Citizen Miyano BNJ-51
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 It may be a superseded or older model; the specifications below are as we last recorded them.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 sp1
max bar capacity sp2
main spindle speed
main spindle power
sub spindle speed
How much does the Citizen Miyano BNJ-51 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-51 is a 51 mm (2.0 in) bar-capacity lathe with two spindles, an upper 12-station turret and a lower 8-station turret, run by a Mitsubishi M80W dual-path control. It is not in Citizen's current lineup and is usually bought second-hand.
The main spindle is rated 15/11 kW (20/15 hp) on its 15min./Cont. ratings and turns to 5,000 RPM. The sub spindle has half that rating, 7.5/5.5 kW (10/7.5 hp), with the same 5,000 RPM limit. That split suits a process in which the main spindle does the roughing and the sub spindle finishes the back face.
The two turrets are not equal. The upper one can hold up to 12 revolving tools at 6,000 RPM, drills to 13 mm and taps to M12×1.75. The lower one takes at most 4 revolving tools, runs them to 3,000 RPM and stops at 10 mm drilling and M10×1.0 tapping. Count the driven tools a part needs on the back side before committing it to this machine.
The turret slide moves 165 mm on X1 and 246 mm on Z1 with a ±40mm Y stroke, and the spindle slide 85 mm on X2 and 590 mm on Z2. Chuck work is listed to 250 mm (9.84 in) in diameter, with collets of the H-S22 or DIN177E type on the main spindle. The machine weighs 5,300 kg on 2,840×1,560mm of floor (without chip conveyor), where the Miyano BNE-51 is listed at 7,800kg.
Full Specifications
| Parameter | Value |
|---|---|
| Max Bar Capacity Sp1 | 51 mm (2.0 in) |
| Max Bar Capacity Sp2 | 51 mm (2.0 in) |
| Main Spindle Speed | 5,000 RPM |
| Main Spindle Power | 15/11 kW (20/15 hp) |
| Sub Spindle Speed | 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 |
| Max Drilling Hd1 | 13 mm |
| Max Drilling Hd2 | 10 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) |
| 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. |
| Max Bar Capacity | 51 mm (2.0 in) |
| Max Turning Diameter | 250 mm (9.84 in) chuck work |
| Max Turning Length | 130 mm (5.12 in) |
| Live Tool Speed | 6,000 RPM |
| Spindle Motor | 11 kW (15 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 |
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
- Main spindle rated 15/11 kW (20/15 hp) on its 15min./Cont. ratings, to 5,000 RPM
- Upper 12-station turret with up to 12 revolving tools at 6,000 RPM, drilling to 13 mm and tapping to M12×1.75
- A lower 8-station turret adds positions for back-side work, up to 4 of them driven
- Spindle slide with 590 mm of Z2 travel
- Mitsubishi M80W dual-path control
Limitations
- Lower-turret revolving tools are limited to 3,000 RPM, 10 mm drilling and M10×1.0 tapping
- Only 4 driven positions on the lower turret
- The sub spindle has half the main spindle's rating at 7.5/5.5 kW (10/7.5 hp)
Best For
Frequently Asked Questions
01
Up to 12 on the upper 12-station turret, running to 6,000 RPM, and up to 4 on the lower 8-station turret, running to 3,000 RPM. Plan back-side milling and cross drilling around those 4 lower positions and their 10 mm drilling and M10×1.0 tapping limits.
02
The Miyano BNJ-51 weighs 5,300 kg and runs a Mitsubishi M80W dual-path control. The Miyano BNE-51 weighs 7,800kg and is listed with a Mitsubishi M80. Both are listed for chuck work to 250 mm (9.84 in), revolving tools to 6,000 RPM and rapids of 20 m/min on X and 24 m/min on Z.
03
The main spindle is rated 15/11 kW (20/15 hp) and the sub spindle 7.5/5.5 kW (10/7.5 hp), both given as 15min./Cont. ratings. Both turn to 5,000 RPM, so the difference is power for roughing rather than speed.
04
The turret slide moves 165 mm on X1 and 246 mm on Z1 with a Y stroke of ±40mm. The spindle slide moves 85 mm on X2 and 590 mm on Z2. Rapid traverse is 20 m/min on X and 24 m/min on Z.
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