Importance

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Abstract

An interchangeable machine tool holder unit for use in a machining apparatus for the support of a machining element, for example, a cutting bit, which includes an elongated rotary body adapted to be driven in one direction about the longitudinal axis thereof, a tool holder supported in end-to-end fashion by the rotary body for movement in a direction radially of the rotary body, an axially displaceable member axially displaceably carried inside the rotary body, and an indexing mechanism for causing the axially displaceable member to move in the axial direction each time the rotary body undergoes one complete rotation to permit the tool holder to move in the radial direction. During the continued rotation of the rotary body in one direction, the displaceable member is axially moved in response to each complete rotation of the rotary body, and the movement of the displaceable member results in a radial shift of the tool holder to permit the cutting bit to effect counterboring, drilling or cutting of a workpiece.

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First Claim