Makino a51nx and a61nx HMCs Extend Machining Capabilities

Designedwith larger work envelopes, improved casting designs and spindle and axis guideenhancements, the nx machines offer rigidity, speed and precision far beyond thatof typical 40-taper machines.

Thea51nx and a61nx models boast expanded axistravels to accommodate larger parts or more parts per fixture. The a51nxfeatures a 560-mm (22.0-inch) X-axis and extended Y- and Z-axes of 640 mm (25.2inches) for an industry-leading total axis volume of 8.1 cubic feet. Itsadditional Y stroke yields a 14 percent larger working envelope.

Thestandard 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 onthe a61nx expands the Y-axis to 730 mm (28.7 inches), making it beneficial forlarge die-cast or near-net-shape applications. Thanks to the expanded Z-axisstroke, maximum tool length on the a51nx and a61nx models is increased to 430mm (16.9 inches) and 510 mm (20.1 inches).

Thea51nx and a61nx machines offer new, morepowerful standard and optional spindles. The standard spindle is a 14,000-rpmdesign with 240 Nm of duty-rated torque and 22 kW of continuous output, a 19percent increase over the previous model. An optional 300-Nm spindle designedfor high metal-removal rates in ferrous applications is also available. Alongwith the two new spindles, the current 20,000-rpm core-cooled spindle remainsavailable as an option on the a51nx and a61nx machines.

Castingdesign and axis guide improvements of the nx machines deliver higher stiffness,load capacities and precision. A new crossed roller guide design yields improvedrigidity for higher metal-removal rates, reduced vibration and improved toollife.

Severalmajor casting enhancements coupled with the use of cross roller guides enablecustomers to effectively use the additional 14 percent Y-stroke.

Thenx machines are designed with a 1G-axis acceleration supplemented by high-powerservo 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 previousworm-gear-driven NC rotary table (NCRT). The motor includes an inertia controlsystem that adjusts table speed and acceleration based on pallet payload. Dueto 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-axiscomplexity and eliminates backlash and key component wear.

TheATC shutter door typically sees millions of cycles over the life span of amachine. On nx machines, a high-speed servo-driven ball screw actuates the ATCshutter door, improving responsiveness, ease of setup and maintenance. Theservo axis also reduces exposure of the ATC to the work envelope. The netresult is improved reliability and cleaner ATC environments.

Makino a51nx and a61nx HMCs Extend Machining Capabilities_A

Makino a51nx and a61nx HMCs Extend Machining Capabilities_A