High aspect ratio and complex shaped blind micro holes by micro EDM

Z. Y. Yu, K. P. Rajurkar, H. Shen

Research output: Contribution to journalArticlepeer-review

144 Scopus citations


It is difficult to drill high aspect ratio through holes and complex shaped blind holes using micro EDM. The debris concentration in the narrow discharge gap causes abnormal discharges leading to excessive electrode wear and lower machining precision. In micro EDM, the electrode size is too small for internal flushing. This paper presents a new approach for effective self-flushing using planetary movement. Through micro holes with an aspect ratio of 18 have been drilled. This approach is also demonstrated by drilling blind noncircular micro holes with sharp corners and edges. The process performance characteristics are analyzed under different machining conditions.

Original languageEnglish (US)
Pages (from-to)359-362
Number of pages4
JournalCIRP Annals - Manufacturing Technology
Issue number1
StatePublished - 2002


  • EDM
  • Micro-machining
  • Performance

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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