G01 linear interpolation (cutting feed) in CNC Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the resulting tool path from this G01 command?

Given the CNC command G01 X50 Y25 F100, what is the final position of the tool after execution?

CNC Programming

N10 G01 X50 Y25 F100

A The tool moves in a straight line to X=25, Y=50 at feed rate 100

B The tool moves in a circular arc to X=50, Y=25 at feed rate 100

C The tool moves to X=100, Y=50 at feed rate 100

D The tool moves in a straight line to X=50, Y=25 at feed rate 100

💡 Hint

G01 means linear interpolation, so the tool moves straight to the specified coordinates.

G01 commands move the tool in a straight line to the specified X and Y coordinates at the given feed rate. Here, the tool moves to X=50, Y=25.

🧠 Conceptual

intermediate

What does the F word in a G01 command specify?

In the command G01 X100 Y100 F200, what does the F200 part control?

A The spindle speed, or rotation speed of the tool

B The feed rate, or speed at which the tool moves

C The coolant flow rate

D The tool diameter

💡 Hint

F is commonly used to set how fast the tool moves during cutting.

In CNC programming, F sets the feed rate, which is the speed the tool moves along the programmed path.

📝 Syntax

advanced

Which G01 command is syntactically correct for moving to X=30, Y=40 at feed 150?

Select the correct G01 command syntax to move the tool to X=30, Y=40 with feed rate 150.

A G01 X=30 Y=40 F=150

B G01 X30 Y40 Feed150

C G01 X30 Y40 F150

D G01 X30, Y40, F150

💡 Hint

Look for the standard CNC command format without extra symbols or words.

The correct syntax uses G01 followed by coordinates and feed rate without equal signs or commas.

🔧 Debug

advanced

Identify the error in this G01 command

What error will this command cause? G01 X50 Y F100

CNC Programming

G01 X50 Y F100

A Syntax error due to missing Y coordinate value

B No error, command runs correctly

C Feed rate error because F is too low

D Tool path error because X coordinate is missing

💡 Hint

Check if all coordinate values are complete.

The Y coordinate is missing a value, causing a syntax error in the command.

🚀 Application

expert

What is the total distance moved by the tool in this sequence?

Given these commands executed in order starting at X0 Y0:
G01 X30 Y0 F100
G01 X30 Y40 F100
Calculate the total linear distance the tool travels.

CNC Programming

N10 G01 X30 Y0 F100
N20 G01 X30 Y40 F100

A 70 units

B 30 units

C 40 units

D 50 units

💡 Hint

Add the distances of each linear move.

First move: from (0,0) to (30,0) = 30 units.
Second move: from (30,0) to (30,40) = 40 units.
Total = 30 + 40 = 70 units.

Practice

1. What does the G01 command do in CNC programming?

easy

A. Moves the tool rapidly without cutting

B. Changes the tool automatically

C. Stops the machine immediately

D. Moves the tool in a straight line at a controlled cutting speed

Solution

1. Step 1: Understand the purpose of G01

   The G01 command is used for linear interpolation, meaning it moves the tool in a straight line.

2. Step 2: Recognize the feed rate role

   G01 moves the tool at a set feed rate, which controls cutting speed, unlike rapid moves (G00).

3. Final Answer:

   Moves the tool in a straight line at a controlled cutting speed -> Option D

4. Quick Check:

   G01 = Linear cutting move [OK]

Hint: G01 means straight line move with cutting feed [OK]

Common Mistakes:

• Confusing G01 with rapid move G00
• Thinking G01 stops the machine
• Assuming G01 changes tools

2. Which of the following is the correct syntax for a G01 command to move to X=10, Y=5 at feed rate 150?

easy

A. G01 X10 Y5 150F

B. G01 X10 Y5 F150

C. G01 F150 X10 Y5

D. G01 X=10 Y=5 F=150

Solution

1. Step 1: Identify correct order and format

   The standard syntax places G01 first, followed by coordinates and feed rate with no equal signs.

2. Step 2: Check feed rate format

   Feed rate is specified as F followed by the number, no equal sign or reversed order.

3. Final Answer:

   G01 X10 Y5 F150 -> Option B

4. Quick Check:

   Correct G01 syntax = G01 X10 Y5 F150 [OK]

Hint: Coordinates then feed rate, no equal signs [OK]

Common Mistakes:

• Using equal signs (=) in commands
• Placing feed rate before coordinates incorrectly
• Writing feed rate as number then F

3. What is the result of this CNC code snippet?

G01 X20 Y10 F100
G01 X30 Y10

medium

A. Moves to (20,10) at default feed, then moves to (30,10) at feed 100

B. Moves to (20,10) at feed 100, then moves to (30,10) at default feed

C. Moves to (20,10) at feed 100, then moves to (30,10) at feed 100

D. Syntax error due to missing feed rate in second line

Solution

1. Step 1: Analyze first line

   G01 moves to X20 Y10 at feed rate 100, setting feed rate for subsequent moves.

2. Step 2: Analyze second line

   Second G01 moves to X30 Y10 without feed rate, so it uses the last set feed rate 100.

3. Final Answer:

   Moves to (20,10) at feed 100, then moves to (30,10) at feed 100 -> Option C

4. Quick Check:

   Feed rate persists until changed = Moves to (20,10) at feed 100, then moves to (30,10) at feed 100 [OK]

Hint: Feed rate stays until changed explicitly [OK]

Common Mistakes:

• Assuming feed rate resets each line
• Thinking missing feed causes error
• Confusing feed rate with rapid move

4. Identify the error in this CNC code:

G01 X50 Y25 F200
G01 X60 Y30 F

medium

A. Missing feed rate value after F in second line

B. Coordinates are invalid

C. G01 command cannot be repeated twice

D. Feed rate must be before coordinates

Solution

1. Step 1: Check second line syntax

   The second line has 'F' with no number after it, which is invalid syntax.

2. Step 2: Validate other parts

   Coordinates are valid, G01 can repeat, and feed rate can come after coordinates.

3. Final Answer:

   Missing feed rate value after F in second line -> Option A

4. Quick Check:

   F must have a number after it [OK]

Hint: F must always have a number after it [OK]

Common Mistakes:

• Ignoring missing feed rate value
• Thinking feed rate order matters
• Assuming repeated G01 is wrong

5. You want to cut a straight line from (0,0) to (50,50) with feed rate 120, then move rapidly to (0,0). Which code sequence is correct?

hard

A. G01 X50 Y50 F120
G00 X0 Y0

B. G00 X50 Y50 F120
G01 X0 Y0

C. G01 X50 Y50
G00 X0 Y0 F120

D. G01 X50 Y50 F120
G01 X0 Y0 F0

Solution

1. Step 1: Use G01 for cutting move

   Cutting move with feed rate 120 requires G01 to move from (0,0) to (50,50).

2. Step 2: Use G00 for rapid move back

   Rapid move back to (0,0) uses G00 without feed rate.

3. Final Answer:

   G01 X50 Y50 F120 G00 X0 Y0 -> Option A

4. Quick Check:

   Cut with G01, rapid with G00 [OK]

Hint: Cut with G01, rapid return with G00 [OK]

Common Mistakes:

• Using G00 for cutting moves
• Setting feed rate on rapid moves
• Using feed rate zero to stop feed