Abstract
This study deals with the investigation of the possibility to fabricate an arc-shaped hole on the inside wall of another straight hole by means of electrical discharge machining. Although the authors developed a device which can fabricate a hole inside another hole, the shape of the fabricated hole has been limited. Aiming to diversify the hole shape, the study improves the device so that it can fabricate such a hole with an arc-shaped axis. The experimental results indicate that such a hole can be fabricated. It is proven that the improved device has the ability to fabricate an arc-shaped hole inside another straight hole.
