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 MoreDaewoo DMV 4020L Spindle Repair
The Daewoo DMV 4020L is a CNC vertical machining center. It comes standard with a grease lubricated and pulley driven spindle capable of running up to 12,000 rpm.
CHALLENGE
This Daewoo DMV 4020L spindle was sent in to Northland Tool and Electronics for a breakdown and evaluation. Upon inspection, we noted that the interior of the spindle was heavily contaminated with oily coolant sludge. The grease in the bearings was degraded from coolant and particulate contamination. We then measured and inspected the critical dimensions and found a couple issues. First, the tooling taper ID was pockmarked with excessive runout >8µ. Lastly, the gripper fingers had wear and damage to critical holding surfaces. No other dimensional deviations were noted for this rebuild.
SOLUTION
The following actions were performed on this Daewoo DMV 4020L spindle:
- Clean, inspect overall dimensions
- Kiss grind the tooling taper ID
- Replace ceramic bearings, bellevilles, grippers, 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.
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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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