Citizen Miyano BNA-42DHY

$200,000 - $300,000 Updated 2026-03-19

Key Specifications

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

Overview

The Citizen Miyano BNA-42DHY is a dual-spindle, dual-turret fixed-headstock CNC lathe with Y-axis that maximizes simultaneous machining capability within the compact BNA-42 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 on both spindles.

The main spindle (SP1) runs from 60 to 6,000 RPM with 7.5/5.5 kW (10/7.5 hp), while the sub-spindle (SP2) reaches 5,000 RPM with 5.5/3.7 kW (7.5/5 hp). Bar capacity is 42 mm on the main spindle and 34 mm on the sub-spindle, with 5-inch and 4-inch power chucks respectively. The dual-turret configuration places an 8-station upper turret (HD1) serving the main spindle and a 6-station lower turret (HD2) serving the sub-spindle.

The upper turret accepts up to 8 live tools running at 5,000 RPM with 2.8/1.0 kW of rotary tool power. Both turrets index in 0.2 seconds per station. Y-axis travel of 70 mm (+/-35 mm) enables 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. Rapid traverse rates of 20 m/min on X1, Z1, and Z2, with 12 m/min on Y and X2.

Maximum machining length is 100 mm per chucking. At 3,100 kg with a floor space of 2,350 x 1,450 mm and machine height of 1,700 mm, the BNA-42DHY maintains the compact envelope of the BNA-42 platform while delivering full dual-turret independence.

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 can reduce cycle times by 30-50% on parts with substantial backworking compared to single-turret superimposition approaches.

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 Stations	8 (upper turret)
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 X1 Z1 Z2	20 m/min (787 ipm)
Rapid Traverse Y X2	12 m/min (472 ipm)
Power Chuck Sp1	5 inch
Power Chuck Sp2	4 inch
Machine Weight	3,100kg
Floor Space	2,350×1,450mm
Machine Height	1,700 mm
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/---
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
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
Y-axis travel of 70 mm on the upper turret provides off-center milling capability for complex front-end features
Independent X2 and Z2 axes on the lower 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

Limitations

8+6 station turret configuration provides fewer total tool positions than the BNJ series with 12+12 stations
7.5/5.5 kW main spindle power is lower than the MSY and GTY platforms, limiting aggressive roughing at full bar diameter
34 mm sub-spindle capacity restricts full-diameter backworking on the largest parts in the 42 mm range
Dual-turret programming is significantly more complex than single-turret machines, requiring experienced multi-path programmers

Best For

High-volume medical device production where simultaneous machining directly reduces per-part cost on implants and surgical instruments Automotive precision fitting manufacturers running large quantities where 5-10 seconds of cycle time savings per part adds up to significant annual savings Electronic connector housing production where front and back features can be machined simultaneously to halve cycle time Shops currently running single-turret BNA-42SY or MSY machines that need further cycle time reduction without stepping up to a larger platform Contract manufacturers with high-volume parts where dual-turret independence provides the fastest possible cycle times

Frequently Asked Questions

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

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 single-turret BNA-42SY variants.

02 How does the DHY differ from the MSY for simultaneous machining?

The MSY uses a single turret with superimposition control where the sub-spindle moves in sync with the turret. The DHY has two physically separate turrets that operate completely independently. The DHY runs two entirely different cutting operations simultaneously with no compromise. The MSY is simpler and cheaper but can only approximate simultaneous machining.

03 Is the BNA-42DHY harder to program than single-turret machines?

Yes. Dual-turret programming requires careful synchronization of two independent tool paths, collision avoidance between turrets, and optimization of simultaneous versus sequential operations. Expect a 2-4 week learning curve for experienced programmers. CAM software with dual-turret simulation is strongly recommended.

04 What types of parts benefit most from dual-turret machining?

Parts with balanced complexity on both ends benefit most. If a part has extensive front-end features AND substantial backworking, the DHY can machine both ends simultaneously. Parts with minimal backworking see less benefit since the lower turret sits idle during most of the cycle.