| 摘要 |
Collet arbor especially adapted for use in computerized numerical controlled turning and milling procedures. The latter comprises four coaxially assembled elements: a clamping holder sleeve having a screw-threaded socket at the inner end, and a smooth, cylindrical interior except for an internal screw-threaded step, near the outer end; an externally-flanged hollow cylindrical adapter comprising an annular recess at its outer end and a stepped shank which screws into the screw-threaded step of the holder; a bushing with a flanged end which fits into the recessed adapter providing an inwardly-tapered mouth and a cylindrical barrel interposed into the adapter and holder for accommodating a collet; and a draw-screw having a hollow, internally-threaded head, externally smooth, which has its schank screwed into the holder socket so that the screw moves slidably in an axial direction in the cylindrical interior of the holder, the draw-screw head disposed to bear against the inner edge of the bushing barrel. When the screw-threaded end of a collet enclosing a work tool in its jaws is screwed into the hollow-headed draw-screw, collet and bushing may be moved forward in axially controlled relation in the holder sleeve, bearing against the tapered mouth of the bushing which serves to tighten the collet jaws about the tool, and control the position of the tool in relation to the work.
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