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 ACE-H50S Spindle Repair
The Daewoo ACE-H50S is a CNC horizontal machining center with a pallet changer for high production machining. It comes equipped with a gear driven and grease lubricated spindle capable of running up to 10,000 rpm.
CHALLENGE
This Daewoo ACE-H50S spindle arrived at Northland Tool and Electronics completely seized. Upon disassembly it was found that the bearings were heavily contaminated with coolant and the grease was severely degraded. The rear hydraulic nut was leaking and had to be pressed off to continue with the breakdown. It was also noted that the gripper (collet) assembly was worn. We then measured all the critical dimensions (bearing journals, housing, taper, etc.) and found quite a few unacceptable deviations. First, the rear hydraulic nut journal and front roller journal had excessive runout. Second, the shaft tooling taper was damaged and had uneven tool contact and gap. The tooling taper also had excessive runout. Third, the front housing ID was 7µ egged, -8/-15µ where front roller bearing locates. Lastly, the front of drawbar was bent 60µ, the rear was worn undersized 70µ, and the middle was grooved. The drawbar nut set screws were missing as well.
SOLUTION
The following actions were performed on this Daewoo ACE-H50S spindle:
- Clean, inspect overall dimensions
- Grind chrome plate & finish grind (GPG) tooling taper, front roller journal, and rear hydraulic nut journal
- GPG front housing
- Replace bearings, bellevilles, gripper assembly, drawbar, GMN seal, o-rings, and assembly bolts
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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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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