Coolant control (M08, M09) in CNC Programming - Mini Project: Build & Apply

Coolant Control with M08 and M09 Commands

📖 Scenario: You are programming a CNC machine that uses coolant to keep tools cool during cutting. The machine uses M08 to turn the coolant on and M09 to turn it off.Proper coolant control helps the machine work better and keeps tools safe.

🎯 Goal: Write a simple CNC program that turns the coolant on before cutting and turns it off after cutting.

📋 What You'll Learn

Create a variable called program that holds a list of CNC commands as strings.

Add a variable called cutting_commands with the cutting moves.

Use M08 to turn coolant on before cutting commands.

Use M09 to turn coolant off after cutting commands.

Print the full CNC program commands line by line.

💡 Why This Matters

🌍 Real World

CNC machines need coolant control commands to protect tools and improve cutting quality.

💼 Career

Understanding how to script CNC programs with coolant commands is essential for CNC programmers and machinists.

1

Create the initial CNC program commands list

Create a list called program with these exact strings: "G21" (set units to millimeters) and "G90" (set absolute positioning).

CNC Programming

# Create the list called program with G21 and G90
# Your code here

Hint

Use square brackets [] to create a list with the two strings inside.

2

Add cutting commands to a separate list

Create a list called cutting_commands with these exact strings: "G01 X50 Y50 F100" and "G01 X100 Y100 F100" representing cutting moves.

CNC Programming

program = ["G21", "G90"]
# Create the list called cutting_commands with two cutting moves
# Your code here

Hint

Remember to use square brackets and put each command as a string inside the list.

3

Add coolant on and off commands around cutting moves

Add "M08" (coolant on) to the program list before the cutting_commands, and add "M09" (coolant off) after the cutting_commands. Use list concatenation to combine them all into program.

CNC Programming

program = ["G21", "G90"]
cutting_commands = ["G01 X50 Y50 F100", "G01 X100 Y100 F100"]
# Add M08 before cutting_commands and M09 after, then combine all into program
# Your code here

Hint

Use the plus sign + to join lists: original program, then ["M08"], then cutting_commands, then ["M09"].

4

Print the full CNC program commands

Use a for loop with variable line to iterate over program and print each line exactly as it is.

CNC Programming

program = ["G21", "G90"]
cutting_commands = ["G01 X50 Y50 F100", "G01 X100 Y100 F100"]
program = program + ["M08"] + cutting_commands + ["M09"]
# Print each line in program using a for loop
# Your code here

Hint

Use for line in program: and then print(line) inside the loop.