Mori Seiki NZ2000 With Loose Rotor



CHALLENGE

Our customer sent us this spindle because of vibration and poor part finish during operation. Upon disassembly we found: Front quad bearing set lightly contaminated with cutting oil, grease was starting to discolor. 110mm shaft rotor journal is fretted -20µ where front of rotor locates. Front of rotor ID is lightly fretted.

SOLUTION

Recommended action: Clean, inspect overall dimensions. Grind, plate & finish grind 110mm shaft rotor journal. Replace bearings, o-rings & screws. Adjust preload, assemble and break in. Final quality control inspection.

DETAILED CAUSE OF FAILURE

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