Electron beam machining (EBM) is a high-energy beam process invented in 1952 that uses an electron beam to remove material. Electrons are generated and accelerated to high velocities, focusing the beam into a small spot to intensely heat and melt or vaporize material. The process occurs inside a vacuum chamber to prevent electron scattering. Key parameters that control the machining include accelerating voltage, beam current, pulse duration and spot size. EBM can drill small, high aspect ratio holes and cut intricate shapes in a wide range of materials.