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tional view of the workpiece machined by the former electrode in case of wire feed ratio of 4:5. Figure 7(a) and
8 are depicted in an identical scale. From the comparison of them, it is seen that a curved hole with half diameter
can be machined.

CONCLUSIONS

Aiming at size reduction of curvedhole diameter, the device isdeveloped, which can machine acurved hole of about
10mm in diameter. From the motion and machining experiments, the obtained conclusions are summarized as
follows:

(1) The diameter of the electrode is reduced to 10mm, which is a half of the former one, by redesigning the electrode,
the parts constituting the electrode and the peripheral parts of the electrode.

(2) The size reduced electrode and its peripheral parts for the curved hole machining device being well provided,
the electrode can move along a straight and curved trajectory as well as the former electrode.

(3) By means of the curved hole machining device equipped with the redesigned parts, the movement of an EDM
head can be transmitted to the size reduced electrode, which means that electrical discharge machining by the
electrode works well. As a result, it is achieved to create curved holes with an approximately half diameter,
compared with those by the former electrode.

ACKNOWLEDGEMENT
The study is partly supported by the Ministry of Education, Culture, Sports, Science and Technology, Grant-in-
Aid for Young Scientists, (B) 14750083

REFERENCES

Goto A., Watanabe K. and Takeuchi A. (2002). A Method to Machine a Curved Tunnel with EDM.
International Journal of Electrical Machining 7, 43-46.

Ichiyasu S., Takeuchi A. and Watanabe K. (1997). Machining Curved Tunnel for Coolant with Mole EDM.
Proceedings of 4th International Conference on Die & Mould Technology, 224-330.

Ishida T. and Takeuchi Y. (2000). Curved Hole Machining by Means of Electrical Discharge Phenomena and
Electrode Feed Mechanism. Proceedings of the 2000 Japan USA Flexible Automation Conference,
1283-1288.

Ishida T. and Takeuchi Y. (2002). L-shaped Curved Hole Creation by Means of Electrical Discharge
Machining and an Electrode Curved Motion Generator. International Journal of Advanced Manufactur-
ing Technology 19:4, 260-265.
UchiyamaM. and Shibasaki T. (2004). Development ofanElectromachining Method for Machining Curved
Holes. Journal of Materials Processing Technology 149:1, 453-459.