilling cycle.

5fill in blank

hard

Fill all three blanks to create a spot drilling cycle with dwell, retract height, and feed rate.

CNC Programming

N20 G82 X30 Y40 Z-9 R[1] F[2] P[3]

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

A3

B120

C6

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of parameters.

Using zero or negative values for dwell or retract height.

R4 is retract height, F120 is feed rate, and P6 is dwell time in seconds.

Practice

1. What is the main purpose of the G82 command in CNC programming?

easy

A. To set the spindle speed

B. To move the tool rapidly without cutting

C. To perform spot drilling with a dwell pause at the bottom of the hole

D. To cancel all canned cycles

Solution

1. Step 1: Understand the function of G82

   G82 is used for spot drilling, which means drilling with a pause (dwell) at the bottom to improve hole quality.

2. Step 2: Compare with other options

   Other options describe different commands: rapid move (G0), cancel cycle (G80), spindle speed (S code), so they are incorrect.

3. Final Answer:

   To perform spot drilling with a dwell pause at the bottom of the hole -> Option C

4. Quick Check:

   G82 = Spot drilling with dwell [OK]

Hint: G82 always drills with a pause at the bottom [OK]

Common Mistakes:

• Confusing G82 with G80 (cancel cycle)
• Thinking G82 is for rapid moves
• Mixing G82 with spindle speed commands

2. Which of the following is the correct syntax for a G82 spot drilling cycle with a dwell time of 2 seconds at position X10 Y5 and depth Z-5?

easy

A. G82 X10 Y5 Z-5 F100 P2 R1

B. G82 X10 Y5 Z-5 P2 R1 F100

C. G82 X10 Y5 Z-5 R1 F100

D. G82 X10 Y5 Z-5 R1 P2 F100

Solution

1. Step 1: Identify correct parameter order for G82

   The standard order is: G82 X Y Z R P F where R is retract height, P is dwell time, F is feed rate.

2. Step 2: Check each option

   G82 X10 Y5 Z-5 R1 P2 F100 follows correct order and includes all required parameters. Options A and B swap P and R order, which may cause errors. G82 X10 Y5 Z-5 R1 F100 misses P (dwell time).

3. Final Answer:

   G82 X10 Y5 Z-5 R1 P2 F100 -> Option D

4. Quick Check:

   Correct G82 syntax = G82 X10 Y5 Z-5 R1 P2 F100 [OK]

Hint: Remember order: X Y Z R (retract) P (pause) F (feed) [OK]

Common Mistakes:

• Swapping P and R parameters
• Omitting dwell time P
• Incorrect parameter order causing syntax errors

3. What will be the tool behavior for the following CNC code snippet?

G82 X20 Y10 Z-8 R2 P3 F80
G80

medium

A. The tool moves rapidly to X20 Y10 without drilling

B. The tool drills to Z-8 at X20 Y10, dwells 3 seconds, retracts to 2, then cancels cycle

C. The tool drills to Z-8 without dwell and retracts to 3

D. The tool drills to Z-8, dwells 2 seconds, retracts to 3, then cancels cycle

Solution

1. Step 1: Interpret G82 parameters

   X20 Y10 is position, Z-8 is drill depth, R2 is retract height, P3 is dwell time in seconds, F80 is feed rate.

2. Step 2: Understand G80 effect

   G80 cancels canned cycles after G82 completes.

3. Final Answer:

   The tool drills to Z-8 at X20 Y10, dwells 3 seconds, retracts to 2, then cancels cycle -> Option B

4. Quick Check:

   G82 drills with dwell and retract, G80 cancels cycle [OK]

Hint: P is dwell seconds, R is retract height in G82 [OK]

Common Mistakes:

• Confusing R and P values
• Ignoring G80 cancels cycle
• Assuming no dwell happens

4. Identify the error in this G82 spot drilling command:

G82 X15 Y10 Z-6 P2 F100

medium

A. Missing retract height (R) parameter

B. Dwell time (P) cannot be used with G82

C. Feed rate (F) must come before Z depth

D. X and Y coordinates are not allowed with G82

Solution

1. Step 1: Check required parameters for G82

   G82 requires R (retract height) to know how far to pull up after drilling.

2. Step 2: Analyze given command

   The command lacks R parameter, so the machine won't know retract height, causing error.

3. Final Answer:

   Missing retract height (R) parameter -> Option A

4. Quick Check:

   G82 needs R parameter for retract [OK]

Hint: Always include R (retract) with G82 [OK]

Common Mistakes:

• Omitting R parameter
• Misplacing feed rate F
• Thinking dwell P is optional

5. You want to drill three holes at positions X5 Y5, X10 Y5, and X15 Y5 using G82 with a dwell of 1.5 seconds, depth Z-4, retract height R1, and feed rate F60. Which of the following code snippets correctly applies G82 for all three holes and cancels the cycle afterward?

hard

A. G82 X5 Y5 Z-4 R1 P1.5 F60\nG82 X10 Y5 Z-4 R1 P1.5 F60\nG82 X15 Y5 Z-4 R1 P1.5 F60\nG80

B. G82 X5 Y5 Z-4 R1 P1.5 F60\nG82 X10 Y5\nG82 X15 Y5\nG80

C. G82 X5 Y5 Z-4 R1 P1.5 F60\nX10 Y5\nX15 Y5\nG80

D. G82 X5 Y5 Z-4 R1 P1.5 F60\nG80\nG82 X10 Y5 Z-4 R1 P1.5 F60\nG82 X15 Y5 Z-4 R1 P1.5 F60

Solution

1. Step 1: Understand G82 cycle behavior

   G82 must be repeated with full parameters for each hole position unless modal commands are supported, which is not guaranteed.

2. Step 2: Analyze each option

   G82 X5 Y5 Z-4 R1 P1.5 F60\nG82 X10 Y5\nG82 X15 Y5\nG80 repeats G82 but omits parameters for second and third holes, which may cause errors. G82 X5 Y5 Z-4 R1 P1.5 F60\nX10 Y5\nX15 Y5\nG80 lacks G82 before second and third holes. G82 X5 Y5 Z-4 R1 P1.5 F60\nG80\nG82 X10 Y5 Z-4 R1 P1.5 F60\nG82 X15 Y5 Z-4 R1 P1.5 F60 cancels cycle (G80) too early. G82 X5 Y5 Z-4 R1 P1.5 F60\nG82 X10 Y5 Z-4 R1 P1.5 F60\nG82 X15 Y5 Z-4 R1 P1.5 F60\nG80 repeats full G82 command for each hole and cancels cycle at end, which is correct.

3. Final Answer:

   G82 X5 Y5 Z-4 R1 P1.5 F60 G82 X10 Y5 Z-4 R1 P1.5 F60 G82 X15 Y5 Z-4 R1 P1.5 F60 G80 -> Option A

4. Quick Check:

   Repeat full G82 per hole, then G80 to cancel [OK]

Hint: Repeat full G82 for each hole, then end with G80 [OK]

Common Mistakes:

• Omitting parameters on repeated G82 lines
• Cancelling cycle too early with G80
• Assuming parameters carry over without repetition