Kern Micro HD

The Kern Micro HD is the flagship ultra-precision 5-axis machining center from Kern Microtechnik, a German builder that has spent decades perfecting micromachining for medical, watchmaking, and optical applications. With travels of 500 x 500 x 300 mm and positioning accuracy below 1 micrometer, this machine occupies a very specific niche: shops that need mold-quality surface finishes and single-digit micron tolerances straight off the spindle, no polishing required. If you are cutting hardened steel mold inserts, titanium implants, or tungsten carbide watch components, the Micro HD is built for exactly that work.

Kern equips the Micro HD with an HSK-E40 motorized spindle rated up to 50,000 RPM, designed for the small-diameter cutters (down to 0.1 mm) that micro-finishing demands. The hydrostatic guideway system on all linear axes eliminates stick-slip entirely, which is what enables the sub-micron positioning that Kern is known for. Temperature management is comprehensive: spindle, machine base, linear drives, and even the cutting fluid are all independently temperature-controlled to maintain thermal stability during long unattended cycles.

The 5-axis configuration uses a trunnion-style rotary table with direct-drive torque motors on both the A and C axes. The table accepts workpieces up to 300 mm diameter and 200 mm height, with pallet automation available through Kern's integrated handling system. For shops running lights-out, the machine can be configured with a tool magazine holding up to 209 tools, meaning complex multi-operation jobs run without intervention.

Kern builds the Micro HD on a polymer concrete (mineral cast) machine base that provides roughly 6-10x better vibration damping than cast iron. Combined with the hydrostatic guides and thermal management, this foundation is what allows the machine to hold tolerances that most shops would associate with grinding or EDM rather than milling. Surface finishes of Ra 0.05 um are achievable on hardened steel, which eliminates secondary finishing operations on precision mold and die work.