OKK HM80 Spindle with excessive run out



CHALLENGE

Our customer indicated the spindle had excessive run out in the machine. After our breakdown and evaluation we found that the bearings had failed from coolant contamination (full of dried coolant residue.) Shaft taper had 6-8µ run out. Front & rear shaft journals had scoring and 2-4µ runout. Front shaft nut spanner holes & rear balance ring pin holes were damaged. Coolant plungers are worn.

SOLUTION

Clean, inspect overall dimensions. Kiss grind shaft taper. Grind, plate & finish grind front & rear journals. Rework front shaft nut & rear balance ring. Replace coolant plungers. Replace bearings, o-rings & screws. Adjust preload, assemble and break in. Final quality control inspection.

DETAILED CAUSE OF FAILURE

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