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AssigneeHitachi Koki Co., Ltd.
InventorsToshiaki Uchida, Masateru Niyada, Shigeru Shinohara, Hiroaki Orikasa, Hiroyasu Ishikawa
Estimating the term…
An automatic drilling machine has an electric drilling unit on which a cylindrical cutter is rotatably mounted. The drilling machine includes a drill motor for rotating the cutter and a feed motor for linearly moving the cutter for the purpose of drilling into materials such as concrete. The current flowing through the drill motor before a drilling load is imposed thereon is detected for a microprocessor to determine the type of the cutter being used. The drill motor is driven at a rotation speed suitable for the cutter being used and the feed motor is driven at a speed such that the rotation speed of the drill motor thus set is maintained unchanged. Particularly, the drill motor is driven at a reduced rotation speed from the start of drilling until a predetermined drilling depth is reached to reduce chatter vibration which may otherwise be generated if the drill motor is driven at a regular constant speed from the beginning of drilling until the end.
A method of controlling a drilling machine including a drilling unit which has a drill motor, said drill motor rotating a cylindrical cutter mounted on said drilling unit when supplied with a driving current, and a feed motor operatively coupled to said cylindrical cutter for linearly moving said cylindrical cutter for drilling into a material, the method comprising the steps of:
A drilling machine comprising;
A drilling machine comprising:
A drilling machine comprising:
Dependencies are inferred from the claim text.