How to Cut Aluminum Composite Material on a Desktop CNC
wolfpawnaluminum compositedibondacmsignage
Aluminum Composite Material (ACM, Dibond) is a sandwich of two thin aluminum sheets around a plastic core. It machines cleanly on the Wolfpawn and is ideal for signs and panels.
What Makes ACM Good for Desktop CNC
- Total thickness typically 3mm (0.3mm aluminum + 2.4mm PE core + 0.3mm aluminum)
- The PE core absorbs vibration — much more forgiving than solid aluminum
- Can cut full depth in one or two passes
- Clean, professional finish
Recommended Settings
| Operation | Bit | RPM | Feed | DOC |
|---|---|---|---|---|
| Profile cut | 1/8" 2-flute upcut carbide | 8000 | 1000 mm/min | Full 3mm |
| Pocket/engrave | 1/8" 2-flute | 9000 | 1200 mm/min | 0.5–1 mm |
| V-carve text | 60° V-bit | 9000 | 1000 mm/min | Per vector width |
Hold-Down
ACM is thin and can flex:
- Double-sided tape across entire back surface
- Screws through corners for larger pieces
- Always check corners are fully seated before cutting
Cut Quality Tips
- Conventional milling for profile cuts — less tendency to peel the face
- Keep protective film on during cutting
- Air blast or vacuum chips — aluminum chips dull bits quickly when recut
- Tabs: 4mm wide × 0.5mm high (very thin since material is thin)
Drilling/Screw Holes
For mounting holes in ACM panels:
- Step drill for clean holes — standard twist drills tear the face
- Or CNC-drill with a 2-flute end mill at 1000 RPM, 200 mm/min plunge
Finishing
- Remove protective film after all cutting
- Clean with IPA
- Brush aluminum skins don't need finishing
- Can paint with rattle can adhesion promoter + automotive paint for color changes