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 MoreSiga 4R-85G-AP Spindle Repair
This Siga 4R-85G-AP spindle is grease lubricated, belt driven, and capable of running up to 2,500 rpm.
CHALLENGE
The bearings in this Siga 4R-85G-AP spindle felt very rough when rotated by hand in assembly incoming. All external assembly screws were loose incoming. After disassembly and evaluation, we noted that the rear roller bearing was missing all of its rolling elements and the races showed evidence of a catastrophic failure. The front roller and thrust bearings were heavily contaminated with particulate and had evidence of excessive heat. No significant dimensional deviations were noted (tooling ID pilot, bearing journal/shoulders, housing bores).
SOLUTION
The following actions were performed on this Siga 4R-85G-AP spindle:
- Clean, inspect overall dimensions
- Replace all bearings, 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.
DETAILED CAUSE OF FAILURE
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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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