Studer offers Kronos S 250 CNC centreless grinder

Studer has introduced the Kronos S 250 CNC centreless grinder machine concept.

The maximum diameter of the grinding wheel was enlarged to 400-450mm and, as a result, a 30 per cent lifetime increase was achieved.

The design of the cross-slide unit located on both the grinding wheel and regulating wheel side, combining dynamic digital drives and a high-precision ballscrew unit, enables the machine to operate only from four CNC axes.

This design provides the same functionality and flexibility as a six-axis machine.

The Kronos S 250 is designed for in-feed and through-feed grinding, using both conventional and CBN grinding wheels with a diameter range of 1.5mm to 35mm and an in-feed width of up to 245mm.

The utilisation of high-performance grinding wheel spindles and maintenance-free hybrid roller bearings allows the use of CBN grinding wheels with a peripheral speed up to 150m/s.

Another highlight of this machine is the special dressing system for the grinding and regulating wheels by means of four CNC axes in the centre on the workpiece level.

For the grinding wheel dressing, there are optionally stationary or rotating dressers available, which can quickly be changed.

The stationary grinding gap allows the use of low-cost automation equipment, which does not require any follow-up axis.

An integrated handling system with an interface for external transport and palletising devices can be offered as standard.

The compact design of the machine results from the integration of the control cabinet directly fixed onto the machine bed.

This allows users to considerably reduce setup and commissioning time.

The full-size housing of the machine complies with strict environmental requirements, so that various coolant types, such as emulsions and grinding oil, can be used.

Widely opening sliding doors provide access to the grinding centre.

This machine enables the well-directed grinding of diameter and front face in only one operation by using a six-degree angled spindle unit.

Oscillating grinding with a distance of +/-50mm is a further possibility for the centreless machining of extremely hard materials.