Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……Read More
Chevalier 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.
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.
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
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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Running this spindle too long caused deformed ball bearings and damage to the outer race Damage to the outer race is consistent with prolonged operation after spindle exhibited initial signs of needing to be rebuilt Every spindle rebuilt by North…Read More