Okuma GP-GA-36FII

The Okuma GP-GA-36FII puts a heavy wheel on a mid-size grinder. Maximum grinding diameter is 300 mm (11.81 in), yet the wheel is listed at 610 × 254 mm (24 × 10 in) with a 150 mm (6 in) width, and the wheel spindle motor is 15 kW (20 hp) with 22 kW (30 hp) available as an option.

Set against the GP-GA-34FII, which grinds the same 300 mm with a 455 × 127 mm wheel, a 75 mm (3 in) width and 7.5 kW (10 hp), the wheel is larger and both its width and the standard motor are doubled. In practice that changes how a part is ground. A 150 mm face lets a long bearing seat or a group of adjacent diameters be plunge ground in one infeed where the narrower wheel would traverse, and the larger motor holds wheel speed under that wider contact. The 22 kW option deserves a price if the work is mostly wide plunges in hardened steel, since plunge width is what loads the motor.

The table lists a swivel angle of +/- 6°. That is enough to dial out taper on a long shaft or to grind a shallow taper deliberately, but not steep tapers. Okuma's headline figures say nothing more about the swivel, so confirm what it covers when quoting tapered work.

Rapid traverse is 10 m/min (394 ipm) in X and 15 m/min (591 ipm) in Z, and the control is the Okuma OSP-P300G. Four center distances are offered: 350 / 650 / 1,000 / 1,500 mm (13.78 / 25.60 / 39.4 / 59.05 in). On the shortest bed the wheel width is a large share of the available length, so check shoulder clearance against the part drawing before settling on 350 mm.