Machine Comparison
Okuma GI-10NII vs Okuma GI-20NII
Okuma vs Okuma · CNC Grinding Machines
Summary
The Okuma GI-10NII and the Okuma GI-20NII are both Okuma CNC internal grinders, and Okuma publishes few comparable figures for this pair: the only row the two machines share is rapid traverse. There the GI-10NII is faster, at 20 m/min (787 ipm) against 12 m/min (472 ipm).
Beyond that row, the difference is one of intended work. The GI-10NII is the smaller machine, aimed at short-cycle production grinding of bushings, rings and gear bores. The GI-20NII is aimed at longer bores, and at small-bore work with high-frequency spindles.
Specifications Comparison
| Specification | Okuma GI-10NII | Okuma GI-20NII |
|---|---|---|
| Rapid Traverse | 20 m/min (787 ipm) ▲ | 12 m/min (472 ipm) |
Advantages
Okuma GI-10NII
- Rapid traverse of 20 m/min (787 ipm) against 12 m/min (472 ipm)
- Aimed at short-cycle production grinding of bushings, rings and gear bores
Okuma GI-20NII
- Aimed at longer bores than the GI-10NII, with a center rest option for the longest
- Suited to small-bore work with high-frequency spindles
Verdict
With one shared row, the table settles only speed of movement: the Okuma GI-10NII rapids at 20 m/min (787 ipm) against 12 m/min (472 ipm), which favors it for short-cycle production of small bores. Choose the Okuma GI-20NII when the bores are longer than the smaller machine is meant for. For grinding capacity itself, read the two machine pages, since those figures are not published in a common form.