Willemin-Macodel 301S

The Willemin-Macodel 301S is a compact 5-axis turn-mill machining center purpose-built for the complete machining of small, geometrically complex parts in a single setup. Developed by the Swiss precision manufacturer Willemin-Macodel, the 301S targets industries where part complexity and dimensional accuracy leave no room for re-chucking errors or sequential setups — primarily medical devices, watchmaking, dental, and aerospace instrumentation.

At the core of the 301S is a high-speed spindle system combined with a fully simultaneous 5-axis kinematic that enables complex multi-face machining, undercuts, and inclined features that conventional turn-mill centers cannot reach without repositioning. The machine's compact footprint belies its functional scope: a workpiece small enough to fit within the 301S's working envelope can typically be completed entirely in one setup, from raw bar stock to finished part, with all turning, milling, drilling, boring, and threading operations performed without interruption.

Willemin-Macodel's Swiss engineering heritage is evident in the machine's construction. The 301S uses a thermally symmetric structure with active thermal compensation to minimize the dimensional drift that degrades accuracy during long production runs. Precision linear and rotary axes use direct-drive motors and high-resolution encoders to achieve positioning accuracies demanded by the watchmaking and medical sectors the machine primarily serves.

The 301S is particularly effective for parts that would traditionally require multiple specialized machines — a Swiss-type lathe for the turning operations, a 5-axis machining center for complex milled features, and secondary operations for rear face work. By consolidating all of these into a single setup on the 301S, manufacturers eliminate inter-operation variation, reduce work-in-progress inventory, and compress lead times dramatically. For complex small parts in high-value materials, the 301S represents a compelling productivity argument.