The Sienci Labs AltMill 4×4 is a high-performance CNC router that brings industrial-level technologies to a prosumer price point. Built on a rigid aluminum frame with HGR15 linear guides and ball screws on all axes, the AltMill delivers exceptional precision and rigidity for both hobby and production-level work.
The machine features closed-loop NEMA 23 stepper motors on all three axes, which auto-correct positioning and auto-stop when unexpected resistance is encountered, preventing crashes and ruined workpieces. Cutting speeds reach approximately 600 inches per minute with 10,000 mm/min rapids.
This AltMill is equipped with a Sienci 1.5kW 80mm air-cooled spindle running up to 24,000 RPM with ER16 collets. The spindle is controlled via a VFD (variable frequency drive) unit, allowing automated speed control and quieter operation compared to trim routers.
The machine cuts a wide range of materials including hardwoods, softwoods, MDF, plywood, plastics, acrylic, foams, composites, and aluminum. With proper tooling and feeds/speeds, even steel can be machined. The working area is approximately 49 by 49 inches with a Z-axis travel of approximately 6.8 inches.
The AltMill is controlled using gSender, Sienci Labs' free CNC control software, running on the adjacent computer. Designs are created and toolpaths generated using VCarve CAM software. Reservation is required before use.