FEATURES MAIN SPINDLE The sturdy spindle is micro-balanced and thus runs vibration-free. This is crucial to ensure a high machining quality and a long service life of the bearings. The spindle is driven by a coupled AC servo motor with high-resolution rotary encoder. Like a CNC axis, it can be accurately positioned for the workpiece change. The spindle is prepared for installation of the work- piece holding devices, which are normally provid- ed by the customer. Owing to the defined interface, the workpiece holding devices can be exchanged in the shortest possible time, so that different parts can be machined on the machine. In addition, the spindle can be supplied with a centre hole with vacuum and compressed air connection. The vacuum serve to support the insertion of the workpieces and to check work- piece presence and position. The compressed air can be used to actuate ejector pins or the finished machined workpiece is blown out directly. The spindle is available in two sizes. 08 SWIVELLING DOWNHOLDER To ensure the workpieces can be machined over their full height at the outside diame- ter, they are positioned accordingly on the workpiece holding device and are held on the spindle during machining by a swivelling downholder. This downholder consists of a pneumatic swivel cylinder with a pivoted mould pressure piece.