Citizen Miyano BNA-42MSY2

$175,000 - $260,000 Updated 2026-03-19

Key Specifications

max bar capacity sp1

42 mm (1.65 in)

max bar capacity sp2

34 mm (1.34 in), 42 mm optional

max machining length

100 mm (3.94 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-42MSY2 is the second-generation version of the BNA-42MSY, a dual-spindle, single-turret fixed-headstock CNC lathe with enhanced milling and Y-axis capability for 42 mm bar stock. The MSY2 generation brings refined 2-tool simultaneous cutting through improved superimposition algorithms, delivering twin-turret-class cycle time performance from a single-turret mechanical configuration.

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). The sub-spindle accepts bar up to 34 mm diameter (42 mm optional). The 8-station turret with single-clutch live tools runs at 6,000 RPM with 1.0 kW (12 Nm) of rotary tool power. The turret serves both spindles through superimposition control.

Axis travels include 140 mm on X1, 235 mm on Z1, +/-35 mm on Y1, 129 mm on X2, and 360 mm on Z2. Rapid traverse rates of 20 m/min on X1/Z1 and Z2, 12 m/min on Y1 and X2 keep non-cutting time tight. Maximum machining length is 100 mm. Input power is 29 kVA with AC 200/220 V supply and 100 A fuse capacity.

At 3,000 kg with a floor space of 2,278 x 1,450 mm and machine height of only 1,620 mm, the BNA-42MSY2 is remarkably compact for its capability level. The low profile and small footprint make it one of the easiest dual-spindle mill-turn machines to install in existing production cells.

The MSY2 generation is Citizen's answer to shops that want twin-turret cycle time performance without twin-turret cost and complexity. The 2-tool simultaneous cutting capability through superimposition control enables the turret to serve both spindles in an overlapping fashion, achieving 70-85% of the cycle time reduction that a twin-turret machine would provide. For shops where that last 15-30% of cycle time savings does not justify the $50,000-$80,000 twin-turret premium, the BNA-42MSY2 is the optimal choice.

Full Specifications

Parameter	Value
Max Bar Capacity Sp1	42 mm (1.65 in)
Max Bar Capacity Sp2	34 mm (1.34 in), 42 mm optional
Max Machining Length	100 mm (3.94 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 (single clutch live tools)
Live Tool Stations	8
Live Tool Speed	6,000 RPM
Live Tool Power	1.0 kW (12 Nm)
Travel X1	140 mm (5.51 in)
Travel Z1	235 mm (9.25 in)
Travel Y1	70 mm (+/-35 mm)
Travel X2	129 mm (5.08 in)
Travel Z2	360 mm (14.17 in)
Rapid Traverse X1 Z1 Z2	20 m/min (787 ipm)
Rapid Traverse Y1 X2	12 m/min (472 ipm)
Machine Weight	3,000 kg (6,614 lb)
Floor Space	2,278 Ã 1,450 mm
Machine Height	1,620 mm
Power Consumption	29 kVA
Power Supply	AC 200/220 V, 100 A
CNC Control	Mitsubishi CNC
Item	BNA-42MSY2
Maximum Bar Diameter	â42 mm / â34 mm (â42 opt.)
Standard Machining Length	100 mm
Draw Tube Diameter	â42 mm / â30 mm
Power Chuck Size	5"
Spindle Speed	6,000 / 5,000 minâ»Â¹
Turret Stations Live Tools	8 Stations / 8 Live Tools (Single Clutch)
Tool Spindle Speed	6,000 minâ»Â¹
Shank Size	â¢20 mm / â25 mm
Rapid Feed Rate	12 / 20 m/min
Turret Stroke	140 mm / 235 mm / Â±35 mm
Sub Spindle Stroke	129 mm / 360 mm
Spindle Motor	11/7.5 kW / 5.5/3.7 kW
Live Tool Motor	1.0 kW (12 Nm)
Turret Index Hydraulic Motor	0.75 kW / 0.75 kW
Input Power Fuse Capacity	29 KVA / 100 A
Voltage Air Supply	AC 200/220 V / 0.5 Mpa
Coolant Hydraulic Lube Tank	165 L / 7 L / 2 L
Machine Height Weight	1,620 mm / 3,000 kg

Specifications sourced from marucit.com — verified 2026-03-28

Strengths & Limitations

Strengths

2-tool simultaneous cutting through superimposition delivers 70-85% of twin-turret cycle time reduction at significantly lower acquisition cost
Compact 2,278 x 1,450 mm footprint and 1,620 mm height is among the smallest in the dual-spindle mill-turn class, simplifying installation in existing cells
6,000 RPM live tool speed provides strong cross-milling capability for demanding features like flats, hexagons, and deep cross-holes
Independent X2 axis on the sub-spindle enables true overlap machining with the main spindle during superimposition sequences
3,000 kg weight minimizes foundation requirements compared to heavier twin-turret alternatives in the same bar capacity class
Current-generation MSY2 improvements deliver refined superimposition algorithms and improved thermal stability over the original MSY

Limitations

34 mm standard sub-spindle capacity requires the optional 42 mm upgrade for full-diameter backworking
8 physical turret stations is fewer than the 12-station SY turret, though half-indexing partially compensates
1.0 kW (12 Nm) live tool power limits heavy milling operations on hardened materials
Single turret shared between two spindles cannot match the true simultaneous independence of twin-turret DHY and BNJ machines

Best For

Shops seeking twin-turret-class cycle times without the cost and programming complexity of true dual-turret machines Medical component manufacturers producing precision parts from 42 mm bar with cross-milling, threading, and backworking in a single cycle Automotive production where the MSY2's superimposition capability provides the cycle time reduction needed to win cost-per-part bids Facilities with limited floor space and ceiling height where the MSY2's 2,278 x 1,450 mm footprint and 1,620 mm height are advantages Contract manufacturers running a mix of medium and high-volume parts that benefit from 2-tool simultaneous cutting

Frequently Asked Questions

01 What does a new Citizen Miyano BNA-42MSY2 cost?

New BNA-42MSY2 machines typically range from $175,000 to $260,000 depending on tooling, high-pressure coolant, bar feeder, and parts catcher. The MSY2 generation commands a premium over remaining MSY1 inventory for its improved superimposition performance.

02 How does 2-tool simultaneous cutting work on the MSY2?

The superimposition control synchronizes the sub-spindle movement with the turret to enable overlapping machining on both spindles using the single turret. While the turret cuts on one spindle, the other spindle can position or perform simple operations. This achieves 70-85% of the cycle time savings of a twin-turret machine.

03 Should I choose the MSY2 or the DHY?

Choose the MSY2 if your parts have moderate backworking and the cycle time savings from superimposition are sufficient. Choose the DHY if you need true simultaneous independent machining on both spindles and the 30-50% cycle time reduction justifies the higher cost and programming complexity.

04 What power supply does the BNA-42MSY2 require?

The BNA-42MSY2 requires AC 200/220 V supply with a 100 A fuse capacity and 29 kVA input power. Air supply is 0.5 MPa. These are standard industrial requirements that most machine shops can accommodate without electrical upgrades.