Machine Comparison
Citizen Miyano BNC-42 vs Citizen Miyano BND-51SY
Citizen Machinery vs Citizen Machinery · CNC Lathes
Summary
The Citizen Miyano BNC-42 and BND-51SY are listed in different categories and serve different jobs. The BNC-42 is a compact chucking lathe for small precision parts and second operations, with 42 mm (1.65 in) bar capacity. The BND-51SY is a mid-size dual-spindle mill-turn machine for 51 mm (2.0 in) bar and shaft-type parts up to 320 mm (12.60 in) long. Both run Mitsubishi controls, 5,000 RPM live tools and 20 m/min rapids.
The BND-51SY is larger and more powerful: 175 mm (6.89 in) of X travel against 135 mm, 320 mm of turning length against 80 mm (3.15 in), a 15/11 kW (20/15 hp) spindle against 5.5 kW (7.5 hp), and 12 tools against 8. The BNC-42's one table advantage is spindle speed, 6,000 RPM against 5,000 RPM.
Specifications Comparison
| Specification | Citizen Miyano BNC-42 | Citizen Miyano BND-51SY |
|---|---|---|
| X-Axis Travel | 135 mm | 175 mm (6.89 in) ▲ |
| Max Turning Length | 80 mm (3.15 in) | 320 mm (12.60 in) ▲ |
| Bar Capacity | 42 mm (1.65 in) | 51 mm (2.0 in) ▲ |
| Max Spindle Speed | 6,000 RPM ▲ | 50 - 5,000 RPM |
| Spindle Power | 5.5 kW (7.5 hp) | 15/11 kW (20/15 hp) ▲ |
| Live Tool Speed | 50 - 5,000 RPM | 5,000 RPM |
| Tool Capacity | 8 | 12 ▲ |
| Rapid Traverse | 20 m/min | 20 m/min (787 ipm) |
| Control | Mitsubishi M80 (Citizen Miyano) | Mitsubishi CNC |
Advantages
Citizen Miyano BNC-42
- 6,000 RPM main spindle against 5,000 RPM
- Compact chucking layout for second-operation work on parts from Swiss machines
Citizen Miyano BND-51SY
- 320 mm (12.60 in) turning length against 80 mm (3.15 in)
- 51 mm (2.0 in) bar capacity against 42 mm (1.65 in)
- 15/11 kW (20/15 hp) spindle against 5.5 kW (7.5 hp)
- 12 tools against 8, and 175 mm (6.89 in) of X travel against 135 mm
Verdict
Choose the BNC-42 for small chucked parts such as sensor housings, injector bodies and connector components, or for second operations on Swiss-turned parts, where a 6,000 RPM spindle and compact layout are what matter. Choose the BND-51SY for larger fittings, valve bodies and transmission shafts from bar up to 51 mm, where 320 mm of turning length, a sub-spindle and a 15/11 kW spindle let the part be finished front and back in one setup.