Citizen Miyano BNE-51MYY

$380,000 - $520,000 Updated 2025-03-15

Key Specifications

Max Spindle

5,000min-1

Spindle Power

SP1

max bar capacity sp1

51 mm (2.0 in)

max bar capacity sp2

51 mm (2.0 in)

max machining length

195mm

main spindle speed

5,000 RPM

Overview

The Citizen Miyano BNE-51MYY is the flagship of the Miyano 51 mm platform — a dual-spindle, twin-turret machine with dual Y-axes, 9 independent cutting axes, and 4 simultaneous cutting axes for the most demanding mill-turn applications in the fixed-headstock class. The MYY designation — Milling, dual Y-axis — signals maximum milling versatility with Y-axis capability on both upper and lower turrets.

The main spindle (SP1) reaches 5,000 RPM with 18.5/15 kW (25/20 hp) — the most powerful spindle in the 51 mm Miyano lineup. The sub-spindle (SP2) runs to 5,000 RPM with 11/7.5 kW (15/10 hp). Both spindles accept 51 mm bar stock. The higher spindle power on both ends reflects the machine's design intent: aggressive material removal with simultaneous multi-tool cutting.

The twin 12-station turrets each accept live tools running at 6,000 RPM with 4.0 kW rotary tool motors. The dual Y-axis configuration — one per turret — provides 80 mm of off-center travel on both upper and lower turrets, enabling complex milled features on both front and back of the part simultaneously. With 24 total live tool positions across both turrets, the BNE-51MYY handles parts needing extensive tooling without compromise.

Nine independent cutting axes and 4 simultaneous cutting axes provide the motion freedom for sophisticated multi-path machining. Axis travels on HD1 measure 205 mm on X1, 280 mm on Z1, and 100 mm (+60/-40 mm) on Y1. HD2 provides 205 mm on X2 and 175 mm on Z2 with its own Y-axis. The sub-spindle X3 axis adds 155 mm of travel. Rapids hit 20 m/min on main axes and 12 m/min on Y-axes. Maximum machining length is 195 mm.

At 8,080 kg with a footprint of 2,860 x 2,190 mm, the BNE-51MYY requires substantial floor space. The Mitsubishi M830W control with 15-inch touch panel HMI manages the 9-axis multi-path programming with superimposed machining and 3-tool simultaneous cutting. Power consumption of 47 kVA reflects the twin high-power spindles and dual rotary tool motors.

The BNE-51MYY is Citizen's answer for shops that need the absolute maximum mill-turn capability from a 51 mm fixed-headstock platform without stepping up to a full multi-tasking machine like the Mazak Integrex or DMG Mori NLX series. It competes at the top of the fixed-headstock turning center market alongside machines from Nakamura-Tome, Index, and Tornos.

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	195mm
Main Spindle Speed	5,000 RPM
Main Spindle Power	18.5/15 kW (25/20 hp)
Sub Spindle Speed	5,000 RPM
Sub Spindle Power	11/7.5 kW (15/10 hp)
Upper Turret Stations	12
Lower Turret Stations	12
Total Live Tool Positions	24
Live Tool Speed	6,000 RPM
Live Tool Power	4.0 kW per turret
Number Of Axes	9 independent cutting axes
Simultaneous Cutting Axes	4
Travel X1	205 mm (8.07 in)
Travel Z1	280 mm (11.02 in)
Travel Y1	100 mm (+60/-40 mm)
Travel X2	205 mm (8.07 in)
Travel Z2	175 mm (6.89 in)
Travel X3	155 mm (6.10 in)
Travel Z3	450 mm (17.72 in)
Y Axes	Dual (upper and lower turret)
Rapid Traverse Xz	20 m/min (787 ipm)
Rapid Traverse Y	12 m/min (472 ipm)
Machine Weight	8,130kg
Floor Space	2,860 x 2,190 mm
Power Consumption	47 kVA
CNC Control	Mitsubishi M830W
Model	BNE-51MYY
Standard Machining Diameter	65mm Dia.
Number Of Spindles	2
Max Spindle Speed	5,000min-1
Collet Chuck Type	Hardinge S22, DIN177E, HAINBUSH 51
Power Chuck Type	6" 3-claw chuck, 6" 2-claw chuck
Number Of Tool Posts	2
Type Of Tool Post	12st.Turret
Dimensions Of Tools Used	20mm Sq.
Dimensions Of Tool Post Holes	25mm Dia.
Number Of Installed Rotary Tools	Max.24
Rotating Speed Of Rotary Tools	6,000min-1
Feed Rate	X1,Z1,X3,Z3 axis
X2z2 Axis	18m/min
Y1y2 Axis	12m/min
Spindle Motor Power	SP1
Sp2	11/7.5kW（15min/cont.）
Rotary Tools Motor	4.0kW
Rated Power Consumption	47kVA
Machine Height	2,070mm
Required Floor Surface Area	W2,860×D2,190mm
Sliding Headstock Type	A20
Bar Work	BNC42
Turning Machine	BNA42CY
High Precision Turning Machines	BNA42SY
Multi Station Machining Cell	MC20 III
Feed Rate X1 Z1 X3 Z3 Axis	20m/min
Feed Rate X2 Z2 Axis	18m/min
Feed Rate Y1 Y2 Axis	12m/min
Spindle Motor Sp1	18.5/15kW（30min/cont.）
Spindle Motor Sp2	11/7.5kW（15min/cont.）
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

