Citizen Miyano BNA-42CY

$120,000 - $180,000 Updated 2025-03-15

Key Specifications

Max Spindle

60 - 6,000min-1

Spindle Power

11/7.5/5.5kW（15％/15min/cont.）

max machining diameter

42 mm (1.65 in)

max machining length

200mm

main spindle speed

60 - 6,000 RPM

main spindle power

11/7.5 kW (15/10 hp)

Overview

The Citizen Miyano BNA-42CY is a fixed-headstock CNC automatic lathe designed for chucker-style machining of castings, forgings, and pre-cut blanks up to 42 mm diameter. Unlike the sub-spindle-equipped SY and MSY variants in the BNA-42 family, the CY focuses on single-spindle precision with C-axis contouring and Y-axis milling capability, making it a strong fit for shops that need live tooling versatility without the complexity of a second spindle.

The main spindle runs from 60 to 6,000 RPM powered by an 11/7.5 kW (15 hp/10 hp) motor, delivering solid torque across a wide speed range for both steel and aluminum work. The 12-station turret accepts all 12 positions as live tool stations running up to 5,000 RPM with a 2.8/1.0 kW rotary tool motor, enabling cross-drilling, milling, tapping, and C-axis contouring without secondary operations. Y-axis travel of 70 mm (+/-35 mm) adds off-center machining capability for flats, keyways, and eccentric features.

Rapid traverse rates hit 20 m/min on X and Z axes with 12 m/min on Y, keeping non-cutting time low during tool changes and repositioning. The maximum machining length of 200 mm accommodates a broad range of chucker parts. Collet and 5-inch or 6-inch power chuck options provide flexibility for round bar, hex stock, and irregular blanks.

At 3,220 kg and a compact 2,260 x 1,433 mm footprint, the BNA-42CY fits comfortably into tight shop floor layouts. Rated power consumption of 16 kVA keeps operating costs manageable. The machine shares the BNA-42 platform's proven cast iron bed and high-rigidity turret construction that Miyano is known for in the Japanese precision turning market.

The CY configuration is purpose-built for second-operation work and chucker applications where raw castings or forgings need turning, drilling, and milling in a single setup. Medical device housings, automotive sensor bodies, hydraulic valve bodies, and pneumatic fittings are typical parts. Shops running these components on older chucker lathes without live tooling can consolidate two or three operations into one cycle on the BNA-42CY.

Competitors in this space include the Tsugami B0326-III for smaller work and the Nakamura-Tome SC-100 for similar chucker applications. The Miyano's 12-station all-live turret with Y-axis gives it a tooling density advantage over machines that split stations between static and live positions.

Full Specifications

Parameter	Value
Max Machining Diameter	42 mm (1.65 in)
Max Machining Length	200mm
Main Spindle Speed	60 - 6,000 RPM
Main Spindle Power	11/7.5 kW (15/10 hp)
Number Of Spindles	1
Turret Stations	12
Live Tool Stations	12
Live Tool Speed	5,000 RPM
Live Tool Power	2.8/1.0 kW
Y Axis Travel	70 mm (+/-35 mm)
Rapid Traverse Xz	20 m/min (787 ipm)
Rapid Traverse Y	12 m/min (472 ipm)
Chuck Options	Collet, 5 in or 6 in power chuck
Machine Weight	3,220kg
Floor Space	2,260 x 1,433 mm
Power Consumption	16 kVA
CNC Control	Mitsubishi CNC
Model	BNA-42CY
Standard Machining Diameter	42mm Dia.
Max Spindle Speed	60 - 6,000min-1
Collet Chuck Type	Hardinge S20、DIN173E、B&S#22、JPN34、HAINBUSH
Power Chuck Type	5" and 6" hollow chucks
Number Of Tool Posts	1
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.12
Rotating Speed Of Rotary Tools	50～5,000min-1
Feed Rate	X axis
Z Axis	20m/min
Y Axis	23m/min
Spindle Motor Power	11/7.5/5.5kW（15％/15min/cont.）
Rotary Tools Motor	2.8/1.0kW
Rated Power Consumption	16kVA
Machine Height	1,745mm
Required Floor Surface Area	W2,260×D1,433mm
Sliding Headstock Type	A20
Bar Work	BNC42
Turning Machine	BNA42CY
High Precision Turning Machines	BNA42SY
Multi Station Machining Cell	MC20 III
Feed Rate X Axis	20m/min
Feed Rate Z Axis	20m/min
Feed Rate Y Axis	12m/min
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

