Citizen Miyano BNX-65MSY

$260,000 - $370,000 Updated 2025-03-15

Key Specifications

max bar capacity

65 mm (2.56 in)

draw tube bore

66 mm

main spindle speed

5,000 RPM

main spindle power

18.5/15 kW (25/20 hp)

sub spindle speed

5,000 RPM

turret stations

Overview

The Citizen Miyano BNX-65MSY is the largest-capacity machine in the BNX platform, stepping up to 65 mm bar capacity for shops that need Miyano precision in a bigger envelope. The MSY designation delivers milling capability, sub-spindle, and Y-axis in a dual-spindle configuration with LFV chip-breaking technology, making it a serious contender for mid-size mill-turn production work.

The main spindle (SP1) reaches 5,000 RPM with 18.5/15 kW (25/20 hp) — the most powerful spindle motor in the BNX family, sized for aggressive roughing at the larger 65 mm bar diameter. The sub-spindle (SP2) also runs to 5,000 RPM with substantial power for backworking operations. The 66 mm draw tube through-hole accommodates 65 mm bar stock with proper clearance. Both spindles accept collet chucks (HS-26/DIN185E/Hainbuch 65) or power chucks.

The 12-station turret accepts live tools at all positions running to 6,000 RPM with 4.0 kW (25 Nm) rotary tool power. Y-axis travel is available for off-center machining. Axis travels measure 168 mm on X1, 349 mm on Z1, 88 mm on X2, and 650 mm on Z2, with rapids of 24 m/min on X1 and Z1. The independent X2 sub-spindle axis enables overlap machining for reduced cycle times.

At 5,500 kg with a footprint of 2,990 x 1,560 mm, the BNX-65MSY is only marginally larger than the 51 mm variant but delivers substantially more material removal capability. Power consumption of 39 kVA reflects the larger spindle motors. The Mitsubishi M830W control manages all axes including superimposition and LFV programming.

LFV chip-breaking technology is particularly valuable at the 65 mm bar size where chip volume during roughing operations is substantial. In stainless steel and titanium, the 65 mm bar diameter generates massive chips that can wrap around the workpiece and cause crashes during unattended operation. LFV eliminates this risk by oscillating the tool to produce short, manageable chip segments.

The BNX-65MSY fills a unique niche in the market — it's one of the few compact dual-spindle mill-turn machines with genuine 65 mm bar capacity, strong milling power, and LFV technology. Competitors in the 65 mm class tend to be larger, more expensive twin-turret machines or full multi-tasking centers. Typical applications include large hydraulic manifold components, oil and gas fittings, industrial valve bodies, and heavy automotive drivetrain parts.

Full Specifications

Parameter	Value
Max Bar Capacity	65 mm (2.56 in)
Draw Tube Bore	66 mm
Main Spindle Speed	5,000 RPM
Main Spindle Power	18.5/15 kW (25/20 hp)
Sub Spindle Speed	5,000 RPM
Turret Stations	12
Live Tool Stations	12
Live Tool Speed	6,000 RPM
Live Tool Power	4.0 kW (25 Nm)
Travel X1	168 mm (6.61 in)
Travel Z1	349 mm (13.74 in)
Travel X2	88 mm (3.46 in)
Travel Z2	650 mm (25.59 in)
Y Axis	Yes
Rapid Traverse Xz	24 m/min (945 ipm)
Rapid Traverse Y	10 m/min (394 ipm)
Lfv Chip Breaking	Available
Machine Weight	5,500
Floor Space	2,990 x 1,560 mm
Power Consumption	39 kVA
CNC Control	Mitsubishi M830W
Items	BNX-51MSY2
Standard Machining Diameter	SP1/SP2
Power Chuck Type	SP1/SP2
Distance Between Spindle End Faces	892 mm
Motor For Spindle	SP1 Cs
Sp2 Cs	1 / 7.5 kW (15 min / cont.)
Max Spindle Speed	SP1/SP2
Type Of Tool Slide	12st
Tool	□20 mm
Sleeve	φ25 mm
Slide Stroke	X1 axis
Z1 Axis	349 mm
Z2 Axis	650 mm
Y1 Axis	±40 mm
X2 Axis	88 mm
Revolving Tool Capacity	Max. 12
Machine Height	1,775mm
Sliding Headstock Type	A20
Bar Work	BNC42
Turning Machine	BNA42CY
High Precision Turning Machines	BNA42SY
Multi Station Machining Cell	MC20 III
Standard Machining Diametersp1 Sp2	ø65 mm/ø65 mm
Power Chuck Typesp1 Sp2	6” hollow chuck
Distance Between Spindle End Facessp1 Cs	18.5 / 15 kW (15 min / cont.)
Distance Between Spindle End Facessp2 Cs	1 / 7.5 kW (15 min / cont.)
Max Spindle Speedsp1 Sp2	5,000 min-1
Slide Strokex1 Axis	168 mm
Slide Strokez1 Axis	349 mm
Slide Strokez2 Axis	650 mm
Slide Strokey1 Axis	±40 mm
Slide Strokex2 Axis	88 mm
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

