Okuma GP-GA15W
Image: d30jruhmdicmo0.cloudfront.net, Okuma
Key Specifications
Rapid Traverse
max grinding diameter
distance between centers
grinding wheel size
rapid traverse x
rapid traverse z
How much does the Okuma GP-GA15W cost?
Estimated price range
Our best estimate for a cnc grinding machine in this class — not a quote from Okuma. Configuration moves it a long way.
Overview
The Okuma GP-GA15W is a compact cylindrical grinder built around one small envelope: 150 mm (5.91 in) of maximum grinding diameter and 250 mm (9.84 in) between centers. The table offers no choice of bed length, which makes this a machine picked for a known family of short parts.
For work of that size the wheel end is large. The wheel is listed at 510 × 203.2 mm (20 × 8 in) with a 75 mm (3 in) width, on a 7.5 kW (10 hp) wheel spindle motor. That is the motor rating the GP-GA-44FII carries for 400 mm (15.75 in) work, here applied to parts no bigger than 150 mm. A wheel so much larger than the workpiece wears slowly relative to the stock it removes, and a 75 mm face covers a good share of a 250 mm long part in a single plunge. Both point to repeat production, not one-off jobs.
Anything longer goes to the GP-GA25W, which lists 400 or 650 mm (15.75 or 25.59 in) between centers and 200 mm (7.87 in) of grinding diameter.
Full Specifications
| Parameter | Value |
|---|---|
| Max Grinding Diameter | 150 mm (5.91 in) |
| Distance Between Centers | 250 mm (9.84 in) |
| Grinding Wheel Size | 510 × 203.2 mm (20 × 8 in) |
| Rapid Traverse X | 10 m/min (394 ipm) |
| Rapid Traverse Z | 15 m/min (591 ipm) |
| Rapid Traverse Rate | 30 m/min (1,181 ipm) |
| Wheel Spindle Motor | 7.5 kW (10 hp) |
| Grinding Wheel Width | 75 mm (3 in) |
Specifications sourced from okuma.com — verified 2026-10-03
Strengths & Limitations
Strengths
- 510 × 203.2 mm (20 × 8 in) wheel, a large wheel for parts no bigger than 150 mm (5.91 in)
- 7.5 kW (10 hp) wheel spindle motor, the rating the GP-GA-44FII uses for 400 mm (15.75 in) work
- 75 mm (3 in) wheel width against a 250 mm (9.84 in) center distance allows wide plunges on short parts
Limitations
- Only one center distance, 250 mm (9.84 in), is listed
- Grinding diameter stops at 150 mm (5.91 in); the GP-GA25W takes 200 mm (7.87 in)
- No higher wheel motor rating is shown, where the GP-GA25W offers 15 kW (20 hp) as an option
Best For
Frequently Asked Questions
01
150 mm (5.91 in) in diameter and 250 mm (9.84 in) between centers. Those are the only capacity figures in Okuma's headline table, and there is a single center distance, so a part that is even slightly too long belongs on a larger model.
02
The GP-GA15W is the smaller machine: 150 mm (5.91 in) by 250 mm (9.84 in), with a 75 mm (3 in) wide wheel. The GP-GA25W grinds 200 mm (7.87 in), offers 400 or 650 mm (15.75 or 25.59 in) between centers and has a 150 mm (5.9 in) wheel width. Both start with a 7.5 kW (10 hp) wheel motor.
03
The wheel size is listed as 510 × 203.2 mm (20 × 8 in) and the wheel width as 75 mm (3 in). The wheel spindle motor is 7.5 kW (10 hp). On parts limited to 150 mm (5.91 in) in diameter that is a generous wheel, which helps wheel life in long runs.
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