Citizen Miyano BNA-42SY
Image: cmj.citizen.co.jp, Citizen Machinery
Key Specifications
max machining length
standard machining diameter chuck diameter sp1
standard machining diameter chuck diameter sp2
turret slide travel distance x axis
turret slide travel distance z axis
turret slide travel distance y axis
How much does the Citizen Miyano BNA-42SY cost?
Estimated price range
Our best estimate for a mill-turn / multi-tasking machine in this class — not a quote from Citizen Machinery. Configuration moves it a long way.
Overview
The Miyano BNA-42SY is a dual-spindle, single-turret lathe for 42 mm dia. work on the first spindle and 34 mm dia. on the second, with a 12-station turret, up to 12 rotary tools and a Y stroke of 70 (±35) mm. Citizen describes the SY type as having improved performance for bar-material processing, and says the base and turret rigidity have been increased to improve basic functions.
With one turret serving two spindles, the trade is simplicity against cycle time: the second spindle's work runs after the first spindle's rather than at the same moment. What it gains is a long reach. The turret slide travels 140 mm on X and 285 mm on Z, and the back spindle slide travels 360 mm on its B (Z2) axis, against a maximum machining length of 100 mm.
The first spindle runs 60 - 6,000 rpm on 11/7.5/5.5 kW (15%/15min/cont.), so 5.5 kW is the continuous figure. The second runs 50 - 5,000 rpm on 5.5/3.7 kW (15min/cont.). Chuck sizes are 5" and 4". Rotary tools run 50 - 5,000 rpm on a 2.8/1.0 kW motor, and the turret takes 20 mm Sq. turning tools with 25 mm dia. tool post holes.
Rapids are 20 m/min on X, Z and B (Z2) and 12 m/min on Y. The machine needs 26 kVA, W2,350 × D1,433 mm of floor and 1,745 mm of height, and it weighs 3,880 kg. The single-spindle Miyano BNA-42CY is lighter at 3,220 kg; the two-turret Miyano ANX-42SYY weighs 6,250 kg.
Full Specifications
| Parameter | Value |
|---|---|
| Max Machining Length | 100 mm |
| Standard Machining Diameter Chuck Diameter Sp1 | 42 mm dia. |
| Standard Machining Diameter Chuck Diameter Sp2 | 34 mm dia. |
| Turret Slide Travel Distance X Axis | 140 mm |
| Turret Slide Travel Distance Z Axis | 285 mm |
| Turret Slide Travel Distance Y Axis | 70 (±35) mm |
| Back Spindle Slide Travel Distance B Z2 Axis | 360 mm |
| Number of Spindles | 2 |
| Spindle Speed Sp1 | 60 - 6,000 rpm |
| Spindle Speed Sp2 | 50 - 5,000 rpm |
| Collet Chuck Size Sp1 | 5" |
| Collet Chuck Size Sp2 | 4" |
| Number of Tool Posts | 1 |
| Type of Tool Post | 12 ST. |
| Dimensions of Tools Used | 20 mm Sq. |
| Dimensions of Tool Post Holes | 25 mm dia. |
| Number of Installed Rotary Tools | max. 12 |
| Rotating Speed of Rotary Tools | 50 - 5,000 rpm |
| Rapid Feed Rate X Axis | 20 m/min |
| Rapid Feed Rate Z Axis | 20 m/min |
| Rapid Feed Rate Y Axis | 12 m/min |
| Rapid Feed Rate B Z2 Axis | 20 m/min |
| Spindle Motor Sp1 | 11/7.5/5.5 kW(15%/15min/cont.) |
| Spindle Motor Sp2 | 5.5/3.7 kW(15min/cont.) |
| Rotary Tools Motor | 2.8/1.0 kW |
| Power Requirement | 26 kVA |
| Machine Height | 1,745 mm |
| Required Floor Surface Area | W2,350 × D1,433 mm |
| Machine Weight | 3,880 kg |
Specifications sourced from cmj.citizen.co.jp — verified 2026-10-03
Strengths & Limitations
Strengths
- Two spindles for front and back work: 42 mm dia. and 34 mm dia.
- 12-station turret taking up to 12 rotary tools at 50 - 5,000 rpm
- Y stroke of 70 (±35) mm and 285 mm of Z travel on the turret slide
- Back spindle slide with 360 mm of B (Z2) travel
- Citizen states increased base and turret rigidity for the SY type
Limitations
- One turret serves both spindles, so front and back operations run in sequence
- Second spindle limited to 34 mm dia. and 5.5/3.7 kW (15min/cont.)
- Rotary tool motor rated 2.8/1.0 kW, so milling is light
- Y rapid of 12 m/min against 20 m/min on X and Z
Best For
Frequently Asked Questions
01
Citizen describes it as a dual-spindle machine with a single turret tool post. The 12-station turret serves both the 42 mm dia. first spindle and the 34 mm dia. second spindle, and holds up to 12 rotary tools.
02
The Miyano BNA-42CY has a 60 - 6,000 rpm spindle and weighs 3,220 kg. The BNA-42SY adds a second spindle running 50 - 5,000 rpm on a slide with 360 mm of B (Z2) travel, and weighs 3,880 kg.
03
The first spindle motor is rated 11/7.5/5.5 kW (15%/15min/cont.), with 5.5 kW as the continuous rating. The second spindle is rated 5.5/3.7 kW (15min/cont.).
04
A 26 kVA supply, a floor area of W2,350 × D1,433 mm and 1,745 mm of height for a machine of 3,880 kg. Leave room beyond that for bar loading and chip removal.
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