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 MoreExcel PMC-5T18 Spindle Repair
The Excel PMC-5T18 is a CNC vertical machining center that is compact and capable of high speed machining. It comes equipped with a pulley driven and grease lubricated spindle that can run up to 20,000 rpm.
CHALLENGE
Our inspection of this Excel PMC-5T18 spindle showed that the interior was contaminated with coolant which had degraded the grease in the front quad set of bearings. We also noticed that the tooling taper had significant wear which prevented an acceptable level of tool contact. This spindle has a unique design in that there are only seven Belleville washers which are located externally to the rear of the spindle bearing housing. Unfortunately, this location affords no protection against wear due to contamination with coolant, chips or other foreign material.
SOLUTION
The following actions were performed on this Excel PMC-5T18 spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings
- Replace specialty bellevilles
- Replace gripper balls
- Replace bearings
- Kiss grind tooling taper
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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