Citizen Miyano BNJ-42
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 It may be a superseded or older model; the specifications below are as we last recorded them.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 Turn Length
max bar capacity
max turning diameter
main spindle speed
sub spindle speed
live tool speed
How much does the Citizen Miyano BNJ-42 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 Miyano BNJ-42 is a two-spindle fixed-headstock lathe built around a spindle slide with 85mm of X2 and 590mm of Z2 travel, run by a Mitsubishi M80W dual-path control. Citizen's current lineup does not include the BNJ-42, so it is mostly a used-machine purchase.
On the front side, turret HD1 has 12 stations and can carry up to 12 revolving tools at 6,000min-1. Its slide moves 165mm on X1 and 246mm on Z1 with a Y stroke of ±40mm, and the table rates it for drilling to 13mm Dia. and tapping to M12×1.75. The HD2 position is smaller: revolving tools to 3,000min-1, drilling to 10mm Dia. and tapping to M10×1.0. Plan the larger holes and threads for HD1 and keep the HD2 work to small cross holes and light back-face operations.
The main spindle takes H-S22 or DIN177E collets and the second spindle JPN, H-S16 or DIN171E collets; the hollow power chucks are 6" and 5". The second spindle handles bar work to 42mm Dia. Chuck work is listed to 200 mm (7.87 in) in diameter, and the standard turning length is 100mm on both spindles, so this is a machine for short parts.
The BNJ-42 weighs 5,300 kg and occupies 2,840×1,560mm without the chip conveyor, at a height of 1,700mm. Rapid traverse is 20 m/min on X and 24 m/min on Z. The Miyano BNE-42, its twin-turret relative, is listed at 7,800kg.
Full Specifications
| Parameter | Value |
|---|---|
| Max Bar Capacity | 42 mm (1.65 in) |
| Max Turning Diameter | 200 mm (7.87 in) chuck work |
| Max Turning Length | 100 mm (3.94 in) |
| Main Spindle Speed | 6,000 RPM |
| Sub Spindle Speed | 6,000 RPM |
| Live Tool Speed | 6,000 RPM |
| Spindle Motor | 7.5 kW (10 hp) |
| Number of Axes | 8 (X1, Z1, Y1, X2, Z2, Y2 + C1, C2) |
| Turret Positions | 24 (12 upper + 12 lower) |
| Rapid Traverse X | 20 m/min |
| Rapid Traverse Z | 24 m/min |
| Machine Weight | 5,300 kg |
| CNC Control | Mitsubishi M80W dual-path (Citizen Miyano) |
| 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.) |
| Floor Space | 2,840×1,560mm(Without Chip Conveyor) |
| 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.) |
| Machine Height | 1,700mm |
| 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
- Spindle slide with 85mm of X2 and 590mm of Z2 travel
- Mitsubishi M80W dual-path control for the two sides of the machine
- 12-station HD1 turret taking up to 12 revolving tools, with a ±40mm Y stroke
- HD1 drills to 13mm Dia. and taps to M12×1.75 with revolving tools at 6,000min-1
- 5,300 kg on 2,840×1,560mm of floor (without chip conveyor)
Limitations
- HD2 revolving tools run to 3,000min-1 and are limited to 10mm Dia. drilling and M10×1.0 tapping
- The standard turning length of 100mm on each spindle rules out long shafts
- The 2,840×1,560mm floor figure excludes the chip conveyor, so plan extra room
Best For
Frequently Asked Questions
01
The Miyano BNJ-42 has a spindle slide with 85mm of X2 and 590mm of Z2 and a Mitsubishi M80W dual-path control. The Miyano BNE-42 is listed with a Mitsubishi M80 control and weighs 7,800kg, against 5,300 kg for the BNJ-42.
02
The table gives the HD2 position revolving tools to 3,000min-1, drilling to 10mm Dia. and tapping to M10×1.0. That covers cross holes, back-face drilling and small threads; larger holes and M12×1.75 taps belong on the HD1 turret.
03
The main spindle takes H-S22 or DIN177E collets, the second spindle JPN, H-S16 or DIN171E collets. Power chucks are hollow, 6" on the main spindle and 5" on the second spindle.
04
2,840×1,560mm without the chip conveyor, with a machine height of 1,700mm and a weight of 5,300 kg. Leave room beyond that for the conveyor and for bar loading at the main spindle.
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