Patent ID: 8221398

Claim:
A remote controlled actuator which comprises a spindle guide section of an elongated configuration, a distal end member fitted to a distal end of the spindle guide section through a distal end member connecting unit for alteration in attitude, and a drive unit housing having a base end of the spindle guide section connected therewith; in which the distal end member rotatably supports a spindle for holding a tool; the spindle guide section includes a rotary shaft for transmitting rotation of a tool rotation drive source, provided within the drive unit housing, to the spindle and a guide hole opening defined therein so as to extend from one end to the opposite end; an attitude altering member for altering the attitude of the distal end member as a tip end thereof selectively advances or retracts in contact with the distal end member is reciprocally movably inserted within the guide hole; and an attitude altering drive source for selectively advancing or retracting the attitude altering member is provided within the drive unit housing; and in which there is provided a cutting force estimator for estimating at least one component force of a principle force, a radial force and a feed force in a cutting force which the tool applies to a work to be processed.