Citizen Miyano BNA-42GTY

$250,000 - $380,000 Updated 2025-03-15

Key Specifications

Max Spindle

SP1

max bar capacity sp1

42 mm (1.65 in)

max bar capacity sp2

42 mm (1.65 in)

main spindle speed

6,000 RPM

main spindle power

11/7.5 kW (15/10 hp)

sub spindle speed

5,000 RPM

Overview

The Citizen Miyano BNA-42GTY is the most versatile machine in the BNA-42 family, combining a dual-spindle architecture with a turret, gang tool post, and dual Y-axes for up to 45 tool positions and 3-tool simultaneous cutting. The GTY designation — Gang Tool, Turret, Y-axis — signals a machine built for maximum tooling density and minimum cycle times on complex small parts from 42 mm bar stock.

The main spindle (SP1) reaches 6,000 RPM with 11/7.5 kW (15/10 hp), while the sub-spindle (SP2) runs to 5,000 RPM with 5.5/3.7 kW (7.5/5 hp). Both spindles accept 42 mm bar stock. The 8-station turret (with half-indexing for 16 effective positions) serves the main spindle, while a gang tool post mounted on the opposite side provides 3 front turning positions and 3 revolving tool positions. A separate back ID tool station holds 5 tools for sub-spindle internal machining.

The machine features 9 controlled axes: Z1, X1, Y1 on the turret; Z2, X2, Y2 on the sub-spindle; and Z3, X3 on a third axis group. Y1 travel of 260 mm and Y2 travel of 70 mm provide generous off-center machining range on both turret and sub-spindle sides. The turret gang revolving tools run at 1.0 kW and 1.5 kW respectively. LFV (Low Frequency Vibration) chip-breaking technology is available.

The 3-tool simultaneous cutting capability is the GTY's signature feature. The turret, gang tool post, and sub-spindle turret can all cut simultaneously, overlapping operations that would run sequentially on simpler machines. Combined with the 45-tool capacity, this enables some of the most complex parts in the 42 mm class to be completed in a single cycle with minimal idle time.

At 3,740 kg with a footprint suited for compact shop layouts, the BNA-42GTY delivers multi-tasking capability that approaches machines costing significantly more. The Mitsubishi control handles the multi-path synchronization with background editing and 320 m storage capacity. The C-axis, milling interpolation, and rigid tapping features are standard.

The BNA-42GTY is the right choice when maximum tooling density and minimum cycle time are the primary goals. It outpaces every other machine in the BNA-42 lineup for complex parts that need many different tools and multiple simultaneous operations. Medical implant components with 20+ features, aerospace connectors with cross-holes at multiple angles, and electronic housings with complex milled profiles are typical applications.

Full Specifications

Parameter	Value
Max Bar Capacity Sp1	42 mm (1.65 in)
Max Bar Capacity Sp2	42 mm (1.65 in)
Main Spindle Speed	6,000 RPM
Main Spindle Power	11/7.5 kW (15/10 hp)
Sub Spindle Speed	5,000 RPM
Sub Spindle Power	5.5/3.7 kW (7.5/5 hp)
Turret Stations	8 (half-indexing for 16 effective positions)
Gang Tool Positions	6 (3 turning + 3 revolving)
Back Id Tools	5
Total Tool Capacity	21 - 45
Number Of Axes	9
Travel Z1	110 mm (4.33 in)
Travel X1 Y1	95 mm / 260 mm
Travel Z2 X2 Y2	235 mm / 140 mm / 70 mm
Travel Z3 X3	360 mm / 190 mm
Rapid Traverse Z1	30 m/min
Rapid Traverse X1 Y1	24 m/min / 30 m/min
Lfv Chip Breaking	Available
Machine Weight	3,750kg
CNC Control	Mitsubishi CNC
Items	BNA-42GTY
Maximum Machining Diameter Of Bar Work	SP1
Sp2	5,000min-1
Maximum Machining Length	100mm
Spindle Motor	SP1
Max Spindle Speed	SP1
Type Of Turret	8St.Turret(half-indexing mechanism)
Shank Height Of Square Turning Tool	20mm Sq.
Diameter Of Drill Shank	25mm Dia.
Rapid Feed Rate	Z1 axis
X1 Axis	24m/min
Y1 Axis	30m/min
Z2 Axis	20m/min
X2 Axis	20m/min
Y2 Axis	12m/min
Z3 Axis	20m/min
X3 Axis	12m/min
Maximum Number Of Revolving Tools	8
Machine Height	1,680mm
Floor Space	2,350×1,475mm
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	42mm Dia.
Maximum Machining Diameter Of Bar Work Sp2	34mm Dia.
Spindle Motor Sp1	11/7.5kW
Spindle Motor Sp2	5.5/3.7kW
Spindle Speed Sp1	6,000min-1
Spindle Speed Sp2	5,000min-1
Rapid Feed Rate Z1 Axis	30m/min
Rapid Feed Rate X1 Axis	24m/min
Rapid Feed Rate Y1 Axis	30m/min
Rapid Feed Rate Z2 Axis	20m/min
Rapid Feed Rate X2 Axis	20m/min
Rapid Feed Rate Y2 Axis	12m/min
Rapid Feed Rate Z3 Axis	20m/min
Rapid Feed Rate X3 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

