The GF Machining Solutions Mikron MILL X 400 U is a high-speed 5-axis vertical machining center with a reputation for precision and stability that has made it a staple in mold, medical, watch, and precision component shops. This 2018 machine carries X 19.68 / Y 9.45 / Z 14.17 inch travels and a System 3R Macro Magnum rotary tilt table with B-axis swivel of +/-110 degrees and continuous C-axis rotation, handling workpieces up to 9.06 inches in diameter and 13.79 inches tall at up to 55 lbs. The Step-Tec motor spindle is rated at 42,000 RPM with HSK-E40 tooling, 13.5 kW (18 HP) at 40 percent duty and 8.8 Nm of torque, fed by a 68-position HSK-E40 tool magazine with a 4 second tool change and 5.5 second chip-to-chip time. Linear motors and high-resolution glass scales on all axes deliver 100 m/min (3,937 ipm) feed rates and 15 m/s2 acceleration on a polymer concrete portal base, with OEM-rated positioning tolerance of 4 microns and repeatability of 2.4 microns. Automation comes from a 27-station System 3R Macro pallet changer for unattended runs. Control is a Heidenhain iTNC 530 HSCI with conversational and DIN/ISO programming, Ethernet, and USB. Factory options include Extended 5-axis Accuracy, Ambient Robust and ITC-5X thermal control, APS Advanced Process System, Kinematics Opt, power fail protection, production monitoring software, a Knoll lift-up scraper conveyor with 0.1 mm filtration, chip auger, 650 L band filter, oil skimmer, oil mist spray, and spindle nose and work area washdown.
The MILL X 400 U succeeds Mikron's HSM 400U LP and moves the platform forward in the areas that matter most for high-speed 5-axis work. Where the HSM 400U LP ran on Heidenhain TNC 430M or first-generation iTNC 530 controls, the MILL X 400 U is built around direct linear motor drives on every linear axis, with feed rates of 100 m/min and 15 m/s2 acceleration and no mechanical drive train to wear or develop backlash. The digital Heidenhain iTNC 530 HSCI architecture links the control, drives, and encoders over a real-time serial interface for faster block processing and cleaner surface finishes, and the integrated rotary tilt table uses liquid-cooled torque motors on both rotary axes. For a buyer, that means a meaningfully faster, stiffer, and more accurate machine than the HSM generation it replaced, built to hold micron-level geometry through long, lights-out pallet runs.