Axial Bearing Damage
Dicing and back grinding spindles use air bearings. To keep the shaft spinning with high precision, both radial and axial (thrust) bearings are required. The axial bearing holds the spinning shaft in the axial direction and resists thrust forces that act along the axis of rotation. HST can repair damaged axial bearings to like new.
Most of the damage we see on axial bearings is the result of contamination in the air supply or internal coolant leakage. But axial bearing damage can also result from contamination migrating past the front labyrinth seal.
Axial bearings typically are located toward the front of the spindle. They are referred to as the front thrust bearing, rear thrust bearing and the shaft thrust flange.
The front axial bearings are often damaged from contamination entering the spindle through the labyrinth seal. If the spindle is not properly setup or maintained, cutting slurry can penetrate the seal and work its way between the front axial bearing and the shaft thrust flange severely damaging both surfaces.
Internal leakage often results in damage to the rear thrust bearing.
How to Repair an Axial Bearing:
Step One: Remove damaged bearing from bearing housing:
Step Two: Rough machine bearing material:
The shaft thrust surfaces are also damaged from contamination and must be restored to pristine condition for the spindle to perform like new.
It is critical that all surfaces involved with the axial bearing systems are perfectly flat, parallel and perpendicular to the axis of rotation. Additionally, the original air gap space must maintained. So when any changes in the shaft axial thrust flange are made because of excessive wear, they must be compensated for with the thrust spacer.
Shaft thrust surfaces require precision grinding to restore them to like new performance.
When we repair your dicing spindle or other air bearing spindle performance is tested. We have different test stands and methods to guarantee your spindle will meet our stringent performance criteria.
HST can repair your dicing, back grinding or other air bearing spindle no matter what the damage. All of our air bearing repairs are fully guaranteed.