Machine Comparison
Okuma GP-47N vs Okuma GP-57N
Okuma vs Okuma · CNC Grinding Machines
Summary
The Okuma GP-47N and the Okuma GP-57N are two sizes in the same family of CNC cylindrical grinders for long shafts. On the figures the table holds they are identical: both are offered with 2,150, 2,650, or 3,150 mm (84.65, 104.33, or 124.02 in) between centers, and both list a 12 m/min (472 ipm) rapid traverse.
Okuma publishes few comparable figures for this pair, and the table has no row for the grinding diameter that separates them. In words: the Okuma GP-57N is for rolls and flanged shafts too large in diameter for the Okuma GP-47N, while the Okuma GP-47N covers shafts, journals and seats of smaller diameter over the same lengths.
Specifications Comparison
| Specification | Okuma GP-47N | Okuma GP-57N |
|---|---|---|
| Rapid Traverse | 12 m/min (472 ipm) | 12 m/min (472 ipm) |
| Distance Between Centers | 2,150, 2,650, or 3,150 mm (84.65, 104.33, or 124.02 in) | 2,150, 2,650, or 3,150 mm (84.65, 104.33, or 124.02 in) |
Advantages
Okuma GP-47N
- Covers shaft, journal and seat work that does not need the larger capacity of the Okuma GP-57N
- Same three bed lengths as the larger machine, up to 3,150 mm (124.02 in) between centers
Okuma GP-57N
- Takes rolls and flanged shafts too large in diameter for the Okuma GP-47N
- Keeps the same 2,150, 2,650, or 3,150 mm between-centers options, so the extra diameter costs no length
Verdict
Choose by the largest diameter you grind. If your shafts, journals and seats all fit the smaller machine, the Okuma GP-47N covers them over the same 2,150, 2,650, or 3,150 mm between centers. If the work includes rolls or flanged shafts whose largest diameter is beyond it, the Okuma GP-57N is the one to buy. Length and rapid traverse, 12 m/min (472 ipm) on both, do not separate them.