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The best monozukuri* practices balance
high-accuracy machining and workability

*Craftsmanship-based manufacturing

  • GPW series Plain typePlain type
    GPW series Plain type

    Smaller machine space achieved with use of wheelhead traverse structure

    A wheelhead traverse structure requires a stronger foundation than a table traverse structure. Okuma’s high-rigidity technology meets the conditions needed for a wheelhead traverse structure to achieve a compact body.

    (GA15W)Machine width: 1,550 mm (61.02 in.), (GA26W)Machine width: 2,510 mm (98.82 in.)(DBC: 650 mm (25.59 in.))
  • GAW series Angle typeAngle type
    GAW series Angle type

    Superior user-friendly design supports automation

    The upper portion of the front door can accommodate various loader positions. Line flexibility from the space-saving design also contributes to greater automation.

    Superior user-friendly design supports automation
Hydrodynamic bearing provides for heavy-duty and highly accurate grinding—with shorter cycle times
Stress analysis with FEM analysis

Non-round plain bearing wheel spindle with a dynamic pressure structure supports the wheel spindle with wedge-shaped oil film pressure that is generated by wheel spindle rotation. Retention strength is a powerful 1 t, in addition to which wheel rotation accuracy is kept to within 0.01 µm for a good balance of high accuracy grinding even in heavy-duty cutting. Also, because the wheel spindle has no metal contact, its original performance is maintained semi-permanently.

  • High machining efficiency maintained
    with wide V—Flat guideway
    A widened V—Flat guideway system is used that expands the span between the V and Flat guideways beneath the saddle. Higher workpiece support rigidity enables grinding with full power of 7.5 kW (optional 15 kW). The grinding load on the wheelhead during heavy-duty grinding is supported by wide V—Flat guideway for high machining efficiency.
    High machining efficiency maintained with wide V—Flat guideway
  • Machining time is shortened with high
    speed feed at the top level in the class
    Structure with unrivaled high following characteristics gives high feed speeds of ø30 m/min on the X axis and 20 m/min on the Z axis. Shorter non-cutting times contribute to improved machining efficiency.
    • X-axis feedrate: ø30 m/min
    • Z-axis feedrate: 20 m/min

Machine Specifications

GP14W/GP15W/GA14W/GA15W
Items Unit GP/GA14W GP/GA15W
Distance between centers mm (in.) 250 (9.84)
Swing over table mm (in.) ø330 (ø12.99)
Max grinding dia mm (in.) ø150 (5.91)
Maximum wheel diameter mm (in.) ø405 (ø15.94) ø510 (ø20.8)
Maximum workpiece length mm (in.) 250 (9.84)
Max workpiece weight Center supported kg (lb) 20 (44)
Chuck supported kg × mm
(lb × in.)
10 × 100 (22 × 3.94)
Wheel Wheel size mm (in.) ø405 × ø127 (ø15.94 × ø5.00) ø510 × ø203.2 (ø20.08 × ø8.00)
Max width mm (in.) 75 (2.95)
Grinding wheel speed m/min (fpm) 2,700 [3,600] (8,859 [11,812])
Wheelhead (X-axis) Travel mm (in.) 325 (12.8)
Automatic cutting speed mm/min
(ipm)
ø0.0012 to ø6,000 (ø0.00004 to ø236.22)
Positioning speed m/min (fpm) ø30 (ø98)
Min command increment mm (in.) ø0.0001 (ø0.000004)
Saddle (Z-axis) Travel mm (in.) GP: 395 (15.55) GA: 440 (17.32)
Automatic cutting speed mm/min
(ipm)
0.0006 to 6,000 (0.00002 to 236.22)
Positioning speed mm/min
(ipm)
20,000 (787.40)
Min command increment mm (in.) 0.0001 (0.000004)
Workhead Tapered bore MT No.3 [Dead center workhead, Dead/live headstock]
MT No.4 [Chucking headstock]
Speed min-1 Max 1,000
No. of speed steps Infinitely variable
Tailstock Tapered bore MT.No.3
Working travel mm (in.) 35 [50] (1.38 [1.97])
Manual taper offset mm (in.) ±ø0.08 (±ø0.003)
Motors Grinding wheel axis kW (hp) 5.5 [7.5] (7.5 [10])
For headstock (C axis) kW (hp) 1.7 (2.27)
For wheelhead (X axis) kW (hp) 2.2 (3)
For saddle (Z axis) kW (hp) 2.2 (3)
For coolant pump kW (hp) 50Hz: 0.39 (0.52) 60Hz: 0.62 (0.83)
Hydralic oil-lube pump kW (hp) 1.5 (2.0)
For wheel spindle lubricating oil kW (hp) 0.075 (0.1)
For slideway lubricating oil kW (hp) 0.017 (0.02)
Tank capacity Coolant tank L (gal) 200 (52.8)
Hydralic oil-lube tank L (gal) 20 (5.28)
Wheel spindle lube tank L (gal) 14 (3.7)
Slideway lubricant tank L (gal) 4.2 (1.1)
Weight kg (lb) 4,000 (8,800)
CNC OSP-P300GA

