Citizen Miyano BNA-42DHY
Key Specifications
Rapid Traverse
max bar capacity sp1
max bar capacity sp2
max machining length
main spindle speed
main spindle power
Overview
The Citizen Miyano BNA-42DHY is a dual-spindle, dual-turret fixed-headstock CNC turning center that maximizes simultaneous machining capability within the compact 42 mm bar capacity BNA platform. The DHY designation — Dual turret, H-axis (second turret axis), Y-axis — signals a machine designed for minimum cycle times through truly independent multi-tool cutting.
The main spindle (SP1) runs from 60 to 6,000 RPM with 7.5/5.5 kW (10/7.5 hp) of power, while the sub-spindle (SP2) reaches 5,000 RPM with 5.5/3.7 kW (7.5/5 hp). The dual-turret configuration comprises an 8-station upper turret (HD1) serving the main spindle with live tools running at 5,000 RPM via a 2.8/1.0 kW motor, and a 6-station lower turret (HD2) serving the sub-spindle. Both turrets index in 0.2 seconds per station, keeping non-cutting time minimal.
The Y-axis provides 70 mm (+/-35 mm) of travel for off-center machining on the upper turret. Axis travels measure 140 mm on X1, 235 mm on Z1, 140 mm on X2, and 360 mm on Z2. Maximum machining length is 100 mm with bar capacity of 42 mm on the main spindle and 34 mm on the sub-spindle. Rapids reach 20 m/min on the main axes.
The critical advantage of the DHY over single-turret BNA variants is true simultaneous independent machining. While the upper turret machines on the main spindle, the lower turret can independently machine on the sub-spindle with no interference or time-sharing. This capability can reduce cycle times by 30-50% on parts with substantial backworking requirements compared to single-turret superimposition approaches.
At 3,100 kg with a footprint of 2,350 x 1,450 mm, the BNA-42DHY maintains the compact envelope that makes the BNA-42 platform popular in space-constrained shops. The machine uses 5-inch/4-inch power chucks with stationary collet options. Power consumption is moderate for a dual-turret machine.
The BNA-42DHY competes directly with twin-turret turning centers from Nakamura-Tome, Star, and Tsugami in the 42 mm class. Its strength is the combination of Miyano's proven rigidity and precision with true dual-turret independence in one of the smallest footprints available. Typical applications include medical components, automotive fittings, and electronic housings where cycle time reduction through simultaneous machining directly impacts part 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 | 100 mm (3.94 in) |
| Main Spindle Speed | 60 - 6,000 RPM |
| Main Spindle Power | 7.5/5.5 kW (10/7.5 hp) |
| Sub Spindle Speed | 50 - 5,000 RPM |
| Sub Spindle Power | 5.5/3.7 kW (7.5/5 hp) |
| Upper Turret Stations | 8 |
| Lower Turret Stations | 6 |
| Live Tool Speed | 5,000 RPM |
| Live Tool Power | 2.8/1.0 kW |
| Turret Index Time | 0.2 sec/station |
| Travel X1 | 140 mm (5.51 in) |
| Travel Z1 | 235 mm (9.25 in) |
| Travel X2 | 140 mm (5.51 in) |
| Travel Z2 | 360 mm (14.17 in) |
| Y Axis Travel | 70 mm (+/-35 mm) |
| Rapid Traverse Rate | 20 m/min (787 ipm) |
| Machine Weight | 3,100kg |
| Floor Space | 2,350×1,450mm |
| CNC Control | Mitsubishi CNC |
| Items | BNA-42DHY3 |
| Machining Capacity And Chuck System | Maximum Machining Diameter of Bar Work |
| Maximum Machining Length | 100mm |
| Power Chuck | SP1/SP2 |
| Collet Chuck Type | SP1/SP2 |
| Spindle | Spindle Nose |
| Spindle Motor | SP1 |
| Sp2 | 6St.Turret |
| Spindle Speed Range | SP1 |
| Turret | Type of Turret |
| Shank Height Of Square Turning Tool | 20mm Sq. |
| Diameter Of Drill Shank | 25mm Dia. |
| Turret Indexing Clamp Method | AC Servo motor & curvic coupling |
| Slide Stroke | X1 axis |
| Z1 Axis | 235mm |
| Y Axis | 70mm(±35) |
| X2 Axis | 140mm |
| Z2 Axis | 360mm |
| Indexing Time | 0.2Sec./1St. |
| Revolving Tools | Maximum Number of Revolving Tools |
| Tool Spindle Speed Range | 50 - 5,000min-1 |
| Revolving Tool Motor | 2.8/1.0kW |
| Machine Dimensions | Machine Height |
| Sliding Headstock Type | A20 |
| Bar Work | BNC42 |
| Turning Machine | BNA42CY |
| High Precision Turning Machines | BNA42SY |
| Multi Station Machining Cell | MC20 III |
| Maximum Machining Diameter Of Bar Work Sp1 Sp2 | 42mm Dia./34mm Dia. |
| Power Chuck Sp1 Sp2 | 5"/4" |
| Collet Chuck Type Sp1 Sp2 | Stationary |
