Machine Comparison
Okuma GP-57N vs Okuma GP-67N
Okuma vs Okuma · CNC Grinding Machines
Summary
The Okuma GP-57N and Okuma GP-67N 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-67N leads in x travel (340 mm (13.39 in) vs 305 mm (12.01 in)). The Okuma GP-67N shows specification advantages in 5 categories, though the Okuma GP-57N 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-57N | Okuma GP-67N |
|---|---|---|
| X-Axis Travel | 305 mm (12.01 in) | 340 mm (13.39 in) ▲ |
| Z-Axis Travel | 1,050 mm (41.34 in) | 1,550 mm (61.02 in) ▲ |
| Control | Okuma OSP-P300G | Okuma OSP-P300G |
| Max Grinding Diameter | 500 mm (19.7 in) | 600 mm (23.6 in) ▲ |
| Distance Between Centers | 1,000 mm (39.4 in) | 1,500 mm (59.1 in) ▲ |
| Grinding Wheel Size | 510 x 50 mm (20.1 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) ▲ | 12 m/min (472 ipm) |
| Workhead Speed | 10 - 350 RPM | 10 - 300 RPM |
| Workhead Center | MT5 | MT6 ▲ |
| Id Grinding Spindle | Optional attachment | Optional attachment |
| Price Range | $280,000 - $400,000 ▲ | $350,000 - $500,000 |
Advantages
Okuma GP-57N
- Superior rapid traverse z at 15 m/min (591 ipm) vs 12 m/min (472 ipm)
- More competitive pricing at $280,000 - $400,000 compared to $350,000 - $500,000
- Backed by Okuma's dealer and service network for parts and support
- Heavy equipment manufacturers grinding large pump shafts, hydraulic cylinder components, and gear blanks requiring both OD and shoulder grinding on parts up to 500 mm diameter
Okuma GP-67N
- Greater x travel of 340 mm (13.39 in) accommodates larger workpieces
- Greater z travel of 1,550 mm (61.02 in) accommodates larger workpieces
- Superior max grinding diameter at 600 mm (23.6 in) vs 500 mm (19.7 in)
- Superior distance between centers at 1,500 mm (59.1 in) vs 1,000 mm (39.4 in)
- Superior workhead center at MT6 vs MT5
Verdict
The Okuma GP-67N edges ahead on specifications in this comparison, particularly in X Travel and Z Travel. However, the Okuma GP-57N 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.