Toyoda FA550-11 Spindle Repair

CHALLENGE

This Toyoda FA550-11 spindle arrived to our facility in rough condition.  Upon inspection, we noted the taper and OD of the shaft nose were damaged and the taper looks like it was hand ground with a die grinder.  The OD of the shaft nose had rubbed out with front cover ID.  We also noted that the drive dog and drive dog pocket on the shaft were damaged.  It appears that the spindle had been crashed, this could be the possible cause of the rotor being loose on the shaft.  The bearings were starting to fail from contamination and the front cover’s large coolant jets were damaged.  Lastly, the rear drawbar threads were slightly damaged.

SOLUTION

The following actions were performed on this Toyoda FA550-11 spindle:

• Clean, inspect overall dimensions
• Replace bearings, o-ring’s, encoder sensor, coolant jets, drive dog, lock washers, and bolts
• Replace bearings and orings in the actuator
• Repair drawbar thread damage
• Repair front cover ID damage
• Grind, chrome plate, and finish grind the 50 shaft taper. (CT tooling supplied)

RESULT

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.