Matsuura-MC500V Spindle Repair

Our customers send us this type of Matsuura spindle in pairs. As it is a twin spindle machine we rebuild the spindles with that in mind. When we grind the tapers it may change the tooling orientation. To accommodate this we grind the shafts sequentially and match the critical dimensions. We also set the spacers for the installation so the installer does not have to go through that labor intensive process on site.

Possible cause of failure:
Front and rear bearing failure from coolant contamination.
Shaft taper is worn and looks slightly bell mouthed, has 6-8µ runout.
Front journal has 16µ runout.
Rear shoulder of drive pulley has slight damage.

Recommended action:
Clean, inspect overall dimensions.
Replace bearings, bellevilles, gripper balls and o-rings.
Grind, chrome plate and finish grind the BT35 taper and 70mm front journal.
True up pulley shoulders.
Adjust housing spacers.
Adjust preload, balance, assemble and break in. Final quality control inspection.



DETAILED CAUSE OF FAILURE

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