Starrag Bumotec s191V

The Starrag Bumotec s191V is a vertical-configuration 5-axis multi-technology machining center from Starrag’s Swiss Bumotec division, optimized for complete machining of precision small parts from bar stock up to 50 mm diameter. The V designation distinguishes this model from the standard s191 by its vertical spindle orientation, which provides superior chip evacuation and ergonomic access for operators working with small, complex medical and watchmaking components.

The s191V offers X/Y/Z travels of 400 x 200 x 410 mm (15.7 x 7.9 x 16.1 in) with rapid traverse rates of 50 m/min and acceleration of 10.4 m/s² across all linear axes. The machining spindle delivers 8 kW standard (13 kW with the Plus option) at speeds up to 30,000 RPM, with a 40,000 RPM option. An ultra-high-speed 150,000 RPM HF spindle option enables ceramic machining. The HSK-A40 taper provides excellent rigidity-to-size ratio.

The turning spindle (C-axis) operates at up to 6,000 RPM with 15 kW of power and 41-68 Nm of torque, handling bar stock up to 50 mm diameter. The B-axis tilting range of -25 to -115 degrees enables full 5-axis simultaneous machining with configurations supporting up to 7 axes and three spindles. Tool capacity ranges from 30 to 90 positions with 3.4-second chip-to-chip times.

The s191V runs on a Fanuc 31i control with thermal stabilization as standard equipment. New machines typically price between $550,000 and $900,000. The s191V competes with the Willemin-Macodel 508MT2 and Citizen Cincom L series for complex small-part production.