The Bridgeport Torq-Cut 22 is a smaller CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 7,500 rpm.
Read MoreKitamura Mycenter HX400iF Spindle Repair
The Kitamura Mycenter HX400iF is a CNC horizontal machining center with a built in pallet changer. It comes equipped with an air/oil lubricated and gear driven spindle that is capable of running up to 13,000 rpm.
CHALLENGE
Our customer indicated that this horizontal machining center spindle was humming and producing a poor finish. When we broke the spindle down for evaluation, we noticed heavy coolant contamination in the front bearing quad set. We also observed that the tooling taper was bell mouthed, and the drive dogs (keys) and gripper (collet) fingers were heavily worn. In addition, our dimensional inspection showed that the drawbar had >200µ of runout in assembly. When disassembled, the drawbar springs were found to be broken and the drawbar shaft was bent with bare shaft runout of >150µ.
SOLUTION
Our overhaul of the spindle included grind, chrome plate, and finish grind of the tooling taper. Our customer could not afford the downtime on this critical machine, so they opted to pay a premium for us to accelerate the timetable for all rebuild operations. In addition to grinding the taper, we replaced the front quad set of ceramic bearings, rear tapered roller bearing, drawbar assembly including springs, gripper fingers, drive dogs, o-rings, and assembly screws.
RESULT
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.
Spindle contamination is a critical issue that can significantly impact the performance and longevity of your machinery.
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