Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……Read More
Famu PHS-912 FIVE Gruppo Parpas Spindle Repair
This two-axis milling head was factory-installed on a Famu PHS-912 FIVE machine by the Italian manufacturer Gruppo Parpas. Our customer indicated that a coolant component had failed, flooding the spindle which caused the drive to trip the machine off. Our inspection showed that one phase of the stator had burned out. We also determined that the bearing grease had been severely contaminated, and that spindle had several significant dimensional issues as well.
Our comprehensive plan of action started with a stator rewind. We also performed several grind, chrome plate, and finish grind operations to correct severe egging of the rear bearing housing ID and OD, fretted and undersized front and rear bearing journals, excessive runout of the HSK32 taper and face, and brinelling of the ball cage housing ID. We balanced the spindle shaft with all installed components on our Schenck machine, and then reassembled the spindle with the rewound stator and the precision ground components. We installed new ceramic bearings, Belleville springs, tool gripper fingers, o-rings, and assembly screws.
After reassembly of all components, adjusting bearing preload, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.
DETAILED CAUSE OF FAILURE
Spindle disassembled ready for evaluation for cause of failure and scope of work.
Damaged stator wire shorted to ground from coolant contamination.
Fretting on the front bearing journal.
Contamination in the bearing grease.
Contamination that was leaking from inside the spindle through the rear cover.
Fretting on the shaft from incorrect stator fit to the shaft.
Coolant found in the stator.
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