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
Mazak Variaxis 730 Spindle Repair
The Mazak VARIAXIS is a highly versatile line of full, simultaneous 5-axis machining centers that perform multiple and complex curved surface machining on large, heavy workpieces in single setups.
Upon initial inspection, the spindle felt very rough with loud bearing noise when rotated by hand.
The actuator and rear of spindle were heavily contaminated, and it appeared that the rotary union had been leaking coolant for some time. The rear roller bearing suffered catastrophic failure. Encoder sensor was damaged and the encoder ring showed wear. The actuator and drawbar had rubbed out, and the rear of the drawbar shaft had severe damage. Further inspection uncovered that the #1 and #2 front bearings were heavily contaminated with coolant. The tooling taper was pockmarked with uneven tool contact. Gripper fingers (collet) showed significant wear.
This spindle rebuild required the following actions:
- Grind, chrome plate, finish-grind BIG Plus 50 taper ID
- Replace bearings, Bellevilles, oil line, seals, o-rings, and assembly screws
- Customer obtained and provided the following OEM parts:
Rotary union, grippers, encoder, encoder ring, upper drawbar shaft, actuator push plate & ferrules
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.
DETAILED CAUSE OF FAILURE
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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.
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Downtime is inevitable for any machine, but knowing how to reduce downtime or minimize its likelihood is critical.Read More