Tsugami BW128Z-I
Key Specifications
max machinable diameter
axes
main spindle speed
back spindle speed
main spindle motor
tool positions
Overview
The Tsugami BW128Z-I is a 9-axis Swiss-type CNC automatic lathe with a 12 mm (0.47 in) maximum machinable diameter and independent opposed tool posts. The 'I' suffix marks it as the first generation of Tsugami's BW128Z platform, which introduced Z-axis movement on the rear tool post for enhanced simultaneous machining capability in the 12 mm class.
With 9 axes and 3-path simultaneous control, the BW128Z-I runs turning, back-working, and rear tool post operations concurrently. The Z suffix is the key differentiator here — it means the rear tool post has its own Z-axis travel, enabling center alignment and additional machining operations that aren't possible on the non-Z variants. Main and back spindle speeds hit 12,000 RPM with a 2.2/3.7 kW motor, delivering strong performance for small-diameter precision parts.
The machine carries 24 tool positions and runs rapid traverse rates of 24 m/min on the Y1 and Y3 axes, 15 m/min on Y2, and 12 m/min on the X1, X3, and Z3 axes. The guide bushing system is selectable, allowing conversion between Swiss-mode for long parts and guide-bushless for shorter work. This flexibility is valuable in job shops handling diverse part mixes.
Physically, the BW128Z-I is a compact machine at 2,010 x 1,505 x 1,750 mm and 2,850 kg (6,283 lbs). It's designed for high-volume production environments like medical device, electronics, and connector manufacturing where cycle time reduction through simultaneous multi-path control directly impacts profitability. The independent opposed tool post design cuts non-cutting time compared to traditional turret-based Swiss machines.
Full Specifications
| Parameter | Value |
|---|---|
| Max Machinable Diameter | 3-12 mm (0.12-0.47 in) |
| Axes | 9 axes |
| Main Spindle Speed | 200-12,000 RPM |
| Back Spindle Speed | 200-12,000 RPM |
| Main Spindle Motor | 2.2/3.7 kW (3/5 hp) |
| Tool Positions | 24 |
| Rapid Traverse Rate | 24 m/min (Y1, Y3); 15 m/min (Y2); 12 m/min (X1, X3, Z3) |
| Guide Bushing | Yes (selectable) |
| Machine Weight | 2,850 kg (6,283 lbs) |
| Dimensions | 2,010 x 1,505 x 1,750 mm (79.1 x 59.3 x 68.9 in) |
Specifications sourced from tsugami.co.jp — verified 2026-03-28
Strengths & Limitations
Strengths
- 9-axis 3-path simultaneous control enables three concurrent operations to minimize cycle times on complex small parts
- 12,000 RPM main and back spindle speeds provide excellent performance for small-diameter brass, aluminum, and stainless work
- Z-axis movement on rear tool post enables center alignment and additional simultaneous machining not available on non-Z models
- Independent opposed tool posts eliminate shared turret indexing delays for faster tool-to-tool transitions
- Compact footprint at 2,010 x 1,505 mm fits well in shops running multiple Swiss machines in tight floor space
- Selectable guide bushing system provides flexibility for both long and short parts
Limitations
- 24 tool positions is fewer than the 28-position BW129Z-I variant, potentially requiring more setups for complex parts
- First-generation (I) model has been superseded by the II generation with improvements
- 9-axis programming demands skilled operators and capable multi-channel CAM software
- 12 mm bar capacity limits the machine to small parts — shops needing 20 mm capability need the BW208Z-I or larger
Best For
Frequently Asked Questions
01
The BW128Z-I has 24 tool positions with no live tooling specified, while the BW129Z-I offers 28 tool positions with 9-11 live tool positions and live tool speeds of 8,000/12,000 RPM. The BW129Z-I also has a slightly smaller 1.5/2.2 kW main spindle motor. Choose the BW129Z-I if you need live tooling for cross-drilling and milling.
02
The Z suffix indicates Z-axis movement on the rear tool post. This gives the rear post its own independent Z-axis travel for center alignment and additional simultaneous machining operations. Models without the Z suffix (like the BW128-I) lack this capability, reducing simultaneous machining flexibility.
03
The BW128Z-II is the current generation with improvements. If buying new, you'll get the II version. The I generation is relevant in the used market, where well-maintained units can offer strong value. Check the machine hours, spindle condition, and axis backlash when evaluating used I-generation machines.
04
Yes, the guide bushing system is selectable. You can configure the machine for guide-bushless operation to reduce bar stock waste on shorter parts with low L/D ratios. This is particularly useful in a job shop environment where part lengths vary significantly across different jobs.
