USED OKUMA GP/GA-47FII

The Okuma GP/GA-47FII is a large-capacity CNC cylindrical grinding machine designed for precision external grinding of medium-to-large and long shaft-type components. As the largest model in Okuma’s GP/GA-FII series, it is engineered to deliver high rigidity, accuracy, and flexibility for demanding applications across industries such as automotive, aerospace, energy, and heavy engineering. The machine is available in both plain head (GP) and angle head (GA) configurations, allowing it to handle a wide range of grinding operations including straight, tapered, and complex form grinding.

The GP/GA-47FII supports a maximum grinding diameter of approximately 400 mm and offers multiple distance-between-centers configurations ranging from 350 mm up to 1,500 mm, making it ideal for long shafts and multi-journal components. It utilizes a large grinding wheel of around 760 mm diameter with a spindle motor rated at approximately 15 kW (optional higher power), providing excellent stability and material removal capability.

A key feature of the machine is its hydrodynamic wheel spindle, which ensures high rotational accuracy and minimal vibration during grinding. Combined with wide V-flat guideways, this design enhances rigidity and maintains consistent dimensional accuracy even during long grinding cycles.

The machine is equipped with Okuma’s OSP-P300GA control system, featuring IGAP+ conversational programming that simplifies setup and operation. It supports a wide range of grinding processes including plunge, traverse, multi-plunge, taper, and form grinding.

With rapid traverse speeds of approximately 16 m/min, the GP/GA-47FII is optimized to reduce non-productive time and maximize grinding (cutting) time utilization. Overall, it provides a powerful combination of size, precision, and productivity, making it a top-tier solution for large-part cylindrical grinding applications.

OKUMA GP/GA-47FII SPECIFICATIONS

WHY BUY USED OKUMA GP/GA-47FII

Buying a used Okuma GP/GA-47FII is a strategic investment for manufacturers requiring large-capacity cylindrical grinding without the high cost of a new machine. Machines in this category are built with heavy-duty construction and precision engineering, allowing them to maintain performance and accuracy over long operational periods when properly maintained.

One of the biggest advantages of purchasing used is cost efficiency. Large CNC cylindrical grinders like the GP/GA-47FII require significant capital investment when new. A used machine allows businesses to access the same high-capacity grinding capability, long-bed configuration, and advanced control systems at a fraction of the original price, improving overall return on investment.

Grinding time (spindle hours) is one of the most critical factors when evaluating a used unit. Machines with lower grinding hours generally retain better spindle condition and guideway accuracy. For example, a machine from the early 2010s with moderate grinding time may provide more reliable long-term performance than a newer machine that has been heavily used in continuous production. Since this model is commonly used for long shaft grinding, wear on guideways, tailstock, and steady-rest areas should be carefully inspected.

Another advantage is process flexibility. The GP/GA-47FII can handle a wide range of grinding operations—including plunge, traverse, taper, and complex form grinding—within a single setup. Even in used condition, this capability can significantly improve workflow efficiency by reducing setups and handling time.

Additionally, Okuma’s strong support network and parts availability reduce the risks associated with purchasing older equipment. From a financial perspective, buying used allows for faster payback, as lower upfront costs combined with high grinding time utilization enable the machine to quickly contribute to production output and profitability.

HOW MUCH DOES A USED OKUMA GP/GA-47FII COST?

The cost of a used Okuma GP/GA-47FII varies based on factors such as manufacturing year, configuration, condition, and most importantly, grinding time (spindle hours). As the largest model in the GP/GA-FII series, it typically commands higher prices than smaller cylindrical grinders due to its capacity and capability.

Machines built before 2000 (or earlier-generation grinders comparable to this platform) generally range from $20,000 to $50,000. These machines are the most affordable but may include outdated controls and higher wear levels. Grinding time is especially important—machines with high spindle hours may require reconditioning, while low-hour units can still be viable for lighter production applications.

Models produced between 2000 and 2010 typically range from $50,000 to $120,000. This segment often provides the best balance between price and performance, offering improved controls, better spindle technology, and enhanced rigidity. Units with low to moderate grinding time are particularly desirable, as they can deliver reliable accuracy with manageable maintenance costs.

Machines from 2010 to 2025 generally range from $120,000 to $280,000 or more, depending on configuration, automation integration, and control upgrades. These newer machines benefit from advanced CNC systems, improved efficiency, and better consistency during long production runs.

Grinding time remains the most critical pricing factor. A newer machine with excessive spindle hours may be less valuable than an older unit with minimal use. Buyers should carefully evaluate spindle condition, guideway wear, and maintenance history to determine true market value and ensure long-term operational reliability.