Machine Comparison
Haas DS-20Y vs Haas ST-40Y
Haas Automation vs Haas Automation · Mill-Turn Machines
Summary
The Haas DS-20Y and Haas ST-40Y are in different categories and serve different jobs. The DS-20Y is a dual-spindle Y-axis mill-turn machine for done-in-one bar work up to 2.5 in (64 mm). The ST-40Y is a large single-spindle Y-axis lathe with a 27.5 in (699 mm) turning diameter and 44 in (1,118 mm) of turning length.
The ST-40Y has 40 hp (29.8 kW) against 20 hp (14.9 kW), 1,400 ft-lbf @ 150 rpm against 150 ft-lbf, a 15 in chuck against 8.3 in, 4 in (102 mm) bar against 2.5 in, and ± 3 in of Y travel against ± 2 in. The DS-20Y spins to 4,000 rpm against 2,400 rpm and lists at US$163,995 against US$241,995. Both carry 12 stations and 4,000 rpm live tools.
Specifications Comparison
| Specification | Haas DS-20Y | Haas ST-40Y |
|---|---|---|
| X-Axis Travel | 8.4 in (213 mm) | 20 in (508 mm) ▲ |
| Y-Axis Travel | ± 2 in (± 51 mm) | ± 3 in (± 76 mm) ▲ |
| Z-Axis Travel | 22.5 in (572 mm) | 44 in (1,118 mm) ▲ |
| Max Turning Diameter | 11.75 in (298 mm) | 27.5 in (699 mm) ▲ |
| Max Turning Length | 22.5 in (572 mm) | 44 in (1,118 mm) ▲ |
| Bar Capacity | 2.5 in (64 mm) | 4 in (102 mm) ▲ |
| Chuck Size | 8.3 in (210 mm) | 15 in (381 mm) |
| Max Spindle Speed | 4,000 rpm ▲ | 2,400 rpm |
| Spindle Power | 20 hp (14.9 kW) | 40 hp (29.8 kW) ▲ |
| Spindle Torque | 150 ft-lbf @ 500 rpm (203 N·m @ 500 rpm) | 1,400 ft-lbf @ 150 rpm (1,898 N·m @ 150 rpm) ▲ |
| Spindle Taper / Nose | A2-6 | A2-8 |
| 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) |
| Published List Price | US$163,995 | US$241,995 |
Advantages
Haas DS-20Y
- Second spindle for front and back machining in one cycle
- 4,000 rpm spindle against 2,400 rpm
- Lower list price, US$163,995 against US$241,995
Haas ST-40Y
- 27.5 in (699 mm) turning diameter against 11.75 in (298 mm)
- 44 in (1,118 mm) turning length against 22.5 in (572 mm)
- 40 hp (29.8 kW) and 1,400 ft-lbf against 20 hp (14.9 kW) and 150 ft-lbf
- 4 in (102 mm) bar and 15 in chuck against 2.5 in (64 mm) and 8.3 in
Verdict
These machines do different jobs. The Haas DS-20Y is for production fittings, connectors and valve bodies from bar up to 2.5 in that need both ends machined without a second operation. The Haas ST-40Y is for large forgings, flanges, housings and long shafts up to 27.5 in in diameter and 44 in long, where 1,400 ft-lbf of low-end torque governs the cut.