New Makino a51nx and a61nx HMCs Extend Machining Capabilities

New a51nx and a61nx horizontal machining centers offer larger work envelope and next-generation productivity, accuracy and reliability.

Makino’s new a51nx and a61nx horizontal machining centers extend the capabilities of the highly successful a-series with a host of technologies for next-generation productivity, accuracy and reliability. Designed with larger work envelopes, improved casting designs and spindle and axis guide enhancements, the nx machines offer rigidity, speed and precision far beyond that of typical 40-taper machines.

The a51nx and a61nx models boast expanded axis travels to accommodate larger parts or more parts per fixture. The a51nx features a 560-mm (22.0-inch) X-axis and extended Y- and Z-axes of 640 mm (25.2 inches) for an industry-leading total axis volume of 8.1 cubic feet. Its additional Y stroke yields a 14 percent larger working envelope.

The standard a61nx features a 730 mm (28.7 inches) X-axis, 650 mm (25.6 inches) Y-axis and extended Z-axis of 800 mm (31.5 inches). An optional tall column on the a61nx expands the Y-axis to 730 mm (28.7 inches), making it beneficial for large die-cast or near-net-shape applications. Thanks to the expanded Z-axis stroke, maximum tool length on the a51nx and a61nx models is increased to 430 mm (16.9 inches) and 510 mm (20.1 inches), respectively.

Increased Spindle Power
The a51nx and a61nx machines offer new, more powerful standard and optional spindles. The standard spindle is a 14,000-rpm design with 240 Nm of duty-rated torque and 22 kW of continuous output, a 19 percent increase over the previous model. An optional 300-Nm spindle designed for high metal-removal rates in ferrous applications is also available. Along with the two new spindles, the current 20,000-rpm core-cooled spindle remains available as an option on the a51nx and a61nx machines.

Higher Machine Strength and Rigidity
Casting design and axis guide improvements of the nx machines deliver higher stiffness, load capacities and precision. A new crossed roller guide design yields improved rigidity for higher metal-removal rates, reduced vibration and improved tool life.

Several major casting enhancements coupled with the use of cross roller guides enable customers to effectively use the additional 14 percent Y-stroke.

Improved Productivity
The nx machines are designed with a 1G-axis acceleration supplemented by high-power servo motors and enhanced casting rigidity for faster acceleration.

Additionally, nx models have a standard Direct Drive (DD) motor B-axis table for dramatically faster indexing time over the previous worm-gear-driven NC rotary table (NCRT). The motor includes an inertia control system that adjusts table speed and acceleration based on pallet payload. Due to the speed of the DD motor, may lead to fewer machines required in high-volume, high-tool-count automotive applications. The DD motor table also reduces B-axis complexity and eliminates backlash and key component wear.

Expanding Reliability
Makino’s a-series machines have a reputation for reliability as well as low maintenance. The nx machines leverage this proven design to advance reliability with new features.  

The ATC shutter door typically sees millions of cycles over the life span of a machine. On nx machines, a high-speed servo-driven ball screw actuates the ATC shutter door, improving responsiveness, ease of setup and maintenance. The servo axis also reduces exposure of the ATC to the work envelope. The net result is improved reliability and cleaner ATC environments.
About Makino
A world leader in advanced CNC machining centers, Makino provides a wide range of high-precision metal-cutting and EDM machinery, including horizontal machining centers, vertical machining centers, 5-axis machining centers, graphite machining centers, and wire and Ram EDMs. Our flexible automation solutions provide reduced labor costs and increased throughput in a variety of production volumes and designs. With Makino engineering services, we offer industry leading expertise for even the most challenging applications across all industries. For more information call 1.800.552.3288, or visit

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