Citizen Miyano BNE-51MSY

$320,000 - $450,000 Updated 2025-03-15

Key Specifications

Rapid Traverse

18 - 20 m/min

Spindle Power

SP1

max bar capacity sp1

51 mm (2.0 in)

max bar capacity sp2

51 mm (2.0 in)

max machining length

90 mm (3.54 in)

main spindle speed

5,000 RPM

Overview

The Citizen Miyano BNE-51MSY is a dual-spindle, twin-turret fixed-headstock CNC turning center with enhanced milling capability that represents the high end of Miyano's 51 mm platform. With twin 12-station turrets providing 24 tool positions, a dedicated third axis group (X3/Z3) for independent sub-spindle motion, and 2.2 kW (20 Nm) rotary tool motors on both turrets, the BNE-51MSY is built for the most complex parts in the 51 mm class.

Both spindles reach 5,000 RPM with the main spindle powered by a 15/11 kW (20/15 hp) motor and the sub-spindle by 7.5/5.5 kW (10/7.5 hp). Both spindles accept 51 mm bar stock — no sub-spindle diameter restriction. The symmetry in bar capacity eliminates the backworking limitations found on machines with smaller sub-spindles, enabling full-diameter operations on both ends of the part.

The twin 12-station turrets (HD1 and HD2) each accept up to 12 live tools running at 6,000 RPM. The standard rotary tool motor delivers 2.2 kW (20 Nm), with an optional 4.0 kW (25 Nm) upgrade available for shops needing even more milling power. Y-axis travel of 80 mm (+/-40 mm) on HD1 enables off-center machining. The third axis group (X3: 155 mm, Z3: 450 mm) provides independent sub-spindle motion for 3-tool simultaneous cutting — upper turret, lower turret, and sub-spindle operations all running independently.

Axis travels on HD1 measure 195 mm on X1, 380 mm on Z1, and 80 mm on Y1. HD2 provides 195 mm on X2 and 175 mm on Z2. Rapid traverse rates hit 18-20 m/min across axes. Maximum machining length is 90 mm. At 8,000 kg with a floor space of 2,725 x 2,159 mm, the BNE-51MSY is a substantial production machine.

The superimposition control enables sophisticated multi-tool cutting sequences: up to 3 tools can cut simultaneously through independent control of the upper turret, lower turret, and sub-spindle axes. This capability can reduce cycle times by 40-60% on complex parts with balanced front-and-back workload compared to single-turret machines.

The BNE-51MSY is the machine of choice for shops running the most demanding parts in the 51 mm fixed-headstock class. It competes with premium twin-turret turning centers from Nakamura-Tome, Star, and Tsugami. Medical implant manufacturers, aerospace fitting producers, and high-volume automotive component shops are primary users. The combination of twin 12-station turrets, 51 mm bar capacity on both spindles, and 3-tool simultaneous cutting makes it one of the most capable fixed-headstock turning centers in its size class.

Full Specifications

Parameter	Value
Max Bar Capacity Sp1	51 mm (2.0 in)
Max Bar Capacity Sp2	51 mm (2.0 in)
Max Machining Length	90 mm (3.54 in)
Main Spindle Speed	5,000 RPM
Main Spindle Power	15/11 kW (20/15 hp)
Sub Spindle Speed	5,000 RPM
Sub Spindle Power	7.5/5.5 kW (10/7.5 hp)
Upper Turret Stations	12
Lower Turret Stations	12
Total Live Tool Positions	24
Live Tool Speed	6,000 RPM
Live Tool Power	2.2 kW (20 Nm), 4.0 kW (25 Nm) optional
Travel X1	195 mm (7.68 in)
Travel Z1	380 mm (14.96 in)
Travel Y1	80 mm (+/-40 mm)
Travel X2	195 mm (7.68 in)
Travel Z2	175 mm (6.89 in)
Travel X3	155 mm (6.10 in)
Travel Z3	450 mm (17.72 in)
Rapid Traverse Rate	18 - 20 m/min
Rapid Traverse Y	12 m/min (472 ipm)
Machine Weight	8,000kg
Floor Space	2,725×2,159mm
Power Consumption	44 kVA
CNC Control	Mitsubishi CNC
Items	BNE-51MSY
Maximum Machining Diameter Of Bar Work	SP1
Sp2	7.5/5.5kW
Maximum Machining Length	90mm
Type Of Turret	HD1
Hd2	12
Slide Stroke	HD1
Z1 Axis	380mm
Y1 Axis	80(±40) mm
Z2 Axis	175mm
Z3 Axis	450mm
Shank Height Of Square Turning Tool	20mm Sq.
Tool Hole Diameter	25mm Dia.
Maximum Number Of Revolving Tools	HD1
Main Spindle Speed Range	SP1 & SP2
Spindle Motor Power	SP1
Rivolving Tool Motor	2.2kw 20Nm 4.0kw 25Nm(OP.)
Machine Height	2,050mm
Sliding Headstock Type	A20
Bar Work	BNC42
Turning Machine	BNA42CY
High Precision Turning Machines	BNA42SY
Multi Station Machining Cell	MC20 III
Maximum Machining Diameter Of Bar Work Sp1	51mm Dia.
Maximum Machining Diameter Of Bar Work Sp2	51mm Dia.
Type Of Turret Hd1	12St.Turret
Type Of Turret Hd2	12St.Turret
Slide Stroke Hd1	80(±40) mm
Slide Stroke Hd2	175mm
Slide Stroke Sp2	155mm
Slide Stroke Sp2z3 Axis	450mm
Maximum Number Of Revolving Tools Hd1	12
Maximum Number Of Revolving Tools Hd2	12
Main Spindle Speed Range Sp1 Sp2	5,000min-1
Spindle Motor Sp1	15/11kW
Spindle Motor Sp2	7.5/5.5kW
Inquiries	Feel free to get in touch with us by phone or online if you have any questions or need advice about any of our products or services.

