Citizen Miyano BNJ-42SY
This model was not found in Citizen Machinery's current lineup when we checked on 2026-10-03 (lineup page). It may be a superseded or older model; the specifications below are as we last recorded them.
Image: cmj.citizen.co.jp, Citizen Machinery
Key Specifications
max bar capacity sp1
max bar capacity sp2
max machining length
main spindle speed
main spindle power
sub spindle speed
How much does the Citizen Miyano BNJ-42SY cost?
Estimated price range
Our best estimate for a cnc lathes / turning center in this class — not a quote from Citizen Machinery. Configuration moves it a long way.
Overview
The Citizen Miyano BNJ-42SY is the Y-axis version of the BNJ-42: a small fixed-headstock lathe that takes 42 mm (1.65 in) bar on both spindles and adds 80 mm (+/-40 mm) of Y travel. It no longer appears as its own model in Citizen's current lineup, so treat it as a machine you would buy secondhand and confirm the listed figures on the machine.
Y is what earns it a place over the plain BNJ-42S. Off-centre holes, flats and slots can be milled from the upper turret while the part is still on the main spindle, rather than in a second operation. Drilling capacity is listed at 13 mm on HD1, the upper turret, and 10 mm on HD2, the lower one. Upper-turret live tools run at 6,000 RPM; the lower turret's run at 3,000 RPM, so most of the milling should be planned on HD1.
The main spindle is listed at 60 - 6,000 RPM with a 15/11 kW (20/15 hp) motor. The sub spindle, at 50 - 5,000 RPM and 7.5/5.5 kW (10/7.5 hp), moves on its own slide: 85 mm (3.35 in) in X2 and 590 mm (23.23 in) in Z2. HD1 travels 165 mm (6.50 in) in X1 and 246 mm (9.69 in) in Z1, with 12 stations against 8 on HD2. Maximum machining length is 100 mm (3.94 in).
The current Miyano BNJ-51SY6 keeps this layout and raises SP1 bar capacity to 51 mm dia., with both spindles at 50 - 5,000 rpm. At 5,300 kg and 1,700 mm high on a Mitsubishi M80W dual-path control, the BNJ-42SY is a light machine for its tooling.
Full Specifications
| Parameter | Value |
|---|---|
| Max Bar Capacity Sp1 | 42 mm (1.65 in) |
| Max Bar Capacity Sp2 | 42 mm (1.65 in) |
| Max Machining Length | 100 mm (3.94 in) |
| Main Spindle Speed | 60 - 6,000 RPM |
| Main Spindle Power | 15/11 kW (20/15 hp) |
| Sub Spindle Speed | 50 - 5,000 RPM |
| Sub Spindle Power | 7.5/5.5 kW (10/7.5 hp) |
| Upper Turret Stations | 12 |
| Lower Turret Stations | 8 |
| Upper Turret Live Tool Speed | 6,000 RPM |
| Lower Turret Live Tool Speed | 3,000 RPM |
| Y Axis Travel | 80 mm (+/-40 mm) |
| Travel X1 | 165 mm (6.50 in) |
| Travel Z1 | 246 mm (9.69 in) |
| Travel X2 | 85 mm (3.35 in) |
| Travel Z2 | 590 mm (23.23 in) |
| Max Drilling Hd1 | 13 mm |
| Max Drilling Hd2 | 10 mm |
| Machine Weight | 5,300 kg |
| Floor Space | 2,840×1,560mm(Without Chip Conveyor) |
| Machine Height | 1,700 mm |
| CNC Control | Mitsubishi M80W dual-path |
| Items | BNJ-42S6 |
| Spindle | Spindle Speed Range |
| Sp2 | JPN, H-S16, DIN171E |
| Hd2 | M10×1.0 |
| Revolving Tools | Maximum Number of Revolving Tools |
| Spindle Speed Range | HD1 |
| Maximum Drilling Diameter | HD1 |
| Maximum Tapping Diameter | HD1 |
