ONA AF3

The ONA AF3 is a compact, high-precision CNC sinker EDM from ONA Electroerosion's AF series, designed for tool rooms, precision subcontractors, and mold shops that require professional sinker EDM capability in a space-efficient footprint. The AF3 addresses the segment between entry-level manual EDM and fully automated production sinker EDM, offering digital generator control, programmable CNC operation, and respectable surface finish performance at a price point accessible to small and mid-size precision manufacturing operations.

The AF3 is built around ONA's digital P-SERIES generator in a configuration matched to the machine's compact electrode capacity and work tank dimensions. The generator manages pulse discharge with microsecond resolution, adapting spark conditions to maintain stable erosion across varying cavity shapes and electrode sizes. The result is consistent material removal rates, predictable cycle times, and surface finishes down to Ra 0.4 µm in finishing mode — sufficient for the majority of punch, die, and mold insert applications that represent the AF3's primary market.

Despite its compact dimensions, the AF3 does not sacrifice rigidity. The cast iron machine base is thermally stabilized and provides the structural stiffness needed for accurate electrode positioning throughout extended erosion cycles. The Z-axis servo ram uses a high-resolution encoder to maintain precise gap control, and the machine's thermal management design minimizes positional drift during long production runs. These attributes make the AF3 suitable for precision work that demands dimensional repeatability across multiple parts or electrode changes.

The ONA-CNC control system on the AF3 provides a clear operator interface with ONA's technology database for guided parameter selection, manual and ISO program entry, and communication ports for DNC and network integration. The AF3's relatively straightforward setup and operation make it a practical choice for shops introducing sinker EDM for the first time, while its generator sophistication gives experienced operators access to fine-finish and no-wear machining modes that distinguish ONA's product line. Automatic electrode changer options extend the AF3's unattended production capability for repeat cavity work.

The ONA AF3 competes directly with entry-to-mid sinker EDM offerings from Mitsubishi Electric and Sodick, and its European manufacturing heritage brings advantages in fit and finish, ergonomics, and direct technical support through ONA's European distributor network. For North American and Asian shops, authorized ONA distributors provide installation, training, and ongoing application engineering support.