Citizen Miyano BNA-42CY
Key Specifications
Max Spindle
Spindle Power
max machining diameter
max machining length
main spindle speed
main spindle power
Overview
Fixed-headstock CNC lathe for 42mm chucker work with C-axis and Y-axis milling in single-spindle configuration.
Spindle: 60-6,000 RPM, 11/7.5/5.5 kW. 12-station turret, all 12 live at up to 5,000 RPM (2.8/1.0 kW). Y-axis: 70mm (+/-35mm). Rapid: 20 m/min X/Z, 12 m/min Y. Max machining length 200mm. 3,220 kg, 2,260x1,433mm, 16 kVA.
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 | 11/7.5/5.5 kW (15/10/7.5 hp) |
| Number Of Spindles | 1 |
| Turret Stations | 12 |
| Live Tool Stations | 12 |
| Live Tool Speed | 50 - 5,000 RPM |
| Live Tool Power | 2.8/1.0 kW |
| Y Axis Travel | 70 mm (+/-35 mm) |
| Rapid Traverse Xz | 20 m/min |
| Rapid Traverse Y | 12 m/min |
| Chuck Options | S20, DIN173E, B&S #22, JPN34; 5/6 in power chuck |
| Floor Space | 2,260 x 1,433 mm |
| Machine Height | 1,745 mm |
| Machine Weight | 3,220kg |
| 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 |
| 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
Frequently Asked Questions
01
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
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
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
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
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
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.
