Machine Comparison
Okuma GP-47N vs Okuma GP-57N
Okuma vs Okuma · CNC Grinding Machines
Summary
The Okuma GP-47N and Okuma GP-57N are both from Okuma's cnc grinding machines lineup, making this a common upgrade or lineup decision for shops already invested in the Okuma ecosystem. The Okuma GP-57N leads in x travel (305 mm (12.01 in) vs 275 mm (10.83 in)). The Okuma GP-57N shows specification advantages in 5 categories, though the Okuma GP-47N may still be the better choice depending on your shop's specific needs and the type of work you run. 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 | Okuma GP-47N | Okuma GP-57N |
|---|---|---|
| X-Axis Travel | 275 mm (10.83 in) | 305 mm (12.01 in) ▲ |
| Z-Axis Travel | 525 mm (20.67 in) | 1,050 mm (41.34 in) ▲ |
| Control | Okuma OSP-P300G | Okuma OSP-P300G |
| Max Grinding Diameter | 400 mm (15.7 in) | 500 mm (19.7 in) ▲ |
| Distance Between Centers | 500 mm (19.7 in) | 1,000 mm (39.4 in) ▲ |
| Grinding Wheel Size | 455 x 50 mm (17.9 x 2.0 in) | 510 x 50 mm (20.1 x 2.0 in) ▲ |
| Wheel Speed Max | 45 m/s (8,858 sfm) | 45 m/s (8,858 sfm) |
| Wheelhead Swivel | Programmable angular positioning | Programmable angular positioning |
| Min Feed Increment | 0.0001 mm (0.000004 in) | 0.0001 mm (0.000004 in) |
| Rapid Traverse X | 10 m/min (394 ipm) | 10 m/min (394 ipm) |
| Rapid Traverse Z | 15 m/min (591 ipm) | 15 m/min (591 ipm) |
| Workhead Speed | 10 - 400 RPM | 10 - 350 RPM |
| Workhead Center | MT5 | MT5 |
| Id Grinding Spindle | Optional attachment | Optional attachment |
| Price Range | $250,000 - $350,000 ▲ | $280,000 - $400,000 |
Advantages
Okuma GP-47N
- More competitive pricing at $250,000 - $350,000 compared to $280,000 - $400,000
- Backed by Okuma's dealer and service network for parts and support
- Bearing manufacturers grinding complete bearing rings requiring OD, face, and optional ID grinding in a single setup on one machine
Okuma GP-57N
- Greater x travel of 305 mm (12.01 in) accommodates larger workpieces
- Greater z travel of 1,050 mm (41.34 in) accommodates larger workpieces
- Superior max grinding diameter at 500 mm (19.7 in) vs 400 mm (15.7 in)
- Superior distance between centers at 1,000 mm (39.4 in) vs 500 mm (19.7 in)
- Superior grinding wheel size at 510 x 50 mm (20.1 x 2.0 in) vs 455 x 50 mm (17.9 x 2.0 in)
Verdict
The Okuma GP-57N edges ahead on specifications in this comparison, particularly in X Travel and Z Travel. However, the Okuma GP-47N remains competitive and may be the better choice depending on price, dealer support in your area, or specific workholding and tooling considerations. Both are capable machines — the best decision comes from running your actual parts and evaluating total cost of ownership including tooling, training, and service.