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 MoreDoosan NHP4000 Spindle Repair
The Doosan NHP4000 is a CNC horizontal machining center. It can come fitted with this oil lubricated big plus 40 taper spindle that is capable of running up to 14,000RPM.
CHALLENGE
Our customer sent in this Doosan NHP4000 spindle stating that the spindle had been crashed. Once the spindle arrived at Northland Tool we completed a full disassembly and evaluation.
This is what we found:
- Spindle rotated freely and the bearings felt okay when spun by hand
- ID Big Plus 40 taper suffered severe damage from a crash or an improper tool grab (Pic 1)
- Drive dogs were worn and needed to be replaced
- The grippers were heavily worn and needed to be replaced (Pic 2)
SOLUTION
The following actions were performed on this Doosan NHP4000 spindle:
- Clean, inspect overall dimensions
- Replace bolts, o-rings, bearings, grippers, bellevilles, and drive dogs
- Grind – Plate – Grind ID Big Plus 40 taper due to heavy damage
RESULT
After reassembly of all components and adjusting bearing preload this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.
DETAILED CAUSE OF FAILURE
Does your spindle need repair? GET A QUOTE TODAY
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.
Read More