Hurco VMX 42 Spindle Repair

A long time customer of Northland tool called us to look at two Hurco spindles to see if we could make one good out of them. After evaluation of both spindles we determined that we could use the housing from one and the rest of the parts from the other. With a little machining and grinding we were able to restore this spindle to OEM specifications for less than a third of the cost of replacement.

Possible cause of failure:
Bearing failure from coolant contamination, mostly in #1 and #2.
Rear shaft nut that preloads the bearings was hand tight.
Grippers are worn.
Drawbar rotory union drive fitting has light scoring.
Light fretting on the pulley id and pulley journal.
Taper has light wear.

Recommended action:
Clean, inspect overall dimensions.
Replace bearings, bellevilles, seals and grippers.
Adjust preload, balance, assemble and break in. Final quality control inspection.

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