65 mm bar capacity with 18.5/15 kW spindle motor provides serious material removal capability that handles large-diameter steel and stainless components without compromise
4.0 kW (25 Nm) live tool motor at 6,000 RPM delivers genuine milling capability for deep cross-holes, flats, and complex milled features on large-diameter parts
LFV chip-breaking technology is critical at 65 mm bar size where massive chip volumes in stainless steel and titanium would otherwise prevent reliable unattended operation
Compact 2,990 x 1,560 mm footprint is remarkably small for a 65 mm bar capacity dual-spindle mill-turn machine, fitting into spaces where larger competitors cannot
650 mm Z2 sub-spindle travel provides ample clearance for part pickup and backworking operations on longer parts
Shared BNX platform with the 51 mm variant means operators and programmers can transition between machines with minimal retraining

Limitations

5,000 RPM maximum spindle speed limits high-speed turning on small-diameter features; shops doing extensive small-bore finishing may want higher RPM capability
Single turret shared between two spindles restricts simultaneous machining compared to the twin-turret BNE-65MYY platform
39 kVA power consumption and 5,500 kg weight represent significant facility requirements for a compact machine
Higher price point of $260,000+ puts it in range of some full multi-tasking machines that offer more capability
Sub-spindle capacity may be limited compared to the main spindle's full 65 mm, restricting backworking on the largest diameter parts

Best For

Oil and gas fitting manufacturers producing connectors and couplings from 65 mm bar stock with cross-holes and backworking requirements Heavy hydraulic manifold and valve body production requiring aggressive roughing at large diameters with live tooling for cross-features Industrial valve manufacturers needing complete front-and-back machining of valve bodies and stems from 65 mm bar Automotive drivetrain component production including larger shaft-type parts, hub blanks, and coupling bodies Shops running unattended production in stainless steel and titanium at 65 mm bar size where LFV chip-breaking is essential for reliability Contract manufacturers that need a compact 65 mm mill-turn platform without the floor space and cost of a full multi-tasking machine

Frequently Asked Questions

01 What does a new Citizen Miyano BNX-65MSY cost?

New BNX-65MSY machines range from approximately $260,000 to $370,000 depending on tooling, LFV option, high-pressure coolant, and bar feeder. The 65 mm capacity and larger spindle motors command a premium over the BNX-51MSY. Used machines are relatively scarce as the BNX-65 is a newer addition to the lineup.

02 How does the BNX-65MSY compare to the BNE-65MYY?

The BNE-65MYY is a twin-turret machine with dual 12-station turrets and dual Y-axes (9 axes total), offering true simultaneous machining on both spindles with dedicated tooling. The BNX-65MSY uses a single turret with superimposition control. The BNE is substantially more capable and expensive ($350,000-$500,000+). Choose the BNX for simpler parts and lower investment; choose the BNE when simultaneous multi-tool cutting justifies the premium.

03 Why is LFV especially important at 65 mm bar diameter?

At 65 mm diameter, the surface speed and chip cross-section during roughing are substantially larger than at 42 mm or 51 mm. This produces massive chip volumes — especially in stainless steel and titanium — that can wrap around the workpiece and tooling, causing crashes during unattended operation. LFV oscillates the cutting tool to break chips into short segments, making lights-out production reliable even in the most difficult materials.

04 What bar feeder works with the BNX-65MSY?

The 65 mm bar capacity requires a feeder rated for 2.5-inch or larger bar stock. Common pairings include the LNS Quick Load Servo 80, Edge FMB Turbo 5-65, and Iemca Master 80 or Boss 552. Hydrodynamic feeders are recommended for parts requiring tighter roundness tolerance on the fed bar.

05 Can the BNX-65MSY handle chucker work as well as bar stock?

Yes. With power chuck workholding, the BNX-65MSY handles castings, forgings, and pre-cut blanks for chucker-style machining. The 65 mm capacity through the spindle bore also enables bar feeding for production work. Most shops maintain both collet and chuck setups for maximum flexibility across different part families.

06 What is the maximum part length the BNX-65MSY can machine?

The machining length depends on the workholding configuration but the Z1 travel of 349 mm and generous Z2 travel of 650 mm accommodate a wide range of part lengths. For bar-fed work, the practical machining length is determined by the distance between spindles and the part's length-to-diameter ratio for stability.