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 MoreGrosite 383000 Spindle Repair
This Grosite 383000 spindle is out of a K.O. Lee surface grinder. It is a pulley driven and grease lubricated spindle capable of running up to 7,200 rpm.
CHALLENGE
When we disassembled this spindle from our customer’s K.O. Lee surface grinder we found light contamination inside, but the spindle failed simply because the permanent bearing grease had dried up after years of service. Similarly, the wheel hub OD taper was worn with >12µ of runout, and the hub retention threads were very tired as well.
SOLUTION
To alleviate the excessive runout, we performed a kiss grind of the wheel hub OD taper in-house on one of our Kellenberger grinding machines. We also freshened up the hub retention threads in our machine shop. We then reassembled the spindle with all new bearings & 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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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.
It’s a fact of machining — eventually, even top-of-the-line turning machines will experience a spindle failure. Spindles endure tension, torsion, heavy loads, and speeds up to and beyond 150,000 RPM, to name a few of the standard stressors.
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