| Slide Stroke | Turret Slide Stroke |
| Z1 Axis | 246mm |
| Z2 Axis | 590mm |
| Motors | Spindle Motor |
| Sp2 Cs | 7.5/5.5kw(15min./Cont.) |
| Standard Turning Length Sp1 Sp2 | 100mm |
| Standard Machining Diameter Sp1 Sp2 | 51mm Dia./42mm Dia. |
| Spindle Speed Range Sp1 | 50 - 5,000min-1 |
| Spindle Speed Range Sp2 | 50 - 5,000min-1 |
| Type of Collet Chuck Sp1 | H-S22, DIN177E |
| Type of Collet Chuck Sp2 | JPN, H-S16, DIN171E |
| Type of Power Chuck Sp1 Sp2 | 6"/5" Hollow |
| Type of Turret Hd1 | 12st. |
| Type of Turret Hd2 | 8st. |
| Maximum Number of Revolving Tools Hd1 | Max.12 |
| Maximum Number of Revolving Tools Hd2 | Max.4 |
| Spindle Speed Range Hd1 | 6,000min-1 |
| Maximum Drilling Diameterhd1 | 13mm Dia. |
| Maximum Drilling Diameterhd2 | 10mm Dia. |
| Maximum Tapping Diameter Hd1 | M12×1.75 |
| Maximum Tapping Diameter Hd2 | M10×1.0 |
| Turret Slide Stroke X1 Axis | 165mm |
| Turret Slide Stroke Z1 Axis | 246mm |
| Spindle Slide Stroke X2 Axis | 85mm |
| Spindle Slide Stroke Z2 Axis | 590mm |
| Spindle Motor Sp1 Cs | 15/11kw(15min./Cont.) |
| Spindle Motor Sp2 Cs | 7.5/5.5kw(15min./Cont.) |
| Spindle Speed Range Hd2 | 3,000min-1 |
| Maximum Drilling Diameter Hd1 | 13mm Dia. |
| Turret Slide Stroke Y Axis | ±40mm |
| Maximum Drilling Diameter Hd2 | 10mm Dia. |
Specifications compiled from manufacturer literature and industry references. Not independently verified against a published spec sheet — confirm with the manufacturer or an authorised dealer before making a purchasing decision.
Strengths & Limitations
Strengths
- 80 mm (+/-40 mm) of Y travel for off-centre milling and drilling
- Upper-turret live tools at 6,000 RPM with 13 mm drilling capacity
- 42 mm (1.65 in) bar on both spindles, so the sub spindle grips at full size
- Sub spindle slide with 590 mm (23.23 in) of Z2 travel
- Light at 5,300 kg, on a Mitsubishi M80W dual-path control
Limitations
- No longer shown as its own model in Citizen's current lineup
- Lower-turret live tools run at 3,000 RPM and drill to 10 mm, so milling capacity is mostly on HD1
- Maximum machining length of 100 mm (3.94 in) keeps parts short
- Bar capacity is 42 mm (1.65 in); the Miyano BNJ-51SY6 takes 51 mm dia. on SP1
Best For
Frequently Asked Questions
01
The listed Y-axis travel is 80 mm (+/-40 mm). It lets the upper turret drill and mill off the spindle centre line, for flats, slots and cross holes that do not pass through the axis, in the same cycle as the turning.
02
Maximum drilling diameter is listed at 13 mm on HD1 and 10 mm on HD2. HD1 live tools run at 6,000 RPM and HD2 live tools at 3,000 RPM, so the bigger holes and the milling belong on HD1.
03
The Miyano BNJ-51SY6 takes 51 mm dia. bar on SP1 and 42 mm dia. on SP2, with both spindles at 50 - 5,000 rpm and the same ±40 mm Y stroke. The BNJ-42SY takes 42 mm (1.65 in) on both spindles and lists its main spindle at 60 - 6,000 RPM.
04
The listed weight is 5,300 kg, the height 1,700 mm and the floor space 2,840×1,560mm without chip conveyor. Add room for the conveyor and a bar feeder when laying out the cell.
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