Citizen Miyano BND-51SY

The Citizen Miyano BND-51SY is a dual-spindle, single-turret fixed-headstock CNC turning center that steps up to 51 mm bar capacity for shops needing more material diameter than the 42 mm BNA platform. The SY configuration provides a sub-spindle and Y-axis milling capability, delivering complete front-and-back machining of bar stock in a single cycle with live tooling for cross-drilling, milling, and tapping.

The main spindle reaches 5,000 RPM with 15/11 kW (20/15 hp) of power — a significant step up from the BNA-42 series' 11/7.5 kW motors. The sub-spindle also runs to 5,000 RPM. The extra spindle power is essential for efficient material removal at the larger 51 mm bar diameter, especially when roughing steel and stainless components. Maximum machining length of 320 mm is substantially longer than the BNA-42's 100 mm, opening the machine to shaft-type components and longer fittings.

The 12-station turret accepts live tools at all 12 positions with 5,000 RPM rotary tool speed. Y-axis travel of 75 mm (+40/-35 mm) provides off-center machining capability. Axis travels measure 175 mm on X, 435 mm on Z1, and 530 mm on the sub-spindle Z2 axis, with rapid traverse at 20 m/min. The generous Z2 travel of 530 mm enables the sub-spindle to pick up parts and retract with plenty of clearance for backworking operations.

At 4,500 kg and built on a wider bed than the BNA-42 platform, the BND-51SY delivers the rigidity needed for interrupted cuts and heavier roughing at the larger bar diameter. The machine handles both collet and 6-inch power chuck workholding. Rated power consumption is moderate for its size class, keeping operating costs reasonable for two-shift production.

The BND-51SY fills the gap between the compact BNA-42 series and the larger BNE/BNJ twin-turret machines. It's the right machine for shops that have outgrown 42 mm capacity but don't need the complexity and cost of a twin-turret platform. Typical applications include larger hydraulic fittings, automotive transmission components, oil and gas connectors, and industrial valve bodies.

Direct competitors include the Nakamura-Tome SC-300 and the Tsugami B0656-III. The BND-51SY's combination of 320 mm machining length, 15/11 kW spindle power, and 12-position all-live turret with Y-axis makes it competitive in the mid-size fixed-headstock mill-turn segment.