TOOLHOLDER ASSEMBLY FOR MACHINE TOOL

摘要

In a device for feeding a quill of machine tool, which is slidable axially in a support, the quill is threaded externally and cooperates with a lead nut rotatable concentrically with respect to the quill and is integral with a gear rotatable to effect the advance of the quill. The lead nut comprises two parts which are spaced axially by a flexible annular plate formed between an internal groove and an adjacent external groove in the lead nut to permit axial adjustment of the two parts. The lead nut includes two independent ball circulation circuits one for each one of the two parts respectively. The quill is mounted in the support by means of two elastic bushes spaced from one another and adjustable axially by means of a pressure collar to eliminate axial play of the quill.