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 MoreGMN TS70CS120 Spindle Repair
The GMN TS70CS120 is a tool and cutter grinding spindle. It comes grease lubricated, belt driven, and capable of running up to 10,000 rpm.
CHALLENGE
Our customer sent in this GMN TS70CS120 spindle saying it was noisy and that it had failed. When the spindle arrived at Northland Tool and Electronics we first noted that the spindle felt rough and was very noisy, as the customer stated, incoming. Upon disassembly and evaluation, we noted that the front bearings were heavily contaminated and had failed. From the front bearings failing, there was catastophic damage to the front bearing journal. Lastly, we measured high run out on both the front and rear OD tapers.
SOLUTION
The following actions were performed on this GMN TS70CS120 spindle:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and assembly screws
- Grind, chrome plate, and finish grind (GPG) the front bearing journal
- GPG both the front and rear OD tapers
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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