| Spindle Nose Sp1 Sp2 | Special Flat Type |
| Spindle Motor Sp1 | 7.5/5.5kW |
| Spindle Motor Sp2 | 5.5/3.7kW |
| Spindle Speed Range Sp1 | 60 - 6,000min-1 |
| Spindle Speed Range Sp2 | 50 - 5,000min-1 |
| Type Of Turret Sp1 | 8St.Turret |
| Type Of Turret Sp2 | 6St.Turret |
| Slide Stroke X1 Axis | 140mm |
| Slide Stroke Z1 Axis | 235mm |
| Slide Stroke Y Axis | 70mm(±35) |
| Slide Stroke X2 Axis | 140mm |
| Slide Stroke Z2 Axis | 360mm |
| Maximum Number Of Revolving Tools Sp1 Sp2 | 8/--- |
| Machine Height | 1,700mm |
| 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
- True dual-turret independence enables simultaneous machining on both spindles with no time-sharing, reducing cycle times 30-50% versus single-turret superimposition on complex parts
- 0.2-second turret indexing on both turrets keeps non-cutting time minimal, critical for high-volume production where every second impacts unit cost
- Compact 2,350 x 1,450 mm footprint delivers full dual-turret capability in a footprint comparable to single-turret machines, fitting into tight shop layouts
- 6,000 RPM main spindle with Y-axis provides strong mill-turn capability for complex front-end features requiring off-center machining
- Independent X2 and Z2 axes on the sub-spindle turret enable backworking operations to run completely in parallel with front-end machining
- 3,100 kg weight is remarkably light for a dual-turret machine, reducing foundation requirements compared to larger twin-turret competitors
Limitations
- 8+6 station turret configuration (14 total) provides fewer tool positions than some twin-turret competitors offering 12+12 (24 total) stations
- 7.5/5.5 kW main spindle power is lower than the BND and BNX platforms, limiting aggressive roughing on harder materials at full diameter
- 34 mm sub-spindle capacity is smaller than the 42 mm main spindle, restricting full-diameter backworking on the largest parts
- Dual-turret programming is significantly more complex than single-turret machines, requiring experienced programmers to optimize simultaneous machining sequences
- 100 mm maximum machining length limits the machine to short, compact parts only
Best For
Frequently Asked Questions
01
New BNA-42DHY machines typically range from $200,000 to $300,000 depending on tooling configuration, high-pressure coolant, bar feeder, and parts catcher. The dual-turret design commands a $50,000-$80,000 premium over the single-turret BNA-42SY. Used BNA-42DHY machines from 2013-2020 sell for $80,000-$180,000.
02
The MSY uses a single turret with superimposition control — the sub-spindle moves in sync with the turret to share tool access between spindles. The DHY has two physically separate turrets that operate completely independently. The DHY can run two entirely different cutting operations simultaneously with no compromise. The MSY is simpler and cheaper but can only approximate simultaneous machining.
03
Yes. Dual-turret programming requires careful synchronization of two independent tool paths, collision avoidance between turrets, and optimization of which operations run simultaneously versus sequentially. Expect a 2-4 week learning curve for programmers experienced with single-turret machines. CAM software with dual-turret simulation is strongly recommended.
04
Parts with balanced complexity on both ends benefit most. If a part has extensive front-end features (turning, cross-drilling, milling) AND substantial backworking (threading, boring, facing), the dual-turret DHY can machine both ends simultaneously. Parts with minimal backworking see less benefit since the lower turret sits idle during most of the cycle.
05
Absolutely. The dual turrets can operate sequentially just like a single-turret machine. This gives you the flexibility to run simpler parts without complexity while having dual-turret capability available for high-volume parts where cycle time reduction matters. Many shops justify the DHY by reserving it for their highest-volume parts.
06
The BNA-42DHY runs on a Mitsubishi CNC control with dual-path processing for independent turret control. The control handles collision detection between turrets, synchronization points, and timing optimization. The dual-path architecture is essential for managing truly simultaneous operations without interference.
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