[en] Material processing with electron beams has become an inevitable technique in this rapidly expanding technological world. Almost all the developed and developing nations have indigenized this technology to cater the requirement of their nuclear, defense and aeronautical industries. In India, BARC has been the hub of indigenous EB machines over the past four decades. The EB welding and melting machines developed at BARC have been successfully deployed in various DAE as well as other units. The indigenous EB machine development programme at BARC has now attained technological competence, squarely resting on knowledge base, user base and vendor base. This talk mainly highlights on the different facets of indigenous electron beam machines, especially the technological challenges during the course of development