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 MoreBoneham GS7433 Spindle Repair
This Boneham GS7433 spindle is grease lubricated and pulley driven making it capable of speeds up to 10,000 rpm.
CHALLENGE
Upon inspection of this Boneham GS7433 spindle it was found that the grease in the rear bearings was discolored, indicating severe contamination. The customer requested the installation of a front air purge & kiss grind of the hub taper. We found that the hub taper had rubout damage from a spinning hub, therefore the gap was too low to kiss grind and will need GPG. We also noted that the front housing ID was egged & tapered +5/-10µ (ISO is ±6.5µ).
SOLUTION
The following actions were performed on this Boneham GS7433 spindle:
- Clean, inspect overall dimensions.
- Machine 10/32” threaded air purge inlet hole in nose of spindle housing, install 1/8” x 10/32” push connect fitting.
- Create air purge path in front housing nut & cover.
- Grind, chrome plate & finish grind hub taper & front housing ID.
- Replace bearings & Listo seal.
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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