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
Kasuga Q-1500V Spindle Repair
The Kasuga Q-1500V is a large CNC vertical machining center. It comes equipped with a grease lubricated and pulley driven spindle capable of running up to 6,000 rpm.
This Kasuga Q-1500V spindle was seized upon arriving at Northland Tool and Electronics. After disassembling the spindle we noted that the front quad set of bearings had failed due to contamination. The grease was completely washed out and they were corroded with a couple broken cages. Interestingly our customer-supplied print indicates a rear pair of angular contact bearings, but we removed a tapered roller bearing!! We then measured all critical dimensions (bearing journals, housing, taper, etc.) and found some unacceptable deviations. First, the shaft and rear labyrinth cover have multiple balance marks, possibly from component balancing. Second, the taper was pock marked and had uneven tool contact. Lastly, the drawbar shaft was heavily pitted from corrosion, likely a result of a previous rotary union failure.
The following actions were performed on this Kasuga Q-1500V spindle:
- Clean, inspect overall dimensions
- Kiss grind the drawbar shaft
- Kiss grind spindle shaft taper
- Replace bearings, Bellevilles, crush rings, lock washers, o-rings, and assembly screws
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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In this helpful guide to spindle bearing preload, Northland Tool & Electronics will answer all the basic questions about your spindle bearing preload calculations.Read More