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
Matsuura H.Plus-300 Spindle Repair
The Matsuura H.Plus-300 is a CNC horizontal machining center with a built in pallet changer. It comes equipped with a grease lubricated and coupling driven spindle capable of running up to 15,000 rpm.
This spindle came to us four years after we initially rebuilt it for our customer. Upon disassembly, we first noticed that the entire interior of the spindle was contaminated with coolant, even in the rear roller bearing. The #1 front angular contact bearing was thoroughly contaminated. We observed heavy fretting on the outer races of both front bearings and in the front housing bore. The housing was egged and oversized by up to 30µ where the bearings are located (ISO is ±7.5µ). We also spotted wear on several other spindle components that ranged from slight to significant. The tooling taper had excessive runout, and the gripper (collet) fingers, gripper sleeve, and drawbar t-bar pusher were worn on critical contact surfaces. The drawbar shaft also had significant wear from the action of the gripper fingers and the drawbar spring, which had left deep chatter marks. Our overall conclusion was that the spindle bearings and the other components were simply fatigued and worn from use.
We performed a grind, chrome plate, and finish grind of the front housing bore to bring that ID back to spec, which will help to extend the life of the new angular contact bearings. Because our customer does not use dual-contact Big-Plus tooling in this machine, we were able to correct the excessive taper runout with a simple one-step kiss grind. We reassembled the spindle with all new bearings, o-rings & assembly screws, and installed a brand new drawbar, spring & gripper assembly which corrected all of the wear issues we had observed.
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.
Matsuura MAM72-25V Spindle Repair
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This Matsuura ES-450HII spindle arrived seized to our facility. Upon inspection, we found that the rear roller bearing had catastrophically failed as the inner and… [...]
Matsuura MAM-700-HG Spindle Repair
This Matsuura MAM-700-HG spindle arrived to Northland Tool and Electronics completely disassembled, except for the drawbar. Upon inspection, we noted that the tooling taper was… [...]
Matsuura ES-800V PC2 Spindle Repair
When this Matsuura ES-800V PC2 spindle arrived at Northland Tool and Electronics we found a catastrophic rear roller bearing failure of the likes we have… [...]
Downtime is inevitable for any machine, but knowing how to reduce downtime or minimize its likelihood is critical.Read More