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 MoreChevalier Smart-H818 II Spindle Repair
The Chevalier Smart-H818 II is a CNC surface grinder. It comes equipped with a grease lubricated and belt driven spindle capable of running up to 7,000 rpm.
CHALLENGE
This Chevalier Smart-H818 II spindle rotated freely when it arrived at Northland Tool and Electroncis, but the bearings felt very worn when spun by hand. After finishing a breakdown and evaluation, we noted that all of the bearings were heavily contaminated with rust and a brown particulate. The rear housing had fretting damage and was out of ISO. Lastly, both bearing journal shoulders were measure and had high run out. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Chevalier Smart-H818 II spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, and o-rings
- Kiss grind the front and rear bearing journal shoulders
- Grind, chrome plate, and finish grind the rear housing
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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