Four-axis and rotary CNC control: compare A18, B18 and B58

The four-axis label alone does not make controllers interchangeable; signal and workflow still matter.

A18, B18 and B58 are retained for four-axis or rotary applications. Compare their series, signal options and operator workflow rather than assuming every four-axis controller is a direct replacement.

Verify the rotary mechanism, driver signal, cabinet I/O and intended workflow before choosing a replacement or a new control package.