Description of the application
The here described bearing is used in filament winding machines for the paper industry. It supports the centre sleeve, that transports the to be wrapped paper roll. The paper rolls have a diameter of 2 m and the shaft has a length of 3 m. The bearing was up-to-now made of bronze.

Problem
With the lubricated bronze bearing the precision was a problem also with a solid lubricant. A material that allows a higher precision was needed. Furthermore, a low break loose torque is required.

Problem-solving
Here a plain bearing bush made of ZX-100K with a honeycomb structure, needed to reduce
the static and kinetic friction, has been used. The bushing is manufacture with a tolerance of 2-3 hundredths of a millimetre, with an outer diameter of 185 mm, an inner diameter of 165 mm and a length of 80 mm. The groove depth is 1 mm, the groove width 3 mm. The bearing clearance is 0,05 mm.

Working life
The bushings is been successfully used since 1992.

Advantages
70% price reduction , improved precision, dry running, no high break loose torque