Up to 45 tool positions across turret, gang, and back ID stations provides class-leading tooling density for complex parts needing many different tools in a single cycle
3-tool simultaneous cutting capability overlaps turret, gang, and sub-spindle operations for cycle times that single-turret and even twin-turret machines cannot match
Dual Y-axes (260 mm on Y1, 70 mm on Y2) provide exceptional off-center machining range for complex milled features on both front and back of the part
42 mm bar capacity on both spindles ensures full-diameter backworking without the sub-spindle diameter limitation found on SY and MSY variants
LFV chip-breaking technology is available for reliable unattended production in stainless steel and titanium
9 controlled axes deliver multi-tasking capability approaching machines costing significantly more, all in a compact BNA-42 platform footprint

Limitations

Most expensive machine in the BNA-42 lineup at $250,000+, approaching the cost of 51 mm and 65 mm platforms that offer larger bar capacity
9-axis programming with 3-tool simultaneous cutting is complex and requires experienced multi-path programmers — a scarce skill set
Gang tool post revolving tool power of 1.0-1.5 kW is modest, limiting the aggressiveness of gang-side milling operations
Multiple tool stations and axes create more potential collision scenarios, requiring careful simulation before running new programs
3,740 kg weight and higher power requirements represent a step up from simpler BNA-42 variants

Best For

Medical implant manufacturers producing complex components with 20+ features requiring maximum tooling density and minimum cycle time Aerospace connector and fitting production where parts need multiple cross-holes, milled flats, and threaded features at different angles High-volume production shops where 3-tool simultaneous cutting reduces cycle time enough to justify the premium over simpler dual-spindle machines Electronic housing manufacturers producing parts with complex milled profiles, multiple drilled features, and tight-tolerance turned surfaces Shops that have exhausted the tooling capacity of standard 12-station turret machines and need 20+ tools per part without magazine changes Contract manufacturers running the most complex small parts in their portfolio where the GTY's capability eliminates secondary operations entirely

Frequently Asked Questions

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

New BNA-42GTY machines typically range from $250,000 to $380,000 fully equipped. The 9-axis, 45-tool, 3-tool simultaneous cutting capability commands a significant premium over simpler BNA-42 variants. Used GTY machines are relatively rare on the secondary market due to high demand and tend to hold value well.

02 How does 3-tool simultaneous cutting work?

The turret cuts on one spindle while the gang tool post cuts on the same or different spindle, and the sub-spindle tools work independently. All three groups operate simultaneously without interference. This requires careful process planning to identify which operations can overlap and which must run sequentially due to workpiece dynamics or spindle load considerations.

03 How does the GTY compare to the DHY?

The DHY has two separate turrets (8+6 stations) for dual-turret independence. The GTY has a turret plus gang tools plus back ID tools for up to 45 positions and 3-tool simultaneous cutting. The GTY offers more tools and more simultaneous cutting axes but requires more complex programming. Choose the DHY for simpler dual-turret work; choose the GTY when you need maximum tooling density and minimum cycle time.

04 What is the learning curve for the BNA-42GTY?

Expect 3-6 months for experienced CNC programmers to become proficient with the 9-axis, multi-path programming required for the GTY. The 3-tool simultaneous cutting sequences need careful optimization and collision simulation. CAM software with multi-channel simulation is essential. Shops new to multi-path programming should budget for Citizen training and consider starting with simpler jobs before attempting full simultaneous machining.

05 Can the BNA-42GTY run simpler parts that don't use all 45 tools?

Yes. The GTY runs simpler parts perfectly well, using only the turret and ignoring the gang tools and extra axes. Many shops run a mix of complex high-volume parts that exploit the full capability and simpler parts that use it as a standard dual-spindle turning center. The flexibility to scale complexity up or down is a key advantage.

06 What makes the GTY different from a Swiss-type machine?

The GTY is a fixed-headstock machine where the workpiece is stationary and the tools move to it. Swiss-type machines use a sliding headstock where the bar moves through a guide bushing. The GTY handles larger diameters (42 mm vs typical 20-32 mm Swiss) and shorter parts without the length-to-diameter ratio limitations of Swiss machines. For short, complex parts at 42 mm, the GTY is often the better choice.