Verfahren und Vorrichtung zum Einstellen einer Spannzange in einem Maschinenwerkzeug

摘要

A collet adaptor and method is provided for adjusting a collet (2) in a machine tool. The collet adaptor has a body or arbor (10) with a cylindrical bore (14) for receiving a cylindrical portion (20) of the collet (2) and a tapered surface (18) at its front end for engagement with a tapered split head (21) portion of the collet (2). An anti-rotation screw (40) prevents rotation of the collet (2) relative to the collet arbor (10). The collet arbor (10) has an accurately ground planar rear surface (5) which is bolted to a planar front face (6) of the headstock (4) of a rotatable spindle so as to correct for errors in concentricity. The collet adaptor also includes a plurality of adjustment pins (51) engageable with the cylindrical portion (20) of the collet (2) at circumferentially spaced locations around the collet which provide a fine adjustment to compensate for errors in angularity between the angle of the central longitudinal axis of the collet (2) and the central longitudinal axis of the collet adaptor (10).