Machine Comparison
Junker JUMAT 3S vs Junker Lean Selection
Junker Group vs Junker Group · CNC Grinding Machines
Summary
The Junker JUMAT 3S and Junker Lean Selection are both from Junker Group's cnc grinding machines lineup, making this a common upgrade or lineup decision for shops already invested in the Junker Group ecosystem. On paper, the Junker JUMAT 3S edges ahead with advantages in 8 of the compared specifications, though real-world performance depends heavily on your specific applications and workholding. Both machines are proven performers in production environments and represent solid investments for shops in the market for a cnc grinding machine.
Specifications Comparison
| Specification | Junker JUMAT 3S | Junker Lean Selection |
|---|---|---|
| Accuracy | 0.001 mm (0.00004 in) | 0.001 mm (0.00004 in) |
| Control | Siemens Sinumerik 840D sl with Junker overlay | Siemens Sinumerik 840D sl with Junker overlay |
| Grinding Type | OD/ID Cylindrical (CBN/Diamond high-speed) | OD Cylindrical (CBN/conventional, multiple configurations) |
| Center Distance | 600 mm (23.6 in) ▲ | 400 - 1,000 mm (15.7 - 39.4 in) depending on model |
| Max Grinding Length | 400 mm (15.7 in) ▲ | 350 - 800 mm (13.8 - 31.5 in) depending on model |
| Center Height | 175 mm (6.9 in) | 175 mm (6.9 in) |
| Max Workpiece Diameter | 350 mm (13.8 in) | 350 mm (13.8 in) |
| Grinding Wheel Speed | Up to 140 m/s peripheral speed ▲ | Up to 120 m/s peripheral speed |
| Grinding Spindle Power | 30 kW (40 hp) continuous ▲ | 15 - 22 kW (20 - 30 hp) continuous |
| Workhead Speed | Up to 3,000 RPM ▲ | Up to 2,000 RPM |
| Number Of Axes | 4 CNC axes (X, Z, B, C) ▲ | 3-4 CNC axes (X, Z, C optional) |
| Machine Weight | 7,500 kg (16,535 lb) ▲ | 5,000 - 6,500 kg (11,023 - 14,330 lb) |
| Machine Dimensions | 3,800 x 2,200 x 2,100 mm (149.6 x 86.6 x 82.7 in) ▲ | 3,200 x 2,000 x 2,000 mm (126.0 x 78.7 x 78.7 in) |
| Price Range | $350,000 - $500,000 | $180,000 - $300,000 ▲ |
Advantages
Junker JUMAT 3S
- Superior center distance at 600 mm (23.6 in) vs 400 - 1,000 mm (15.7 - 39.4 in) depending on model
- Superior max grinding length at 400 mm (15.7 in) vs 350 - 800 mm (13.8 - 31.5 in) depending on model
- Superior grinding wheel speed at Up to 140 m/s peripheral speed vs Up to 120 m/s peripheral speed
- Superior grinding spindle power at 30 kW (40 hp) continuous vs 15 - 22 kW (20 - 30 hp) continuous
- Superior workhead speed at Up to 3,000 RPM vs Up to 2,000 RPM
Junker Lean Selection
- More competitive pricing at $180,000 - $300,000 compared to $350,000 - $500,000
- Backed by Junker Group's dealer and service network for parts and support
- Job shops and contract manufacturers looking to add CBN cylindrical grinding capability without a $400K+ investment
Verdict
The Junker JUMAT 3S holds a spec advantage in this comparison, but the right choice depends on your shop's priorities. If the Junker JUMAT 3S's strengths in areas like center distance and max grinding length align with your work, it's the clear pick. The Junker Lean Selection may still win on dealer proximity, existing tooling compatibility, or specific features that matter most to your applications. Request quotes from both dealers and, if possible, run your actual parts on each machine before deciding.