The Bridgeport Torq-Cut 22 is a smaller CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 7,500 rpm.
Read MoreToyo HFD05-57 Spindle Repair
The Toyo HFD05-57 is a high speed grinding spindle that is oil mist lubricated and stator driven. It is capable of running up to an astonishing 50,000 rpm.
CHALLENGE
Our customer has a large population of these high speed grinding spindles which are used in the production of tapered roller bearings for automotive axle and transmission systems. The cause of failure of the hybrid ceramic bearings was typical for this spindle: heavy contamination of the front pair with grinding swarf. The contamination did migrate to the rear pair, which were also beginning to approach failure. The spindle motor passed all incoming tests, but we did notice a groove worn into the ID of the quill pilot. There were no other significant dimensional deviations of the bearing journals and shoulders, or in the housing bores.
SOLUTION
We completed a grind, chrome plate, and finish grind to remedy the groove in the ID of the quill pilot, and component balanced the shaft assembly on the Schenck balancer. We rebuilt the spindle with all new hybrid ceramic bearings, gasket, o-rings, and assembly screws.
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.
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More Case Studies
Repair History - Here are examples of similar spindle repairs that may contain additional information that will help you. If you have additional questions, please contact us.
It’s a fact of machining — eventually, even top-of-the-line turning machines will experience a spindle failure. Spindles endure tension, torsion, heavy loads, and speeds up to and beyond 150,000 RPM, to name a few of the standard stressors.
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