Performance evaluation of orbital EDM along helical path over cavity sinking EDM of Inconel 718

Harshit K. Dave, Harit K. Raval, Keyur P. Desai, Kamlakar P. Rajurkar

Research output: Contribution to journalConference articlepeer-review


During EDM, orbital tool actuation can decouple the size of tool electrode from the size of cavity. In present study, experimental investigation is carried out to study the effect of orbital tool actuation along helical path on material removal rate and Surface roughness. The experimental results have been compared with those under conventional cavity sinking process. A circular hole having 10 mm diameter and 10 mm depth is generated on Inconel 718 using copper electrode. It is observed that orbital tool actuation improves MRR as compared cavity sinking process at machining depth of 10 mm. Further, lower surface roughness is observed with orbital EDM relative to cavity sinking process. The surface characteristics under different machining conditions are reported with the help of SEM images. Thus while machining deep holes, orbital tool actuation along helical path substantially improves MRR and surface finish relative to cavity sinking process under same machining conditions.

Original languageEnglish (US)
Pages (from-to)81-87
Number of pages7
JournalTransactions of the North American Manufacturing Research Institution of SME
Issue numberJanuary
StatePublished - 2014
Event42nd North American Manufacturing Research Conference 2014, NAMRC 2014 - Detroit, United States
Duration: Jun 9 2014Jun 13 2014


  • EDM
  • Inconel 718
  • MRR
  • Surface roughness

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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