NHP Series

The NHP Series is a high productivity machining center that offers high productivity and ultimate precision with minimized non-cutting time, stable machine structure and thermal distortion correction function. The NHP 4000 delivers with automatic tool changes in under a second and 15,000 RPM spindle with axes acceleration of up to 1G, thru-spindle and flood coolant, center-thru chip evacuation, highly precise linear guides, larger work area, and a smaller footprint.

Engineered for Rigidity and Precision

The NHP 6300 horizontal machining center is built on a foundation optimized for superior performance and long-term reliability. Constructed with a massive, one-piece Meehanite cast iron bed featuring a double wall design, the machine ensures excellent dampening and vibration absorption, critical characteristics for heavy-duty cutting. The machine utilizes Linear Roller Motion Guides (53 mm / 2.086") on all axes, which are three times more rigid and offer twice the life compared to ball bearing guide ways, ensuring optimal weight and force distribution. Furthermore, large diameter (50 mm / 1.97") and pre-tensioned ball screws are directly connected to the servo motors, eliminating backlash. To maintain accuracy during extended cycles, the design incorporates ball nut cooling, which minimizes the effects of thermal growth. This structural stability supports maximum part dimensions of 1,050 mm (41.3") in diameter and 1,350 mm (53.1") in height on a 630 mm x 630 mm pallet, accommodating loads up to 1,500 kg (3,306 lbs).

High-Torque Spindle Performance

The NHP 6300 delivers powerful, dual-purpose machining capability, combining heavy-duty cutting with high-speed performance. At its core is a high-performance, built-in spindle system engineered to minimize thermal growth and vibration. This system features a powerful 25 / 37 kW (34 / 50 hp) AC motor with a maximum speed of 10,000 rpm. Leveraging a dual motor winding system that creates a two-step “virtual gearbox,” the machine achieves exceptional low-end power, generating 420 Nm (310 ft-lbs) of torque in the low spindle range for aggressive roughing cuts. The machine incorporates the CAT 50 Big Plus Spindle system, which utilizes simultaneous taper and flange contact between the machine spindle and tool holder for superior rigidity, surpassing standard spindle concepts. Additionally, the spindle features rigid tapping and rapid acceleration, achieving 0 to 10,000 rpm in just 3.4 seconds.

Optimized Production Throughput

Productivity in the NHP 6300 is maximized by significantly minimizing non-cutting time through highly efficient motion and tooling systems. The machine boasts identical rapid traverse rates across the X, Y, and Z axes at a swift 60 m/min (2,362 ipm). Complementing this speed is the efficient tooling system: the standard 90-tool chain-type Automatic Tool Changer (ATC) achieves a rapid tool-to-tool change time of only 2.5 seconds (for tools under 12 kg / 26.5 lbs). The ATC supports tools up to 630 mm (24.8") in length and 320 mm (12.6") in diameter (when adjacent pockets are empty). Further enhancing uptime, the standard rotary shuttle Automatic Pallet Changer (APC) has a change time of 12 seconds. This APC allows the operator to manually rotate and lock the pallet in the setup station every 90 degrees while the machine is running, aiding in fixture or part changeover for maximum operational efficiency.

Integrated Control and Monitoring Features

The NHP 6300 comes standard with advanced technological features to ensure process control and safety. Utilizing the Fanuc 31i-B Control with AICC II 600 block look ahead, the machine is designed for seamless operation. Crucial for process optimization, the Adaptive Feedrate Control (AFC) monitors spindle load and adjusts the programmed feedrate dynamically—increasing it during air cutting or decreasing it during heavy cuts—to minimize wasted cycle time and prevent tool breakage. The standard Tool Load Monitoring System (TLM) continually checks the load on all axes and the spindle, allowing operators to set limits for wear and breakage conditions for each tool, which triggers an alarm and stops operation if exceeded. Furthermore, the machine is equipped with Through Spindle Coolant (TSC) (providing approximately 215-225 psi pressure directly at the tool tip) and is Renishaw probe ready (including the RMI-Q radio receiver and GUI software).

FAQ Section

What type of cutting environments is the NHP 6300 designed for?

The NHP 6300 is designed for a combination of heavy-duty cutting and high-speed machining, along with high precision over a wide range of applications. It is engineered to maximize productivity with faster speeds and enhanced precision, making it ideal for demanding applications.

How does the NHP 6300 achieve high torque at low RPMs for roughing operations?

The machine utilizes a powerful built-in spindle motor with a dual-wound, "virtual gearbox" design. This system allows for two virtual gear ranges and generates 420 Nm (310 ft-lbs) of torque in the low spindle range, providing excellent performance for heavy roughing cuts.

What features ensure the stability and accuracy of the machine structure?

The stability is ensured by the use of a rigid, one-piece casting made from fine grain Meehanite cast iron, which is heavily ribbed to withstand deformation under heavy cutting loads. All axes employ Linear Roller Motion Guides (53 mm / 2.086"), which are heavy-duty and widely spaced for optimal rigidity and force distribution. Additionally, the spindle uses a CAT 50 Big Plus system, which achieves maximum rigidity through simultaneous taper and flange contact.

Can the NHP 6300 accommodate large fixtures or tombstones?

Yes, the machine's table area (630 mm x 630 mm) can accommodate a maximum part size of 1,050 mm (41.3") in diameter and 1,350 mm (53.1") in height (when no hydraulic interface is present). The machine also includes qualified edge locators to aid in setting up fixtures or tombstones.

What control systems are in place to prevent tool damage and optimize cutting time?

The NHP 6300 includes two key systems: the Adaptive Feedrate Control (AFC) and the Tool Load Monitoring System (TLM). AFC adjusts the programmed feedrate based on the monitored spindle load, compensating for severe axis overload or detecting air cutting. The TLM continually checks the load on the axes and spindle motors, allowing operators to set limits for wear and breakage conditions, which triggers an alarm and stops operation if abnormal loads are detected.