Fischer Precise SC80 rear bearing failure in a high-speed motorized ID grinding spindle



CHALLENGE

Fischer Precise SC80, 40,000 RPM, oil mist lubrication, motorized spindle

Our customer uses many CNC machining and turning centers to produce precision small arms components for military and commercial firearms manufacturers. They also employ a large complement of centerless, surface, cylindrical and CNC tool and cutter grinders. The bearings in this ID grinding spindle from a universal cylindrical grinding machine were very difficult to rotate in assembly incoming. Upon disassembly we observed that the rear pair of bearings had suffered catastrophic failure during which the cages containing the rolling elements had been destroyed. Our tests of the integral motor did not indicate any electrical issues.

SOLUTION

Our customer was fortunate in that we did not observe any significant dimensional deviations of the shaft or housing. We proceeded to rebuild the spindle with all new bearings, o-rings and assembly screws. We finished this straight rebuild with our final test run, break-in, trim balance and final QC.

DETAILED CAUSE OF FAILURE

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