How to CNC Machine Titanium: Tips and Example G-code

To CNC machine titanium, use low cutting speeds, high feed rates, and rigid tooling to manage heat and tool wear. Employ coolant and sharp carbide tools with proper G-code commands to ensure smooth cutting and avoid work hardening.

Syntax

Basic G-code commands for CNC machining titanium include:

• G01: Linear cutting move
• F: Feed rate (mm/min or inches/min)
• S: Spindle speed (RPM)
• M08: Coolant ON
• M09: Coolant OFF
• T: Tool selection

Use low spindle speeds (S) and high feed rates (F) to reduce heat and tool wear. Coolant commands (M08, M09) help keep the titanium cool during cutting.

gcode

T1 M06 ; Select tool 1 and change
S300 M03 ; Set spindle speed to 300 RPM and start spindle clockwise
M08 ; Turn coolant ON
G01 X50 Y50 F200 ; Linear move at feed rate 200 mm/min
M09 ; Turn coolant OFF
M05 ; Stop spindle
M30 ; End program

Example

This example shows a simple G-code program to mill a square pocket in titanium using low spindle speed, high feed rate, and coolant.

gcode

T1 M06 ; Tool change to tool 1 (carbide end mill)
S250 M03 ; Spindle on clockwise at 250 RPM
M08 ; Coolant ON
G00 X0 Y0 Z5 ; Rapid move to start position above work
G01 Z-2 F100 ; Plunge into material at 100 mm/min
G01 X50 F300 ; Cut along X axis at 300 mm/min
G01 Y50 F300 ; Cut along Y axis at 300 mm/min
G01 X0 F300 ; Cut back along X axis at 300 mm/min
G01 Y0 F300 ; Cut back along Y axis at 300 mm/min
G00 Z5 ; Retract tool
M09 ; Coolant OFF
M05 ; Stop spindle
M30 ; End program

Common Pitfalls

Common mistakes when CNC machining titanium include:

• Using too high spindle speeds causing excessive heat and tool wear.
• Too slow feed rates leading to work hardening and tool breakage.
• Not using coolant, which causes overheating and poor surface finish.
• Using dull or incorrect tooling that cannot handle titanium's toughness.

Always balance spindle speed and feed rate, use sharp carbide tools, and keep coolant flowing.

gcode

Wrong approach:
S1500 M03 ; Too high spindle speed
F50 ; Too slow feed rate
M09 ; No coolant

Correct approach:
S300 M03 ; Low spindle speed
F300 ; High feed rate
M08 ; Coolant ON

Quick Reference

Tips for CNC machining titanium:

• Spindle speed: 200-400 RPM
• Feed rate: 200-400 mm/min
• Use sharp carbide tools
• Apply coolant continuously
• Use rigid fixturing to reduce vibration
• Take light cuts to avoid work hardening

Key Takeaways

Use low spindle speeds and high feed rates to reduce heat and tool wear when machining titanium.

Always apply coolant to keep the material and tool cool during cutting.

Use sharp carbide tools and rigid fixturing to improve surface finish and tool life.

Avoid slow feeds and high speeds to prevent work hardening and tool breakage.

Take light cuts and monitor tool condition regularly.