Citizen Miyano BNA-42SY
Key Specifications
X Travel
Max Spindle
Spindle Power
max bar capacity sp1
max bar capacity sp2
max machining length
Overview
The Citizen Miyano BNA-42SY is a dual-spindle, single-turret fixed-headstock CNC lathe with Y-axis capability, designed for complete mill-turn machining of bar stock up to 42 mm diameter. The SY designation signals sub-spindle plus Y-axis, giving the machine off-center milling and drilling capability alongside precision turning in a compact production footprint.
The main spindle (SP1) delivers 11/7.5 kW (15/10 hp) from 60 to 6,000 RPM, while the sub-spindle (SP2) reaches 5,000 RPM with 5.5/3.7 kW (7.5/5 hp). The sub-spindle accepts bar up to 34 mm diameter and travels independently on the B-axis (Z2) with 360 mm of stroke for part pickup and backworking. The 12-station turret accepts live tools at all positions, running at 5,000 RPM with 2.8/1.0 kW of rotary tool power.
Y-axis travel of 70 mm (+/-35 mm) enables off-center drilling, milling, and tapping for producing flats, keyways, hexagonal profiles, and eccentric features. Axis travels measure 140 mm on X, 285 mm on Z1, and 360 mm on Z2. Rapid traverse rates of 20 m/min on X, Z, and Z2, and 12 m/min on Y keep non-cutting time tight. Superimposition control enables simultaneous front-and-back machining with the single turret.
Maximum machining length is 100 mm per chucking. At 3,880 kg with a floor space of 2,350 x 1,433 mm and rated power consumption of 26 kVA, the BNA-42SY delivers full dual-spindle Y-axis capability in a footprint that fits comfortably in most production cells.
The BNA-42SY is the workhorse of the Miyano BNA-42 lineup for shops running small precision parts with moderate milling requirements. Medical components, automotive fittings, hydraulic connectors, and electronic housings that need complete machining from bar stock with off-center features are the core application base. The 12 all-live turret stations and Y-axis superimposition provide strong cycle time performance against twin-turret machines at a lower acquisition cost.
Full Specifications
| Parameter | Value |
|---|---|
| Max Bar Capacity Sp1 | 42 mm (1.65 in) |
| Max Bar Capacity Sp2 | 34 mm (1.34 in) |
| Max Machining Length | 100mm |
| Main Spindle Speed | 60 - 6,000 RPM |
| Main Spindle Power | 11/7.5 kW (15/10 hp) |
| Sub Spindle Speed | 50 - 5,000 RPM |
| Sub Spindle Power | 5.5/3.7 kW (7.5/5 hp) |
| Turret Stations | 12 |
| Live Tool Stations | 12 |
| Live Tool Speed | 5,000 RPM |
| Live Tool Power | 2.8/1.0 kW |
| X-Axis Travel | 140 mm (5.51 in) |
| Travel Z1 | 285 mm (11.22 in) |
| Travel Z2 | 360 mm (14.17 in) |
| Y Axis Travel | 70 mm (+/-35 mm) |
| Rapid Traverse Xz | 20 m/min (787 ipm) |
| Rapid Traverse Y | 12 m/min (472 ipm) |
| Machine Weight | 3,880kg |
| Floor Space | 2,350 x 1,433 mm |
| Machine Height | 1,745 mm |
| Power Consumption | 26 kVA |
| CNC Control | Mitsubishi CNC |
| Item | BNA-42SY |
| Standard Machining Diameter | SP1 |
| Sp2 | 5.5/3.7kW（15min/cont.） |
| Turret Slide Travel Distance | X axis |
| Z Axis | 20m/min |
| Y Axis | 12m/min |
| Number Of Spindles | 2 |
| Max Spindle Speed | SP1 |
| Collet Chuck Size | SP1 |
| Number Of Tool Posts | 1 |
| Type Of Tool Post | 12 ST. |
| 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 |
| Rapid Feed Rate | X axis |
| B Axis | 20m/min |
| Spindle Motor Power | SP1 |
| Rotary Tools Motor | 2.8/1.0kW |
| Rated Power Consumption | 26kVA |
| Required Floor Surface Area | W2,350 × 1,433mm |
| Sliding Headstock Type | A20 |
| Bar Work | BNC42 |
| Turning Machine | BNA42CY |
| High Precision Turning Machines | BNA42SY |
| Multi Station Machining Cell | MC20 III |
| Standard Machining Diameter Sp1 | 42mm Dia. |
| Standard Machining Diameter Sp2 | 34mm Dia. |
| Turret Slide Travel Distance X Axis | 140mm |
| Turret Slide Travel Distance Z Axis | 285mm |
| Turret Slide Travel Distance Y Axis | 70（±35）mm |
| Spindle Speed Sp1 | 60 - 6,000min-1 |
| Spindle Speed Sp2 | 50 - 5,000min-1 |
| Collet Chuck Size Sp1 | 5" |
| Collet Chuck Size Sp2 | 4" |
| Rapid Feed Rate X Axis | 20m/min |
| Rapid Feed Rate Z Axis | 20m/min |
| Rapid Feed Rate Y Axis | 12m/min |
| Rapid Feed Rate B Axis | 20m/min |
| Spindle Motor Sp1 | 11/7.5/5.5kW（15%/15min/cont.） |
| Spindle Motor Sp2 | 5.5/3.7kW（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
- 12-station turret with all positions accepting live tools at 5,000 RPM provides maximum tooling density without sacrificing turning positions to static-only stations
- Y-axis travel of 70 mm enables off-center milling, drilling, and tapping for complex features like flats, keyways, and hexagonal profiles on bar stock
- Superimposition control overlaps front and back operations on the single turret, reducing cycle times by 15-30% on parts with significant backworking requirements
- 11/7.5 kW main spindle provides substantially more power than the base BNA-42S for aggressive roughing across the full 42 mm bar capacity range
- Compact 2,350 x 1,433 mm footprint delivers full dual-spindle Y-axis capability without the floor space demands of twin-turret machines
- Dual-spindle architecture eliminates second-operation handling, producing complete parts from bar stock in a single unattended cycle
Limitations
- Sub-spindle bar capacity limited to 34 mm versus 42 mm on the main spindle, restricting backworking on larger-diameter parts without the optional upgrade
- 100 mm maximum machining length is relatively short, limiting the machine to compact parts and ruling out longer shaft-type components
- Single turret shared between two spindles means backworking tool selection is limited compared to twin-turret BNJ and DHY variants
- 5,000 RPM live tool speed is competitive but below the 6,000 RPM available on the MSY and newer-generation Miyano platforms
Best For
Frequently Asked Questions
01
New BNA-42SY machines typically range from $150,000 to $220,000 depending on tooling configuration, high-pressure coolant, parts catcher, and bar feeder. Used machines from 2014-2020 sell for $60,000-$130,000 depending on hours, spindle condition, and included tooling.
02
The MSY has enhanced milling capability with 6,000 RPM live tools versus the SY's 5,000 RPM, an 8-station turret with half-indexing for 16 effective positions, and independent X2 axis on the sub-spindle. The SY has a 12-station turret with all-live capability. Choose the SY for maximum tool count; choose the MSY for more aggressive milling operations.
03
The standard sub-spindle accepts up to 34 mm diameter. An optional 42 mm sub-spindle configuration is available for shops that need full-diameter backworking. Check with your Citizen distributor for the specific sub-spindle upgrade availability.
04
The BNA-42SY runs on a Mitsubishi CNC control with superimposition capability, C-axis interpolation, rigid tapping, and Y-axis milling interpolation. Programming is consistent across the Miyano BNA platform.
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