The DMG Sauer Ultrasonic 20 Linear is a compact 5-axis vertical machining center built for the one thing conventional mills struggle with: hard-brittle advanced materials. Ultrasonic-assisted machining superimposes high-frequency axial oscillation on the cutting tool, so technical ceramics, glass, sapphire, quartz, solid carbide, and fiber-reinforced composites are removed cleanly instead of fracturing at the cut edge. The machine carries travels of 8.7 in X by 14.6 in Y by 11.4 in Z, and a 42,000 RPM spindle running the HSK-E40 interface that carries the ultrasonic actuator. Full simultaneous 5-axis motion comes from an integrated swivel rotary table with an A-axis swivel range of +130 deg to -93 deg and a C-axis turning at 150 RPM, which lets contoured and undercut geometry finish in a single setup rather than across multiple fixtures. A 24-station automatic tool changer supports unattended cycles across roughing, finishing, and ultrasonic grinding operations. The work zone accepts parts up to 11.9 in long by 8.7 in wide by 11.1 in high at up to 33.1 lbs, sized for optics, semiconductor, medical, aerospace, and precision-component work. This unit includes a chiller, a coolant recycler, and a mist recycler.
Against the earlier non-linear Sauer Ultrasonic 20, which drove its axes through conventional ball screws, the Ultrasonic 20 Linear is a different class of machine. Linear-motor direct drives replace the ball-screw stacks on the linear axes, eliminating the backlash, wind-up, and wear-driven drift that limited how long the older machine held a tolerance band, and delivering the acceleration and following accuracy that ultrasonic grinding of brittle materials demands. The direct-drive design removes rotating mechanical elements from the feed path, so positioning repeatability stays consistent over long cycles instead of degrading as screws and nuts wear. Paired with the 42,000 RPM HSK-E40 ultrasonic spindle and the full simultaneous 5-axis swivel rotary table, that drive architecture turns the Ultrasonic 20 Linear into a machine capable of finishing sapphire windows, ceramic insulators, and carbide tooling to optical-grade surfaces in one setup - work the ball-screw generation could complete but not hold as tightly or as long. For a shop moving into advanced materials, this is a meaningfully better machine, not simply a newer one.