| 摘要 |
The chuck (1) for the central clamping of a rotary cutting tool in the spindle of a machine tool has a tapered bore (3) to receive a collet (4), which has a number of longitudinal slits (6) forming elastically deformable segments (7). As the collet is pressed into the tapered bore, the segments are pressed radially inwards and grip the stem (10) of the tool. The inner end of the axial hole in the collet has a square or polygonal cross-section (18) to provide a positive grip on the end part of the stem, which has a matching cross-section. ADVANTAGE - Reliable tongue transmission for tapping tools.
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