Fanuc A20B-8100-0420 Auxiliary Axis Board

The Fanuc A20B-8100-0420 Auxiliary Axis Board is an expansion module that adds a dedicated auxiliary axis interface to Fanuc CNC control systems. Identified by part number A20B-8100-0420, this board is designed to augment axis capacity in compatible Fanuc automation hardware, enabling an extra axis to move in concert with the primary axes. By providing an additional control path for an auxiliary axis, it supports more complex toolpaths and coordinated motion essential for multi‑axis milling, drilling, and turning applications in manufacturing environments that rely on Fanuc controls. The board is installed as a plug‑in option within the existing Fanuc control ecosystem, with functionality and integration details determined by the host controller and surrounding hardware configuration. This makes it suitable for retrofit projects or system upgrades where expanding axis capability is required to meet tighter tolerances or more intricate part geometries. For best results, ensure you are working with a Fanuc controller model and hardware setup that lists support for an auxiliary axis board and consult your control system's documentation for exact compatibility and installation procedures.