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.
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Daewoo L200A Spindle Repair
Our customer sent in this Daewoo Lynx 200A 5000 RPM lathe spindle which had seized. They indicated that the spindle had become very noisy, but then proceeded to run it for another two days. Our evaluation showed that the grease lubricated bearings failed due to extreme coolant contamination, which likely occurred because a front cover drain had become completely blocked. We also discovered that the pulley ID and the pulley journal OD were both severely fretted. This damage was corrected by grinding, chrome plating & finish grinding the pulley journal and replacing the pulley. We replaced the pulley because you cannot G/P/G two mating surfaces.
This customer made two critical errors that lead to us rebuilding the spindle with new ABEC 7 class precision bearings. The first was not following a preventative maintenance schedule, which needed to include checking that front cover drain remained clear. Coolant will eventually get into your spindle, and it needs a way to get out. The second error was to ignore the signs of impending bearing failure, in this case the extremely loud noise during operation. Not heeding this increased the cost and lead time of the rebuild process. The customer could have also taken steps to check the operating temperature of the spindle, or even could have used vibration analysis to determine bearing condition.
CHALLENGE
- Spindle was seized incoming, bearings contaminated with coolant sludge, front cover drain was clogged.
- Pulley journal is fretted & has two undersized bands -37/-45µ, pulley ID is fretted & has two oversized bands +60/+70µ.
- Pulley nut has pre-existing punch marks from attempts at removal.
- OD lathe taper and face are very pitted, pre-existing tick mark on taper.
SOLUTION
The following actions were performed on this Daewoo L200A spindle:
- Clean, inspect overall dimensions.
- Replace bearings, drive pulley, pulley nut and o-rings.
- Grind / chrome plate / finish grind pulley journal.
- Kiss grind OD lathe taper and face – some pitting may remain.
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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Bearing contamination from blocked drain
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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.
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Doosan Ace-HP4000 BIG PLUS Spindle Repair8,000 rpm 40 Taper Spindle had 25 microns of run out in the taper and was contaminated with coolant causing the bearings to fail. Our evaluation determined that coolant was entering the spin [...]
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Daewoo DHP 5000 Spindle RepairWhen this Daewoo DHP 5000 spindle arrived at Northland Tool and Electronics we disassembled it and performed a full evaluation on it. Upon inspection, we… [...]
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Daewoo L200A Spindle RepairSpindle was seized incoming, bearings contaminated with coolant sludge, front cover drain was clogged. Pulley journal is fretted & has two undersized bands -37/-45µ, pulley… [...]
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Doosan Puma 2500 LSY Spindle RepairDoosan Puma 2500 LSY Spindle Rebuild Our customer sent us this spindle for repair because it had been crashed about a year prior and was making noise. It also developed a “flat spot” that you cou [...]
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Featured Repair
Bridgeport Torq-Cut 22 Spindle Repair
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