| 摘要 |
PROBLEM TO BE SOLVED: To provide a drilling machine to prevent breakage of a drill and to improve working efficiency. SOLUTION: This drilling machine has a control part 5 furnished with the drill 1 and a contact sensor 2 to approach and separate from a drilling article B together and to control the drill 1 so as to increase approaching speed of the drill 1 to the drilling article before contact of the sensor 2 and to decrease drilling speed of the drill 1 to the drilling article B after the contact of the sensor 2 by making contact with the drilling article B in advance of the drill 1.
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