Citizen Miyano BNA-42GTY

The Citizen Miyano BNA-42GTY is the most versatile machine in the BNA-42 family, combining a dual-spindle architecture with a turret, gang tool post, and dual Y-axes for up to 45 tool positions and 3-tool simultaneous cutting from 42 mm bar stock. The GTY designation — Gang Tool, Turret, Y-axis — signals maximum tooling density and minimum cycle times on complex small parts.

The main spindle (SP1) reaches 6,000 RPM with 11/7.5 kW (15/10 hp), while the sub-spindle (SP2) runs to 5,000 RPM with 5.5/3.7 kW (7.5/5 hp). Bar capacity is 42 mm on the main spindle and 34 mm on the sub-spindle. The 8-station turret with half-indexing serves the main spindle, while a gang tool post mounted opposite provides turning and revolving tool positions. A separate back ID tool station holds tools for sub-spindle internal machining.

The machine features 9 controlled axes with generous travels. Rapid traverse rates reach 30 m/min on Z1 and Y1, 24 m/min on X1, 20 m/min on Z2 and X2, and 12 m/min on Y2, Z3, and X3. The dual Y-axes provide 260 mm on Y1 and 70 mm on Y2 for exceptional off-center machining range on both turret and sub-spindle sides. Maximum machining length is 100 mm per chucking.

At 3,750 kg with a floor space of 2,350 x 1,475 mm and machine height of 1,680 mm, the BNA-42GTY maintains a remarkably compact footprint for its 9-axis, 3-tool simultaneous cutting capability. LFV (Low Frequency Vibration) chip-breaking technology is available for reliable unattended production in difficult materials like stainless steel and titanium.

The 3-tool simultaneous cutting is the GTY's signature feature. The turret, gang tool post, and sub-spindle tools can all cut simultaneously, overlapping operations that would run sequentially on simpler machines. Medical implant components with 20+ features, aerospace connectors with cross-holes at multiple angles, and electronic housings with complex milled profiles are typical applications where the GTY's capability eliminates secondary operations entirely.