| 摘要 |
An adapter for facilitating use of a bullnose mounting fixture on the spindle of a unit of machining equipment with a collet having a collet head larger than the bullnose bore includes a collet-receiving component disposed symmetrically about an adapter rotational axis. An adapter bore through the collet-receiving component with the collet body so that the collet body fits coaxially into the adapter bore. A collet-head-receiving portion of the collet-receiving component defines a collet-head-receiving space having a size and shape that mates with the collet head so that the collet head fits coaxially into the collet-head-receiving space for purposes of enabling the collet-head-receiving portion to close the collet head against a workpiece. A sleeve extending axially from the collet-head-receiving portion mates with the bullnose bore for purposes of mounting the collet-receiving component on the bullnose in an operative position such that the collet-head-receiving portion is disposed ahead of the forward face of the bullnose and the bullnose rotational axis and the adapter rotational axis coincide. One embodiment includes a collar that fits over the forward end portion of the bullnose. A collet adapter assembly includes the adapter, a collet, and an adapter-nut-and-machine-screw combination for coupling the collet to the draw tube on the unit of machining equipment. A mounting fixture constructed according to the invention includes at least two screw holes in its forward end for use in screwing a collet-head-receiving component onto the forward face of the mounting fixture.
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