Dual Y-axes on both upper and lower turrets enable complex off-center milling features on both front and back of the part simultaneously — a capability rare even among premium twin-turret machines
18.5/15 kW main spindle is the most powerful in the 51 mm Miyano lineup, delivering 25 hp for aggressive roughing alongside multi-tool cutting sequences
24 live tool positions across twin 12-station turrets with 4.0 kW rotary motors on both provide class-leading milling capability in the fixed-headstock segment
9 independent cutting axes with 4 simultaneous cutting axes deliver the motion freedom for the most complex multi-path machining sequences possible in a fixed-headstock turning center
195 mm maximum machining length is the longest in the BNE family, handling parts that the 90 mm BNE-51MSY cannot accommodate
51 mm bar capacity on both spindles ensures full-diameter backworking with no sub-spindle diameter restrictions

Limitations

8,080 kg weight and 2,860 x 2,190 mm footprint demand substantial floor space and foundation work, making it impractical for smaller shops
47 kVA power consumption is the highest in the Miyano lineup, adding significant operating cost compared to single-turret alternatives
$380,000+ new price puts it in direct competition with full multi-tasking machines that offer B-axis and larger work envelopes
9-axis programming with dual Y-axes and 4 simultaneous cutting axes requires the most experienced multi-path programmers available — a very scarce skill set
Mitsubishi M830W control is sophisticated but has a smaller third-party post processor ecosystem compared to Fanuc-controlled competitors

Best For

Medical implant manufacturers producing the most complex components requiring dual Y-axis capability for angular milling features on both ends of the part Aerospace fitting and connector production where 24 live tools with dual Y-axes eliminate every possible secondary operation Premium automotive component production where the dual Y-axis twin-turret delivers cycle times that justify the machine's premium over simpler platforms Shops producing parts that need Y-axis milling on the sub-spindle side — a capability that most twin-turret machines lack Contract manufacturers running the highest-value parts in their portfolio where the BNE-51MYY's 9-axis capability makes the difference between one setup and three Production environments that have maximized the capability of BNE-51MSY and BNJ-51SY machines and need the dual Y-axis for the next level of part complexity

Frequently Asked Questions

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

New BNE-51MYY machines typically range from $380,000 to $520,000 fully equipped with tooling, high-pressure coolant, bar feeder, and parts catcher. The dual Y-axis twin-turret configuration with 18.5 kW spindle and 4.0 kW rotary tool motors commands the highest price in the Miyano 51 mm lineup. Used machines are rare on the secondary market.

02 What does dual Y-axis add that single Y-axis doesn't?

Single Y-axis machines can only do off-center milling on the upper turret side. The dual Y-axis BNE-51MYY adds Y-axis capability to the lower turret as well, meaning both turrets can perform off-center drilling, milling, and tapping. This is critical for parts with milled features on both ends — flats, keyways, cross-holes at angles — that would otherwise require refixturing.

03 How does the BNE-51MYY compare to a full multi-tasking machine like the Mazak Integrex?

The Integrex offers a B-axis milling spindle with HSK taper for true 5-axis machining capability and a much larger work envelope. The BNE-51MYY uses turret-mounted live tools without a B-axis but delivers faster cycle times on small parts through twin-turret simultaneous cutting. For parts under 51 mm diameter where live tooling suffices, the BNE-51MYY is often faster. For parts needing B-axis angular machining or larger diameters, the Integrex wins.

04 What is the 15-inch touch panel HMI like?

The Mitsubishi M830W control features a 15-inch color touch panel that represents a major usability improvement over older Mitsubishi controls. It provides graphical programming assistance, 3D tool path simulation, and intuitive axis monitoring. The touch interface is responsive and makes navigating the 9-axis machine's complex programming environment significantly more efficient.

05 Can the BNE-51MYY run simpler parts economically?

Yes, but it's not cost-effective. Running simple parts on a $400,000+ machine wastes capability and ties up an expensive resource. Most shops reserve the BNE-51MYY for their highest-complexity, highest-value parts and run simpler work on BND or BNJ machines. The machine's strength is eliminating secondary operations on complex parts, not general-purpose turning.

06 What maintenance does the BNE-51MYY require?

Standard maintenance includes daily chip removal and coolant checks, weekly way lube and hydraulic system inspection, and annual spindle bearing and turret indexing verification. The dual turrets and Y-axes add maintenance points compared to simpler machines. Budget $8,000-$15,000 per year for consumables and periodic service on a machine running two shifts. The M830W control supports predictive maintenance monitoring.