Okuma GI-10NII

Est. $180,000 - $260,000 Specs verified 2026-10-03 · okuma.com Updated 2026-10-03

Image: d30jruhmdicmo0.cloudfront.net, Okuma

Key Specifications

min bore diameter

10 mm (0.4 in)

bore range

3-150 mm (0.118-5.91 in)

max grinding length

150 mm (5.91 in)

workhead spindle bore

70 mm (2.76 in)

rapid traverse x

20 m/min (787 ipm)

rapid traverse z

30 m/min (1,181 ipm)

How much does the Okuma GI-10NII cost?

Estimated price range

Est.$180,000 - $260,000

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 GI-10NII is a CNC internal grinder for small and medium bores. Its bore range extends to 150 mm (5.91 in) in diameter, the maximum grinding length is 150 mm (5.91 in), and the workhead spindle has a 70 mm (2.76 in) bore.

Those three figures outline the work. Bore diameter and grinding depth top out at the same 150 mm, so at the upper end of its range the machine grinds bores as deep as they are wide, and proportionally much deeper ones on small diameters, where the stiffness of the wheel quill becomes the practical limit before travel does. The 70 mm workhead bore decides what can pass back into the spindle, which matters for shaft-type parts ground on an internal diameter at one end.

Rapid traverse is 20 m/min (787 ipm) on X and 30 m/min (1,181 ipm) on Z. The GI-20NII, the larger machine in the range, is listed at 12 m/min (472 ipm). On a grinder the rapid rate shows up in the non-grinding part of the cycle: retracting the wheel for gauging, dressing and part change. In high-volume bore grinding those moves are a real share of the cycle. Okuma's headline rows give no wheel-spindle speed or workhead speed, so both should be confirmed for the bore sizes planned.

Full Specifications

Parameter	Value
Min Bore Diameter	10 mm (0.4 in)
Bore Range	3-150 mm (0.118-5.91 in)
Max Grinding Length	150 mm (5.91 in)
Workhead Spindle Bore	70 mm (2.76 in)
Rapid Traverse X	20 m/min (787 ipm)
Rapid Traverse Z	30 m/min (1,181 ipm)

Specifications sourced from okuma.com — verified 2026-10-03

Strengths & Limitations

Strengths

Bore range reaches 150 mm (5.91 in) with a 150 mm (5.91 in) maximum grinding length
Rapid traverse of 30 m/min (1,181 ipm) on Z and 20 m/min (787 ipm) on X, above the 12 m/min (472 ipm) of the GI-20NII
70 mm (2.76 in) workhead spindle bore lets longer parts pass into the spindle

Limitations

Maximum grinding length is 150 mm (5.91 in), so deeper bores are out of range
Parts wider than 70 mm (2.76 in) cannot pass through the workhead spindle
Okuma's headline rows list no wheel-spindle speed, control or workhead speed for this model

Best For

Internal grinding of bores up to 150 mm (5.91 in) in diameter Short-cycle production grinding that benefits from 30 m/min (1,181 ipm) Z rapids Bushings, rings and gear bores within a 150 mm (5.91 in) grinding length

Frequently Asked Questions

01 What bore sizes can the GI-10NII grind?

Okuma's bore range for the GI-10NII runs up to 150 mm (5.91 in) in diameter, and the maximum grinding length is also 150 mm (5.91 in). The smallest practical bore depends on the wheel spindle and quill fitted, so confirm the lower limit with Okuma for the spindle being quoted.

02 How fast are the axes of the GI-10NII?

Rapid traverse is 20 m/min (787 ipm) on X and 30 m/min (1,181 ipm) on Z. The larger GI-20NII is listed at 12 m/min (472 ipm), so the GI-10NII is the quicker of the two between grinding passes.

03 What is the workhead spindle bore of the GI-10NII?

70 mm (2.76 in). That is the opening through the workhead spindle, and it sets the largest diameter of part or workholding component that can extend back into the spindle.