I cut almost exclusively aluminum and I only use Amana or Carbide 3D ZrN coated single flutes. From experience, I can say it is the most reliable way to cut without having to be absolutely perfect with your tool pathing and feeds & speeds. Winston explains why single flutes are a really good option for desktop class CNC’s when cutting aluminum.
The short explanation is this:
- Single flutes are incredibly hard to clog with chips and start smearing aluminum rather than cutting it
- There is less tool pressure when using a single flute vs a 2 or 3 flute. This means less power and rigidity is required to get a good cut.
Cutting the shiny stuff is very doable on the Shapeoko 3, there is just limited room for error. I avoid slotting at almost all cost and make heavy use of adaptive tool paths. If you break a tool while cutting aluminum, I can almost guarantee it was because of chip welding. @Vince.Fab made a video over on NYC CNC that is longer but is also very good: