Automatic Screw Machining Automatic screw machining is a machining process that uses the principle of turning the part (lathe) and advance cutting and forming tools of all sorts (drills, form tools, milling cutters, taps, dies, etc.) to shape the part. The process can consist of one, five, six or eight spindles to shape round, hex or square bars of raw material into cylindrical parts. The bars of raw material are held by collets in turning spindles and the cutting tools approach from both the sides and end of the bars to machine parts. For example, on a six spindle machine, you have six tools on six cross slides and six tools on an end slide cutting simultaneously on six parts. The six spindles holding the work pieces are mounted on a circular carrier that indexes sixty degrees each cycle thus advancing each part further toward completion. At the beginning of the cycle the tools advance into the part cutting material away leaving the net shape at the end of the cycle. The parts are at six phases of completion the last being where the part is cut off from the bar of raw material. Used automatic screw machines are classified as A8006, A8125 and A8175 for multiple, single and N/C and CNC machines respectively. Acme Gridley, Brown & Sharpe, Davenport, Conomatic and National Acme manufacture multiple and single spindle automatic screw machines. See our Used Automatic Screw Machine Inventory Back