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
Kitamura Bridge Center-8 Spindle Repair
The Kitamura Bridge Center-8 is just as the name says. It is a bridge style CNC vertical machining center. It comes fitted with an oil mist lubricated and gear driven spindle capable of running up to 10,000 rpm.
This Kitamura Bridge Center-8 spindle’s bearings were noisy and felt rough when rotated by hand in assembly incoming. After disassembly, we noted that the front bearing quad set and rear roller all felt very rough when rotated by hand. There was also fretting noted on all the bearing races. We then measured the critical dimensions (bearing journals, housing, taper, etc.) and found a few issues. First, the tooling taper ID had high runout of 4µm. Second, the 80mm front bearing journal had very high runout >5µm. Lastly, the drawbar was heavily contaminated and the drawbar nut was stuck on and had to be machined off. No other significant dimensional deviations were noted.
The following actions were performed on this Kitamura Bridge Center-8 spindle:
- Clean, inspect overall dimensions
- Rework damaged drawbar threads
- Grind, chrome plate, and finish grind the 80mm front journal
- Kiss grind the tooling taper ID
- Replace all bearings, drawbar nut, 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.
Does your spindle need repair? GET A QUOTE TODAY
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.
Kitamura HX400I Spindle Repair
This Kitamura HX400I spindle had been crashed and the front bearings were noisy when rotated. The shaft taper was cracked on both sides where the… [...]
Kitamura Mycenter 0 Spindle Repair
This Kitamura Mycenter 0 spindle was pulled by our customer because it started “growling” when it was run. Upon breakdown and evaluation, we first noted… [...]
Kitamura Mycenter 2X Spindle Repair
This Kitamura Mycenter 2X spindle was sent in with a broken orientation ring and the screws broken off in the low speed gear. The grippers… [...]
Kitamura Mycenter 2Xi Sparkchanger Spindle Repair
The Customer did not provide the drawbar assembly nor the drive gear and mounting hardware. After disassembling the spindle, we noted that the rear roller… [...]
Kitamura Mycenter 3XIF Spindle Repair
This Kitamura Mycenter 3XIF spindle suffered a catastrophic rear roller bearing failure which allowed debris to contaminate the #3 and #4 bearings (rearmost in front… [...]
Kitamura Mycenter 3XiH Spindle Repair
Prior to shipping this high speed vertical machining center spindle to us, our customer indicated that it was very noisy when operated above 12,000 RPM.… [...]
Downtime is inevitable for any machine, but knowing how to reduce downtime or minimize its likelihood is critical.Read More