| 摘要 |
<p>A drill, designed especially in order to be mounted on a programmable machine and for drilling a stack of pieces, is equipped with an engaging nose (46) which, when it bears against the pieces to be drilled, compresses a spring (50). This spring, bearing on the body (10) of the drill, then applies to the pieces a flattening force preventing the formation of burrs between the pieces. The engaging nose (46) can preferably be removed and is provided with a rotating stop (58) limiting the depth of the drilling or milling. The retraction of the nose (46) following the engagement with the piece can advantageously be used in order to trigger the drilling cycle. Lastly, the drill is equipped with an automatic quick tool-changing device (18, 20, 26). <IMAGE></p> |
