Abstract
The electron beam is a very versatile tool for machining of matter and is used for welding, drilling, engraving, melting and evaporation. The high machining speeds, the desired accuracy and the number of controlled conditions (work-piece movement, beam deflection, axial position of the beam focus, beam current) require a computer supervised numerical control (CNC) with a throughput of data, which is hundred to thousand times faster than that of conventional CNCs for mechanical machines. The paper describes a CNC developed for controlling the electron beam machine of the Vienna University of Technology. The CNC is devised as a hierarchy. A minicomputer provides the data for controlling the global process and the low speed data. Fast hardwired units generate and process the index values on line within one microsecond along straight lines or circular lines (welding joints or traces to be engraved).
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