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 MoreVoumard VMX-7.5 Spindle Repair
Our customer started having poor part finish while grinding with this spindle. The first signs of trouble were part chatter that eventually turned into parts being out of specifications dimensionally. The pilot for the tooling interface had worn over time allowing movement of the quill and grinding stone.
CHALLENGE
This Voumard VMX-7.5 spindle felt rough when spun by hand incoming. The run out on the pilot was 2 face/4 pilot.
The customer supplied quill measured 32mm -3/-15t plane 1, -4/-15t plane 2 (-15 is just in front of the thread’s). Lastly the shaft pilot measured 32mm +7/+20t plane 1, +7/+20t plane 2 (+20 is at the mouth of pilot). The customer requested a new power cord be put on as well.
SOLUTION
The following actions were performed on this Voumard VMX-7.5 spindle:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and power cord
- Grind, chrome plate, and finish grind the shaft pilot
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.
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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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