The G7 i Grinder 5-axis horizontal machining center is a flexible, single-platform solution for grinding, drilling and milling of aerospace blades, vanes, turbine disks and other complex grinding applications.

Reducing Setups, and Equipment, for Aerospace Grinding

Sept. 6, 2012
Multifunctional configuration and five-axis capability 12,000-rpm spindle for tough-to-cut materials X (690 mm), Y (650 mm) and Z (730 mm) axis travels

Makino is making a case for simplicity in machine design. The new G7 i Grinder five-axis horizontal machining center it is offering now is described as a “flexible, single-platform solution” that performs grinding, drilling, and milling for aerospace blades, vanes, turbine disks, and other complex grinding applications. The G7’s multifunctional configuration and five-axis capabilities makes it possible for producers of aerospace parts and components to eliminate complex setups, work-in-process, stack-up errors, and fixture costs. It also simplifies the manufacturing process with NC-controlled intermittent dress.

With its selection of advanced CNC machining centers, Makino states it is committed to providing high-performance, leading-edge machining technologies and innovative engineered process solutions: its products include machines for high-precision metal-cutting and EDM, including horizontal machining centers.

“Today’s capital equipment must be more flexible and capable than ever, removing non-value-added time from the manufacturing process,” noted David Ward, horizontal product line manager at Makino. “With the G7’s capability to combine milling and grinding operations, you’re not only saving on capital equipment, but you’re also eliminating multiple set-up operations and work in progress times that add to your costs and lead-time.”

Similar to Makino’s G5 five-axis horizontal machining center, the G7 employs a 12,000-rpm HSK-63A spindle capable of handling tough-to-cut materials —Inconel, for example.  The machine provides X-, Y- and Z-axis travels of 690, 650, and 730 mm, respectively, accommodating workpieces with a maximum diameter of 535 mm. This functionality makes it possible to machine parts one size larger than the G5, such as super-heat-resistant jet engine parts, curvic couplings, and vanes (NGV).

The G7’s infinite C-axis rotation and maximum 270° B-axis rotation give full access for producing three-dimensional parts for single-setup production capabilities.

Of particular note is the G7’s two-axis Programmable Coolant Nozzle (PCN) that accommodates variations in wheel diameter and changes in cutting direction while maintaining ideal coolant flushing conditions. It also allows for intermittent rotary dressing, an NC-controlled, electrically powered feature that trues the wheel to reestablish profile geometry on the cutting wheel. Combined use with the standard 60-tool capacity automatic tool changer makes it possible for the shop to maintain continuous operation to maximize throughput.

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