In this thesis we have discussed influence of gap flushing and electrode lifting frequency for machining time of tap hole in hardened material while using die sinking EDM . We searched for optimal lifting frequency of electrode, which enables shortest machining time of tap hole with chosen machining parameters. We measured hole made at that frequency with 3D measuring device and found out, that made hole suits our tolerance area, which enables further machining of thread M10-H7. At the end we made suggestions for further research, to make machining time of tap hole, with die sinking EDM, even shorter.
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