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
Robodrill Spindle Repair
The Fanuc Robodrill is a compact CNC vertical machining center made for high production work. It comes equipped with a grease lubricated and coupling driven spindle capable of running up to 24,000 rpm.
Our customer has a large complement of high-speed vertical machining centers which are used to produce job shop parts orders for their customers, as well as for mold making in support of their in-house injection molding facility. They contacted us while they were in the process of replacing a bad motor in one of their 24,000 rpm Fanuc Robodrill machines. They felt that the spindle bearings were suspect as well, and asked us to evaluate the spindle in our facility. We found that the bearing grease was not particularly contaminated, and that the rear pair of hybrid ceramic bearings had significantly more wear than the front pair. This led us to the conclusion that vibration and shaft runout of the motor had caused the rear bearings in the direct-coupled spindle to repeatedly load and unload, causing premature deterioration.
As we found no significant dimensional deviations of the tooling taper, shaft journals and shoulders, or in the housing bores, our solution was a “straight” repair of the spindle. We rebuilt the spindle with all new ceramic bearings, gripper force balls, 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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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.
Fanuc Robodrill Spindle Rebuild
This Fanuc Robodrill spindle suffered a rear bearing failure due to a fretted and over sized rear housing. When our customer sent in the spindle… [...]
Fanuc Robodrill Problem Solving
This Robodrill spindle is from a customer that we initially helped by trouble shooting their spindle problems and since then we have done all their… [...]
Downtime is inevitable for any machine, but knowing how to reduce downtime or minimize its likelihood is critical.Read More