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 MoreHeald Red Head 273A Spindle Repair
This Heald Red Head 273A grinding spindle comes grease lubricated and belt driven. These give it the capability to run up to 8,200 rpm.
CHALLENGE
When this Heald Red Head 273A spindle arrived at our facility the first thing we noted was that the spindle was noisy when spun by hand. After disassembly, we found that there was light contamination throughout all of the bearings. We measure the critical dimensions (bearing journals, housing, taper, etc.) and found a couple issues. The pilot and face both had high runout and the pilot was oversized well out of heald specifications. (spec is 1.3746/1.3748″ Pilot measures 1.3767″) No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Heald Red Head 273A spindle:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and assembly screws
- Grind, chrome plate, and finish grind the 1.375″ ID pilot
- Kiss grind the pilot face
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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