A prominent German manufacturer of high precision, 3-5-axis machining centres, Hermle AG, has added the C250 to the C400 model that it launched in 2012. In the process, it has started to create a new machine series that sits alongside the manufacturer’s core range, which comprises six models from C12 to C 62.
Sales and service agent in the UK and Ireland, Gosport-based Geo Kingsbury, said that here have been no compromises in the build quality of the C250 machining centre or indeed its larger counterpart. The only limitation is that they are available with fewer options, which is the reason for their economical price.
The working envelope of the C250 is defined by X,Y,Z axis travels of 600, 550 and 450mm, positioning it in capacity between the C22 and C32. Every Hermle machine shares the same fundamental attributes including a modified gantry design, mineral cast bed and an integrated, trunnion-mounted rotary table for the fourth and fifth CNC axes, if specified. All these features contribute to rigidity, low vibration and high machining accuracy.
In the 3-axis version, the rigid table can accept workpieces weighing up to 1,100kg, while precision machining of components up to 450x355mm and weighing 300kg is possible on the ±115° swivelling rotary table of the 5-axis version. Minimal idle times result from 6m/s2 acceleration to 35m/min rapids in all axes.
Spindle options are 15,000 or 18,000rpm (20kW/180Nm) and both are equipped with Hermle's patented collision protection system. In the event of impact in the Z-axis direction, the energy is absorbed by six displacement sleeves to minimise and often prevent spindle damage.
The integral magazine for 30 tools can be expanded by 50 or 88 additional pockets. Various other options include enhanced cooling and chip management as well as tool breakage monitoring and measurement.
Standard CNC system is Heidenhain’s TNC 640, which offers the full programming capability of this proven, high-end control. The GUI has a large, full colour, 19" TFT flat panel monitor and the control can be height-adjustable for improved ergonomics. Hermle macros are built in to provide the operator with additional support for complex milling.