Advanced Servo Motors Drive the Next Generation of 3D Metal Printing

The fusion of cutting‑edge servo motor designs, highly adaptable robots, and a suite of advanced technologies is propelling a new wave of fabrication methods in modern manufacturing. At the heart of this evolution are servo motors and robots, which are reshaping how prototypes, parts, and finished products are created.

Two complementary approaches—additive manufacturing (AM) and subtractive manufacturing—have become the bedrock of this transformation. AM, commonly known as 3D printing, uses digital design data to build solid, three‑dimensional objects layer by layer from the bottom up, often producing near‑net‑shape (NNS) parts with zero waste.

Industries such as automotive, aerospace, energy, medical, transportation, and consumer goods increasingly rely on AM for both simple and complex product designs. In contrast, subtractive manufacturing removes material from a solid block using high‑precision cutting or machining to create a 3‑D product.

While they differ fundamentally, additive and subtractive processes are rarely mutually exclusive. A prototype may first be produced by AM, then refined or mass‑produced with subtractive techniques. Hybrid workflows are now common in time‑sensitive applications—repairing worn parts or delivering quality components with minimal lead time.

For 3D metal printing, dimensional precision and surface finish are paramount, which is why end‑users increasingly favor 3D printers equipped with servo systems instead of stepper motors. Servo motors provide superior motion control, eliminating the torque ripple and stepped lines that can mar a part’s finish.

Motion‑control specialist YASKAWA has engineered a line of servo motors that includes the SIGMA‑7 series. These robust units incorporate vibration‑suppression filters, anti‑resonance, and notch filters to deliver ultra‑smooth motion that removes the visually unappealing stepped lines caused by stepper motor torque ripple.

In addition, the latest speed enhancements allow print speeds of up to 350 mm s⁻¹—more than double the average speed of a stepper‑motor‑driven printer. Rotary systems can reach travel speeds of up to 1,500 mm s⁻¹, while linear servo technology can move at 5 m s⁻¹. This rapid acceleration enables print heads to settle into their target positions almost instantly, eliminating the need to slow down the entire system and allowing manufacturers to produce more parts per hour without compromising quality.

Servo systems also offer automatic, user‑driven tuning. Operators can perform custom tuning to adapt to changes in the printer’s mechanics or process variations—something impossible with stepper motors, which lack position feedback.

Furthermore, absolute encoder feedback means the printer only needs to perform a homing routine once, boosting uptime and cutting operating costs. Stepper‑motor systems, by contrast, must be homed every time they are powered on.

Feedback sensing built into servo systems also monitors the extruder, catching bottlenecks or jams before they ruin an entire batch.

With more than 22 million servo systems already deployed worldwide, YASKAWA’s deep expertise in motion and control translates into outstanding performance and reliability.

For further details, contact Paul Seale at paul.seale@yaskawa.eu.com or call +44 (0) 1295 2727 5575. Visit YASKAWA Europe.