Specifications sourced from cmj.citizen.co.jp — verified 2026-03-28

Strengths & Limitations

Strengths

Twin 12-station turrets with 24 total live tool positions at 6,000 RPM provide maximum tooling density for the most complex parts in the 51 mm class
3-tool simultaneous cutting capability through independent upper turret, lower turret, and sub-spindle axis groups can reduce cycle times by 40-60% on complex parts
51 mm bar capacity on both spindles eliminates sub-spindle diameter restrictions, enabling full-diameter backworking on every part
Optional 4.0 kW (25 Nm) rotary tool upgrade delivers serious milling capability approaching dedicated milling spindles for demanding cross-milling applications
Dedicated X3/Z3 axis group for the sub-spindle provides true independence from the turret axes, enabling sophisticated multi-path machining sequences
Y-axis travel of 80 mm on the upper turret handles complex off-center features including flats, keyways, and hexagonal profiles

Limitations

8,000 kg weight and 2,725 x 2,159 mm footprint require substantial floor space and foundation work, limiting placement flexibility
44 kVA power consumption is significant, adding to operating costs compared to single-turret alternatives
$320,000+ new price point approaches full multi-tasking machines like the Mazak Quick Turn 250MSY, making the investment decision complex
3-tool simultaneous programming is highly complex, requiring experienced multi-path programmers and sophisticated collision simulation software
90 mm maximum machining length is relatively short for a machine of this capability level, limiting it to compact parts only

Best For

Medical implant manufacturers producing the most complex components requiring maximum tooling density and minimum cycle time from 51 mm bar stock Aerospace fitting and connector production where 3-tool simultaneous cutting on 24 live tool positions eliminates all secondary operations High-volume automotive component production where cycle time savings of 10-30 seconds per part through simultaneous cutting justify the machine premium Shops running complex parts with balanced front-and-back workload that can fully exploit twin-turret simultaneous machining capability Contract manufacturers producing premium parts where the BNE's capability level eliminates post-machining operations and part handling Production environments where 51 mm bar capacity on both spindles is essential for full-diameter backworking without compromise

Frequently Asked Questions

01 What does a new Citizen Miyano BNE-51MSY cost?

New BNE-51MSY machines typically range from $320,000 to $450,000 depending on tooling, the optional 4.0 kW rotary tool upgrade, high-pressure coolant, bar feeder, and automation. The twin 12+12 turret configuration with independent X3/Z3 axes commands the highest price in the 51 mm Miyano lineup. Used BNE-51MSY machines from 2015-2021 sell for $150,000-$280,000.

02 How does 3-tool simultaneous cutting work on the BNE-51MSY?

The upper turret (HD1) machines on the main spindle, the lower turret (HD2) machines on the sub-spindle, and the sub-spindle's independent X3/Z3 axes enable a third operation to run simultaneously. The control manages three independent tool paths with collision detection and synchronization points. This requires careful process planning to identify which operations can safely overlap.

03 How does the BNE-51MSY compare to the BNJ-51SY?

The BNE has twin 12+12 turrets (24 positions) versus the BNJ's 12+8 (20 positions), 2.2 kW live tool motors on both turrets versus 0.75 kW on the BNJ's lower turret, and a dedicated X3/Z3 axis group for the sub-spindle. The BNE also accepts 51 mm bar on both spindles versus 42 mm on the BNJ's sub-spindle. The BNE is the more capable machine at a $70,000-$90,000 premium.

04 Is the 4.0 kW rotary tool upgrade worth the cost?

The upgrade from 2.2 kW (20 Nm) to 4.0 kW (25 Nm) is worth it if your parts include deep cross-holes, large-diameter tapping, or milled pockets in harder materials. The additional torque enables larger end mills and higher material removal rates. For parts limited to small cross-holes and tapping, the standard 2.2 kW is adequate.

05 What control system does the BNE-51MSY use?

The BNE-51MSY runs on a Mitsubishi CNC with multi-path processing for independent turret and sub-spindle control. The control handles 3-tool simultaneous machining synchronization, collision detection, and superimposition sequences. Shops familiar with Fanuc may need to adapt to the Mitsubishi interface, though the programming concepts are similar.

06 Why is the maximum machining length only 90 mm?

The 90 mm machining length reflects the compact turret arrangement and the machine's optimization for short, complex parts. The twin 12-station turrets and independent sub-spindle axis group occupy the space that would allow longer machining length. For longer parts, the single-turret BND-51SY offers 320 mm machining length but without the twin-turret simultaneous machining capability.