Importance

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Abstract

A tool position correcting device comprises a draw bar supported for axial movement in a central bore of a spindle of a machine tool, a tool holder supported for turning about an eccentric axis displaced from the axis of rotation of the spindle on the nose of the spindle, and a motion converting mechanism operatively interlocking the draw bar and the tool holder to convert the axial motion of the draw bar into the rotational motion of the eccentric rotary member. The spindle is provided with a tapered hole tapering backward in its front end, the tool holder has a tapered portion tapering backward and conforming with the tapered hole of the spindle and is held on the spindle with its tapered portion supported on balls in the tapered hole, and a spring is disposed between the spindle and the tool holder to bias the tool holder backward relative to the spindle so that the tapered portion is pressed through the balls against the tapered surface of the tapered hole so that the tool holder can be turned by a comparatively small torque when correcting the position of the cutting edge of the tool, and the composite fastening effect due to the tapered hole, the tapered portion and the spring provides a large force for holding the eccentric rotary member firmly on the spindle.

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First Claim