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
DMG 635 Spindle Repair
This spindle was running at 6,000 rpm when it “suddenly got real loud and smoked!”. This spindle can run up to 8,000 rpm max, and our customer occasionally runs at 8k but mostly at 6k rpm. In the past they replaced the spindle 5 times from the OEM and it has only lasted “about 7 months on average”. (DMG gave them “a couple” at no charge). They were told, by DMG, that coolant was getting in the spindle and washing out the grease. We asked, and the spindle does have air purge, which they do use. I asked him if they had a coalescent filter in line and they didn’t believe so-but he will check as he told me that “come to think of it, sometimes when they spray air out of the compressor water comes out like a hose!” I also suggested he check and see if the air purge goes off when the spindle is off and suggested that if it does, they should see about setting it so the air purge stays on for a 1/2 hour after the spindle is turned off. This is was RUSH REPAIR due to a MACHINE DOWN.
After discussions with our customer we decided to improve the spindle design by incorporating a bearing compliment that is more robust than what came with it from DMG.
- Spindle was seized incoming
- #1 and #2 bearings had catastrophic failures
- O-rings were worn
The following actions were performed on this DMG 635 spindle:
- Clean, inspect overall dimensions.
- Replace all bolts, o-rings, and bellevilles
- Due to the frequent failures of this spindle and the cause of failure identified during the evaluation we have determined a change in the bearing assembly will increase spindle life. We replaced the bearing compliment that increases the ridigity of the entire spindle assembly.
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