Okuma GP-GA-36FII

$230,000 - $310,000 Updated 2026-03-13

Key Specifications

X Travel

275 mm (10.83 in)

Z Travel

1,050 mm (41.34 in)

Rapid Traverse

max grinding diameter

340 mm (13.4 in)

distance between centers

350 / 650 / 1,000 / 1,500

grinding wheel size

510 x 75 mm (20.1 x 3.0 in)

Overview

The Okuma GP-GA-36FII is the longer-bed variant of the GA-34FII, offering 1,000 mm (39.4 in) between centers while maintaining the same 340 mm (13.4 in) maximum grinding diameter. Where the GA-34FII handles compact large-diameter parts, the GA-36FII extends that capability to longer shafts and multi-journal components that need both the larger diameter capacity and extended workpiece length.

The grinding wheel is 510 x 75 mm (20.1 x 3.0 in) with a maximum peripheral speed of 45 m/s (8,858 sfm), identical to the GA-34FII. The longer table provides room for steady rest support positions and multi-plunge grinding sequences along the workpiece length. The wheel spindle uses hydrodynamic bearings for vibration-free grinding across the full traverse range.

The X-axis (infeed) travel is 275 mm (10.83 in) with a minimum feed increment of 0.0001 mm (0.000004 in). The Z-axis (traverse) travel is 1,050 mm (41.34 in), proportionally longer to accommodate the wider center distance. Rapid traverse rates are 10 m/min (394 ipm) on X and 15 m/min (591 ipm) on Z. The headstock provides workpiece rotation from 10 to 400 RPM with an MT5 center.

The FII generation OSP-P300G control handles complex multi-step grinding sequences including multiple plunge positions along the workpiece length, traverse grinding with automatic reversal, and programmable spark-out at each position. Gap elimination and in-process gauging are available. The table swivels +/- 6 degrees for long taper grinding applications.

Machine weight is approximately 7,500 kg (16,535 lb). Floor space runs approximately 4,500 x 2,500 mm (177 x 98 in). New pricing typically ranges from $230,000-$310,000. The GP-GA-36FII competes with Studer S41, Toyoda GE6Pi-II, and Danobat LG-1000 for medium-to-large diameter long-shaft grinding applications.

Full Specifications

Parameter	Value
Max Grinding Diameter	340 mm (13.4 in)
Distance Between Centers	350 / 650 / 1,000 / 1,500
Grinding Wheel Size	510 x 75 mm (20.1 x 3.0 in)
Wheel Speed Max	45 m/s (8,858 sfm)
X-Axis Travel	275 mm (10.83 in)
Z-Axis Travel	1,050 mm (41.34 in)
Min Feed Increment	0.0001 mm (0.000004 in)
Rapid Traverse X	10 m/min (394 ipm)
Rapid Traverse Z	15 m/min (591 ipm)
Workhead Speed	10 - 400 RPM
Workhead Center	MT5
Swivel Angle	+/- 6°
Machine Weight	7,500 kg (16,535 lb)
Floor Space	4,500 x 2,500 mm (177 x 98 in)
CNC Control	Okuma OSP-P300G
Max Grinding Dia	Ø300
Grinding Wheel Odxid	Ø610x254
Max Grinding Wheel Width	150
Rapid Traverse Rate	15
Wheel Spindle Motor	15 [22]
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric

Specifications sourced from okuma.com — verified 2026-03-28

Strengths & Limitations

Strengths

Combines 340 mm grinding diameter with 1,000 mm between centers, handling both large-diameter and long workpieces that neither the GA-34FII nor GA-26W can accommodate
1,050 mm Z-axis traverse enables full-length traverse grinding of long shafts with multiple diameter steps and journal locations
Steady rest accommodation along the longer table prevents deflection on high length-to-diameter ratio workpieces during precision grinding
510 mm grinding wheel provides ample surface area for both traverse and plunge grinding on larger-diameter workpieces
FII generation control with improved gap elimination and multi-step programming reduces cycle times on complex multi-journal shafts
0.0001 mm infeed resolution maintains precision across the larger work envelope without compromise

Limitations

4,500 x 2,500 mm footprint is the largest in the GA series, requiring dedicated floor space in the grinding department
Price premium over the GA-34FII reflects the longer bed rather than additional diameter capacity, so shops not grinding long parts should save with the shorter model
7,500 kg machine weight requires solid floor construction, potentially limiting placement options in multi-story or older facilities
Single wheelhead configuration means multi-diameter long shafts require sequential plunge operations with Z-axis repositioning
No built-in ID grinding capability; internal surfaces require a separate machine or operation

Best For

Automotive manufacturers grinding long crankshafts, transmission mainshafts, and drivetrain components with multiple journal diameters exceeding 250 mm Machine tool builders grinding large-diameter spindle shafts and lead screws requiring both large OD capacity and length exceeding 500 mm Aerospace manufacturers grinding turbine shafts with multiple bearing journal locations spaced across long shaft lengths Heavy equipment manufacturers grinding large pump shafts, hydraulic cylinder rods, and motor armatures with large diameters Roll and cylinder manufacturers grinding medium-diameter rolls for printing, converting, and industrial processing applications

Frequently Asked Questions

01 What does an Okuma GP-GA-36FII cost?

New pricing runs $230,000-$310,000 depending on options. The price premium over the GA-34FII reflects the longer bed and additional Z-axis travel. Steady rests, in-process gauging for multiple positions, and loading automation are common options for production applications.

02 Should I get the GA-34FII or GA-36FII?

Choose based on workpiece length. If your parts fit within 500 mm between centers, the GA-34FII is more compact, less expensive, and occupies less floor space. If you regularly grind shafts longer than 500 mm with diameters up to 340 mm, the GA-36FII is the right machine. Don't pay for length capacity you won't use.

03 Can the GA-36FII grind multiple journals on a single shaft?

Yes. The OSP-P300G control programs multiple plunge grinding positions along the Z-axis, allowing the machine to grind several journal diameters on a multi-step shaft in a single setup. Each position can have independent plunge depths, feed rates, and spark-out times. The 1,050 mm traverse handles journals spaced across up to 1,000 mm of shaft length.

04 How does the GA-36FII compare to a Studer S41?

Both are capable CNC cylindrical grinders for medium-to-large diameter long shafts. The Studer S41 offers optional turret wheelheads and wider configuration flexibility. The Okuma provides competitive pricing and OSP control integration. The Studer typically documents tighter roundness and surface finish specifications. Both are production-proven platforms with strong global service networks.