Program end (M30) in CNC Programming - Mini Project: Build & Apply

Understanding Program End with M30 in CNC Programming

📖 Scenario: You are programming a CNC machine to cut a simple shape. After the cutting is done, the machine needs to stop and reset properly to be ready for the next job.

🎯 Goal: Learn how to use the M30 command to end a CNC program correctly.

📋 What You'll Learn

Create a CNC program with basic setup commands

Include a simple cutting move

Add the M30 command to end the program

💡 Why This Matters

🌍 Real World

CNC machines need a clear program end command to stop safely and prepare for the next job. M30 is the standard way to do this.

💼 Career

Knowing how to end CNC programs correctly is essential for CNC operators and programmers to avoid machine errors and ensure smooth production.

1

Create the initial CNC program setup

Write the first three lines of the CNC program to set the units to millimeters with G21, set absolute positioning with G90, and turn the spindle on clockwise with M03.

CNC Programming

# Write the first three lines: G21, G90, M03
# Your code here

Hint

Use G21 for millimeters, G90 for absolute positioning, and M03 to start the spindle clockwise.

2

Add a simple cutting move

Add a line to move the tool to position X50 Y50 at feed rate 100 using G01 X50 Y50 F100.

CNC Programming

G21
G90
M03
# Add a cutting move to X50 Y50 at feed 100
# Your code here

Hint

Use G01 for linear move, specify X and Y coordinates, and set feed rate with F100.

3

Add the program end command

Add the M30 command on a new line to end the CNC program and rewind it.

CNC Programming

G21
G90
M03
G01 X50 Y50 F100
# Add M30 to end the program
# Your code here

Hint

The M30 command stops the program and resets it for the next run.

4

Display the complete CNC program

Print the entire CNC program stored in a variable called program.

CNC Programming

program = '''G21
G90
M03
G01 X50 Y50 F100
M30'''
# Print the program
# Your code here

Hint

Use print(program) to show the full CNC program.