Machine Comparison
Haas ST-15Y vs Haas ST-25Y
Haas Automation vs Haas Automation · CNC Lathes
Summary
The Haas ST-15Y and Haas ST-25Y are Y-axis turning centers with ± 2 in (± 51 mm) of Y travel, a 6,000 rpm sub-spindle, 4,000 rpm live tools, 12 stations and 472 ipm (12 m/min) rapids. The ST-25Y is the larger, higher-torque machine.
The ST-25Y has 22.5 in (572 mm) of Z travel and turning length against 16 in (406 mm), takes 3 in (76 mm) bar against 2.5 in (64 mm), swings 11.75 in (298 mm) against 11 in (279 mm) and carries a 10 in (254 mm) chuck against 8.3 in (210 mm). Its spindle is rated 30 hp (22.4 kW) and 300 ft-lbf @ 500 rpm against 20 hp (14.9 kW) and 150 ft-lbf. The ST-15Y spins faster, 4,000 rpm against 3,400 rpm. Haas lists them at US$108,995 and US$127,995.
Specifications Comparison
| Specification | Haas ST-15Y | Haas ST-25Y |
|---|---|---|
| X-Axis Travel | 7.88 in (200 mm) | 8.4 in (213 mm) ▲ |
| Y-Axis Travel | ± 2 in (± 51 mm) | ± 2 in (± 51 mm) |
| Z-Axis Travel | 16 in (406 mm) | 22.5 in (572 mm) ▲ |
| Max Turning Diameter | 11 in (279 mm) | 11.75 in (298 mm) ▲ |
| Max Turning Length | 16 in (406 mm) | 22.5 in (572 mm) ▲ |
| Bar Capacity | 2.5 in (64 mm) | 3 in (76 mm) ▲ |
| Chuck Size | 8.3 in (210 mm) | 10 in (254 mm) |
| Max Spindle Speed | 4,000 rpm ▲ | 3,400 rpm |
| Spindle Power | 20 hp (14.9 kW) | 30 hp (22.4 kW) ▲ |
| Spindle Torque | 150 ft-lbf @ 500 rpm (203 N·m @ 500 rpm) | 300 ft-lbf @ 500 rpm (407 N·m @ 500 rpm) ▲ |
| Spindle Taper / Nose | A2-6 | A2-6 |
| Sub-Spindle Speed | 6,000 rpm | 6,000 rpm |
| Live Tool Speed | 4,000 rpm | 4,000 rpm |
| Tool Capacity | 12 | 12 |
| Rapid Traverse | 472 ipm (12 m/min) | 472 ipm (12 m/min) |
| Machine Weight | 7,900 lb (3,583 kg) | 12,300 lb (5,580 kg) |
| Published List Price | US$108,995 | US$127,995 |
Advantages
Haas ST-15Y
- 4,000 rpm main spindle against 3,400 rpm
- Lower published list price, US$108,995 against US$127,995
Haas ST-25Y
- 300 ft-lbf (407 N·m) of torque against 150 ft-lbf (203 N·m)
- 30 hp (22.4 kW) spindle against 20 hp (14.9 kW)
- 3 in (76 mm) bar capacity against 2.5 in (64 mm)
- 22.5 in (572 mm) turning length against 16 in (406 mm)
Verdict
Choose the ST-15Y for small, complex parts such as bone screws, implant components and small aerospace fittings, where parts fit within 16 in (406 mm) and 2.5 in (64 mm) bar and the higher 4,000 rpm spindle suits the material. Choose the ST-25Y for steel and stainless components up to 3 in (76 mm) bar that need 300 ft-lbf of torque and 22.5 in (572 mm) of turning length along with milled flats and cross-holes.