Citizen Miyano BND-51SY2
Key Specifications
X Travel
Rapid Traverse
max bar capacity
max machining length
main spindle speed
main spindle power
Overview
The Citizen Miyano BND-51SY2 is the second-generation update to the BND-51SY, featuring refined thermal compensation and updated Fanuc 0i-TF Plus control. It 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.
Full Specifications
| Parameter | Value |
|---|---|
| Max Bar Capacity | 51 mm (2.0 in) |
| Max Machining Length | 320 mm (12.60 in) |
| Main Spindle Speed | 50 - 5,000 RPM |
| Main Spindle Power | 15/11 kW (20/15 hp) 30-min/continuous |
| Sub Spindle Speed | 5,000 RPM |
| Turret Stations | 12 |
| Live Tool Stations | 12 |
| Live Tool Speed | 5,000 RPM |
| X-Axis Travel | 175 mm (6.89 in) |
| Travel Z1 | 435 mm (17.13 in) |
| Travel Z2 | 530 mm (20.87 in) |
| Y Axis Travel | 75 mm (+40/-35 mm) |
| Rapid Traverse Rate | 20 m/min (787 ipm) |
| Chuck Size | 6 in power chuck |
| Machine Weight | Approx. |
| CNC Control | Fanuc 0i-TF Plus |
| Maximum Machining Length | Bar |
| Slide Stroke | X axis |
| Z Axis | 435mm |
| Y Axis | +40mm/-35mm |
| B Axis | 530mm |
Specifications sourced from citizenmachinery.co.uk — verified 2026-03-28
Strengths & Limitations
Strengths
- 51 mm bar capacity with 15/11 kW spindle power handles larger components that exceed the 42 mm BNA platform's range, with enough torque for aggressive roughing in steel and stainless
- 320 mm maximum machining length is over three times the BNA-42's 100 mm, enabling shaft-type components, longer fittings, and parts that would be impossible on smaller machines
- All 12 turret stations accept live tools, providing maximum tooling flexibility without sacrificing turning positions to static-only stations
- 530 mm sub-spindle Z2 travel provides generous clearance for part pickup and backworking operations, reducing interference concerns with long parts
- Y-axis travel of 75 mm enables off-center milling for flats, keyways, hexagonal profiles, and other features requiring tool offset from the spindle centerline
- Proven BND platform has been refined over multiple generations with a focus on rigidity and thermal stability for tight-tolerance production
Limitations
- 5,000 RPM maximum spindle speed is lower than the BNA-42's 6,000 RPM, which can limit surface finish quality on small-diameter aluminum parts where high speed matters
- Single turret shared between two spindles limits simultaneous machining capability compared to twin-turret platforms like the BNE-51MSY or BNJ-51SY
- 4,500 kg weight and larger footprint require more substantial foundations and rigging compared to the compact BNA-42 series
- No LFV chip-breaking technology on this platform, which can be a concern for unattended production of stainless steel and titanium at the 51 mm bar size
- Higher acquisition cost than the BNA-42SY without adding the twin-turret flexibility of the more expensive BNE and BNJ machines
Best For
Frequently Asked Questions
01
New BND-51SY machines typically range from $180,000 to $260,000 depending on tooling configuration, high-pressure coolant, bar feeder, and automation options. Used BND-51SY machines from 2012-2020 trade between $70,000 and $160,000 depending on hours, spindle condition, and included tooling. The 51 mm platform commands a significant premium over the 42 mm BNA series.
02
The BNJ-51SY is a twin-turret machine with a 12-station main turret and 8-station sub turret, enabling true simultaneous independent machining on both spindles. The BND-51SY has a single turret with superimposition control. The BNJ is faster on complex parts with heavy backworking but costs $50,000-$80,000 more. Choose the BND for simpler parts and lower budget; choose the BNJ when backworking complexity justifies the twin-turret investment.
03
Common bar feeder pairings include the LNS Quick Load Servo 80, Edge FMB Turbo 5-65, and Iemca Master 80. Choose a magazine-style loader for production runs and a hydrodynamic loader for tighter roundness tolerance requirements. The 51 mm capacity requires a feeder rated for at least 2-inch bar stock.
04
Yes. The BND-51SY supports both collet chucks (Hardinge or DIN standard) and 6-inch hydraulic power chucks. Collets are preferred for bar work requiring high concentricity and fast changeover, while power chucks handle castings, forgings, and irregular blanks. Most shops keep both options available for maximum flexibility.
05
The maximum bar capacity is 51 mm through the spindle bore. With a 6-inch power chuck, the machine can swing larger diameters for chucker-type work on pre-cut blanks and castings, though the practical turning diameter depends on turret clearance and toolholder configuration.
06
The 320 mm maximum machining length is supported by the generous 435 mm Z1 travel and 530 mm Z2 sub-spindle travel. For longer parts, the sub-spindle can act as a tailstock-style support during main spindle machining before picking up the part for backworking. Bar feeder integration handles continuous feeding of long bar stock for high-volume production.
Videos
Citizen Machinery UK
CNC Digital, Inc.
WDS Components Ltd
Automatics & Machinery
MachinesUsed
Community Discussions
Community discussion — I took your advice and bought a Mitutoyo : r/Machinists - Reddit
Community discussion — Real or fake? Mitutoyo calipers : r/Machinists - Reddit
Community discussion — Fake Mitutoyos? Please help! : r/Machinists - Reddit
Pricing and buying discussion — Opinions on B-Tier Digital Caliper Brands : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
Related Machines
Mazak Integrex i-200
Okuma Multus B250II
DMG Mori CTX gamma 2000 TC
DMG Mori NTX 2000
DN Solutions SMX 3100ST