[ ]: Optional

GP25W/GP26W/GA25W/GA26W
Items Unit GP/GA25W GP/GA26W
GP/GA25W × 40 GP/GA25W × 65 GP/GA26W × 40 GP/GA26W × 65
Distance between centers mm (in.) 400 (15.75) 650 (25.59) 400 (15.75) 650 (25.59)
Swing over table mm (in.) ø330 (ø12.99)
Max grinding dia mm (in.) ø200 (ø7.87)
Max workpiece weight Center supported kg (lb) 50 (110)
Chuck supported kg × mm
(lb × in.)
40 × 200 (88 × 7.87)
Wheel Wheel size mm (in.) ø510 × ø203.2 (ø20.08 × ø8) ø610 × ø254 (ø24.02 × ø10)
Width mm (in.) 75 (2.95) (GP: 150 (5.91) GA: 125 (4.92))
No. of speed ranges Infinitely variable
Max grinding speed m/min (fpm) 2,700 (8,858.7)
Wheelhead (X-axis) Travel mm (in.) 420 (16.54)
Automatic cutting speed mm/min
(ipm)
ø0.0012 to ø6,000 (ø0.0000472 to ø236.2)
Rapid traverse m/min (fpm) ø30 (ø98.4)
Min command increment mm (in.) ø0.0001 (ø0.000004)
Saddle (Z-axis) Travel mm (in.) GP : 515 (20.28) /
GA : 650 (25.59)
GP : 815 (32.09) /
GA : 950 (37.40)
GP : 515 (20.28) /
GA : 650 (25.59)
GP : 815 (32.09) /
GA : 950 (37.40)
Automatic cutting speed mm/min
(ipm)
0.0006 to 6,000 (ø0.0000236 to ø236.2)
Rapid traverse m/min (fpm) 20 (65.6)
Min command increment mm (in.) 0.0001 (0.000004)
Workhead Tapered bore MT No.4 [Dead center workhead, Dead/live headstock]
MT No.5 [Chucking headstock]
Speed min-1 650
No. of speed steps Infinitely variable
Tailstock Tapered bore MT No.4
Auto travel mm (in.) 50 (1.97) [80 (3.15)]
Manual taper offset mm (in.) ±ø0.08 (ø0.003)
Motors Wheel spindle kW (hp) 7.5 (10) [15, 22 (20, 30)]
Workhead kW (hp) 2.2 (3)
Wheelhead feed kW (hp) 2.2 (3)
Saddle feed kW (hp) 2.2 (3)
Coolant pump kW (hp) 1.1 (1.5)
Hydralic oil-lube pump kW (hp) 1.5 (2)
Wheel spindle lube pump kW (hp) 0.075 (0.1)
Slideway lubricant pump kW (hp) 0.017 (0.02)
Tank capacity Coolant tank L (gal) 200 (52.84) [300 (79.26)]
Hydralic oil-lube tank L (gal) 20 (5.28)
Wheel spindle lube tank L (gal) 20 (5.28)
Slideway lubricant tank L (gal) 4.2 (1.1)
Weight kg (lb) 5,800 (12,760) 6,300 (13,860) 5,800 (12,760) 6,300 (13,860)
CNC OSP-P300GA

[ ] : Optional