Electric discharge machine for making thin hole

An electrical discharge machine for forming a small hole comprising:

• an electrode holder to hold an electrode for forming a small hole;
• a drive unit to drive the electrode holder and electrode for forming a small hole in the longitudinal direction;
• a small hole guide having a small hole to guide the electrode for forming a small hole, arranged close to a workpiece;
• and an electric power source used for electric discharge machining to supply electric power for electrical discharge machining between the electrode for forming a small hole and the workpiece, wherein a small hole is formed in the workpiece by electric discharge energy,
• the electrical discharge machine for forming a small hole further comprising:
• an intermediate guide having a first guide to support the electrode for forming a small hole at a position close to the small hole guide and also having a second guide to support the electrode for forming a small hole at a position between the electrode holder and the small hole guide, the second guide having a chuck capable of being opened and closed;
• a first drive unit to drive the intermediate guide in the longitudinal direction of the electrode for forming a small hole;
• a second drive unit to open and close the chuck of the second guide of the intermediate guide;
• and
• a third drive unit to variably change a distance between the first and the second guide of the intermediate guide in the longitudinal direction of the electrode for forming a small hole.

An electrical discharge machine for forming a small hole comprising:

• an electrode holder to hold an electrode for forming a small hole;
• a drive unit to drive the electrode holder and electrode for forming a small hole in the longitudinal direction;
• a small hole guide having a small hole to guide the electrode for forming a small hole, arranged close to a workpiece;
• and an electric power source used for electric discharge machining to supply electric power for machining between the electrode for forming a small hole and the workpiece, wherein a small hole is formed in the workpiece by electric discharge energy,
• the electrical discharge machine for forming a small hole further comprising:
• an intermediate guide having a first guide to support the electrode for forming a small hole at a position close to the small hole guide and also having a plurality of guides except for the first guide to support the electrode for forming a small hole at positions between the electrode holder and the small hole guide, the plurality of guides except for the first guide having a chuck capable of being opened and closed;
• a first drive unit to drive the intermediate guide in the longitudinal direction of the electrode for forming a small hole;
• a second drive unit to open and close the chucks of the plurality of guides except for the first guide of the intermediate guide;
• and
• a third drive unit to variably change a distance between the first guide and each of the plurality of guides except for the first guide in the longitudinal direction of the electrode for forming a small hole.