Okuma GP-67N
Image: okuma.com, Okuma
Key Specifications
max grinding diameter
distance between centers
grinding wheel size
rapid traverse x
rapid traverse z
rapid traversex
How much does the Okuma GP-67N 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-67N is the largest of Okuma's three long-bed cylindrical grinders, with a maximum grinding diameter of 650 mm (25.59 in) and 2,150, 2,650, or 3,150 mm (84.65, 104.33, or 124.02 in) between centers.
At that swing the workpiece can be nearly as large as the wheel that grinds it. The wheel size is listed as 760 × 304.8 mm (29.925 × 12 in) with a 130 mm (5.12 in) width, and the wheel spindle motor is 15 kW (20 hp). Those are the wheel width and motor the GP-47N lists for 400 mm (15.75 in) work, so on a full-diameter part the GP-67N spreads the same grinding power over a good deal more surface. Plan cycle times on that basis.
Rapid traverse is 12 m/min (472 ipm) in X and 10 m/min (394 ipm) in Z. Okuma's headline figures stop there. Work weight between centers, workhead speed and floor space are in the brochure sheet, and on a machine sized for parts this heavy they should be read before anything else.
Full Specifications
| Parameter | Value |
|---|---|
| Max Grinding Diameter | 650 mm (25.59 in) |
| Distance Between Centers | 2,150, 2,650, or 3,150 mm (84.65, 104.33, or 124.02 in) |
| Grinding Wheel Size | 760 × 304.8 mm (29.925 × 12 in) |
| Rapid Traverse X | 12 m/min (472 ipm) |
| Rapid Traverse Z | 10 m/min (394 ipm) |
| Rapid Traversex | 12 |
| Rapid Traversez | 10 |
| Wheel Spindle Motor | 15 kW (20 hp) |
| Grinding Wheel Width | 130 mm (5.12 in) |
Specifications sourced from okuma.com — verified 2026-10-03
Strengths & Limitations
Strengths
- 650 mm (25.59 in) maximum grinding diameter, the largest of the three sizes and ahead of the GP-57N at 550 mm (21.65 in)
- Beds with 2,150, 2,650, or 3,150 mm (84.65, 104.33, or 124.02 in) between centers
- 130 mm (5.12 in) wheel width on a wheel listed at 760 × 304.8 mm (29.925 × 12 in)
Limitations
- The 15 kW (20 hp) wheel motor is unchanged from the GP-47N, which grinds only 400 mm (15.75 in)
- Z rapid traverse of 10 m/min (394 ipm) on beds as long as 3,150 mm (124.02 in)
- Okuma's headline figures give no work weight or workhead speed for this size
Best For
Frequently Asked Questions
01
Up to 650 mm (25.59 in) in grinding diameter, on a bed with 2,150, 2,650, or 3,150 mm (84.65, 104.33, or 124.02 in) between centers. The maximum work weight is not among the headline figures, and for rolls of this diameter it needs to be confirmed with Okuma.
02
Not at the wheel. The wheel spindle motor is 15 kW (20 hp) and the wheel width 130 mm (5.12 in), which is what the GP-47N and GP-57N list as well. The larger model buys diameter capacity, so grinding a 650 mm surface takes longer than a smaller one at the same stock allowance.
03
12 m/min (472 ipm) in X and 10 m/min (394 ipm) in Z. On the longest bed, 3,150 mm (124.02 in) between centers, moves from one end of a roll to the other are a noticeable part of a traverse grinding cycle.
Comparisons
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