Tool change command (M06) in CNC Programming

Introduction

The M06 command tells the CNC machine to change the tool. This helps the machine use the right tool for different parts of the job.

When you need to switch from a drill bit to a milling cutter during a job.

When the current tool is worn out and needs replacement.

When the program requires different tools for different operations.

When setting up the machine for a new part that needs a different tool.

When automating a sequence of machining steps with multiple tools.

Syntax

CNC Programming

M06 T[number]

M06 is the command to change the tool.

T[number] specifies which tool number to load, for example T03 for tool 3.

Examples

Change to tool number 1.

CNC Programming

M06 T01

Change to tool number 12.

CNC Programming

M06 T12

Sample Program

This program sets absolute positioning (G90) and work offset (G54), changes to tool 3 (M06 T03), moves to X0 Y0, starts spindle clockwise at 1000 RPM (M03 S1000), moves down to Z-5 at feed 100 (G01 Z-5 F100), stops spindle (M05), and ends the program (M30).

CNC Programming

N10 G90 G54
N20 M06 T03
N30 G00 X0 Y0
N40 M03 S1000
N50 G01 Z-5 F100
N60 M05
N70 M30

Important Notes

Always make sure the tool number matches the tool loaded in the machine's tool holder.

Some CNC machines pause after M06 to allow manual tool change if automatic changer is not available.

Use M06 only when a tool change is needed; unnecessary tool changes waste time.

Summary

M06 command changes the tool in the CNC machine.

Use T[number] to specify which tool to load.

Tool changes help the machine perform different operations efficiently.