WET ROTATING DRILL APPARATUS

PROBLEM TO BE SOLVED: To perform miniaturization and to improve operatability of a wet rotating drill apparatus in the wet rotating drill apparatus wherein a hole for repairing is made on a wall face, etc., by an extremely simple work by feeding a cooling medium prepd. by mixing low b.p. org. solvents based on liq. as base materials from an aerosol can. SOLUTION: A rotating shaft 7 being freely rotatably mounted in a shaft hole 16 with a step in a housing 6 is supported in such a way that a shaft part 7a with a narrow diameter and a shaft part with a wide diameter are respectively supported by a small-sized bearing 31 and a large-sized bearing 32. A cooling medium feeding hole 30c communicated with a cooling medium feeding space part 30a formed inside between these bearing parts 31 and 32 is opened in the rotating shaft member 7. The rotating shaft member 7 is supported under stable condition even through the whole length is shortened. In addition, a tool storing part is provided in a handle member for gripping and tools for maintenance are stored therein to improve processability.