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 MoreMori Seiki CL-20A Spindle Repair
The Mori Seiki CL-20A is a compact CNC turning center. This machine comes standard with a grease lubricated spindle that is capable of running up to 6,000 rpm.
CHALLENGE
This Mori Seiki CL-20A spindle was sent to us because of a crash. Upon inspection we noted that the front bearings were slightly contaminated and the pulley compression ring was damaged. We then measured the critical dimensions (bearing journals, taper, housing, etc.) and found a lot of issues. First, the nose of shaft was bent, and had excessive run out. Second, the face had 40µ runout, the taper had 40µ runout, and the front shoulder had 22µ run out. Lastly, the front taper was 10µ egged and the thrust bearing journal had 7-8µ run out.
SOLUTION
The following actions were performed on this Mori Seiki CL-20A spindle:
- Clean, inspect overall dimensions
- Replace bearings
- Kiss grind the face, taper, front shoulder to straighten shaft
- Replace pulley compression ring
- Replace o-rings
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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