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 MoreDMG Mori TV-400 Spindle Repair
The DMG Mori TV-400 is a CNC vertical machining center. It can come fitted with this grease lubricated spindle that is capable of running up to 8,000 rpm.
CHALLENGE
Our customer sent in this DMG Mori TV-400 spindle stating that the tool holder rattled around for a few seconds while making a cut. Once the spindle arrived at Northland Tool we completed a full disassembly and evaluation.
This is what we found:
- ID 30 taper was heavily worn and had a deep groove right at the start of the taper (Pic 3)
- Front bearing grease had been washed out by coolant and they were contaminated with a brown particulate (Pic 1)
- Several of the Belleville’s are broken and would have caused loss in draw bar force (Pic 2)
- Loss in draw bar force allowed for the tool to rattle around in the taper and cause severe damage
SOLUTION
The following actions were performed on this Daewoo DMV500S spindle:
- Replace bolts, bearings, gripper balls, and bellevilles
- Grind-Plate-Grind the ID 30 taper due to the deep groove and high run out
- We are unable to test run the spindle due to it is just shaft and bearings
RESULT
After reassembly of all components and adjusting bearing preload 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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