All 12 turret stations accept live tools running up to 5,000 RPM, providing maximum tooling flexibility for complex chucker parts without sacrificing turning positions
Y-axis travel of 70 mm enables off-center milling, drilling, and tapping for flats, keyways, and eccentric features that would otherwise require a second operation
Compact 2,260 x 1,433 mm footprint fits into tight shop layouts where floor space is at a premium, smaller than most competing mill-turn machines
11/7.5 kW main spindle delivers strong torque across the full 60-6,000 RPM range for both heavy roughing in steel and high-speed finishing in aluminum
Single-spindle chucker design simplifies programming and setup compared to dual-spindle machines, reducing the learning curve for operators transitioning from conventional lathes
Low 16 kVA power consumption keeps operating costs well below larger mill-turn platforms while still delivering full C-axis and Y-axis capability

Limitations

Single spindle only — no sub-spindle for backworking, so parts requiring machining on both ends still need a second operation or a different machine
5,000 RPM live tool speed is adequate for drilling and tapping but trails the 6,000+ RPM available on newer Miyano models for demanding milling applications
42 mm maximum bar capacity limits the machine to small-to-mid-size parts; shops running larger castings or forgings need to step up to a 51 mm or 65 mm platform
Maximum machining length of 200 mm restricts longer shaft-type work that would be common on larger chucker lathes
No LFV chip-breaking technology available on this model, which can be a limitation when machining gummy materials like 316 stainless or titanium unattended

Best For

Second-operation chucker work on castings and forgings requiring turning, drilling, and milling in a single setup Medical device manufacturers producing housings, valve bodies, and sensor components up to 42 mm diameter Automotive shops machining sensor bodies, solenoid housings, and small hydraulic components with cross-holes and flats Job shops consolidating two or three operations into one cycle to reduce handling time and improve tolerances Shops transitioning from older chucker lathes without live tooling that need C-axis and Y-axis capability without the complexity of a dual-spindle machine Pneumatic and hydraulic fitting manufacturers needing precise cross-drilling and milling on turned parts

Frequently Asked Questions

01 What does a new Citizen Miyano BNA-42CY cost?

New pricing for the BNA-42CY typically falls in the $120,000-$180,000 range depending on tooling package, high-pressure coolant options, and bar feeder integration. Used BNA-42CY machines from 2015-2020 trade between $50,000 and $100,000 depending on hours and condition. The single-spindle configuration makes it one of the more affordable entries in the Miyano lineup.

02 How does the BNA-42CY differ from the BNA-42SY?

The CY is a single-spindle chucker machine optimized for castings and forgings, while the SY adds a sub-spindle for complete front-and-back machining of bar stock. The CY has a longer maximum machining length of 200 mm versus 100 mm on the SY, making it better suited for longer chucker parts. Choose the CY when you don't need backworking and want a simpler, less expensive machine.

03 Can the BNA-42CY run bar stock with a bar feeder?

While the BNA-42CY is primarily designed as a chucker for pre-cut blanks, castings, and forgings, it can accept bar stock up to 42 mm diameter with a compatible bar feeder. However, without a sub-spindle for part pickup and backworking, you'll need a separate operation for any back-end features. The SY or MSY variants are better choices for bar-fed production.

04 What control system does the BNA-42CY use?

The BNA-42CY runs on a Mitsubishi CNC control with C-axis interpolation, rigid tapping, and milling interpolation capability. The control supports background editing and stores up to 320 meters of program data. Operators familiar with Fanuc controls will find the Mitsubishi interface similar enough to get productive quickly.

05 What types of parts are best suited for the BNA-42CY?

The BNA-42CY excels at chucker parts made from castings, forgings, and pre-cut blanks that need turning, cross-drilling, milling, and tapping in one setup. Typical parts include hydraulic valve bodies, medical device housings, automotive sensor bodies, pneumatic fittings, and small gear blanks. The 12-station all-live turret handles parts needing up to 12 different tools without compromise.

06 How does the BNA-42CY compare to a standard CNC lathe with live tooling?

The Miyano's advantage is its purpose-built mill-turn architecture with a rigid Y-axis and dedicated C-axis, rather than live tooling bolted onto a standard lathe turret as an afterthought. The all-12-live-station turret provides more milling positions than most standard lathes that split between static and driven stations. The trade-off is higher acquisition cost versus a basic live-tooling lathe.