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 DNM500HS Spindle Repair
The Doosan DNM500HS is a CNC vertical machining center. It can come fitted with this air/oil lubricated and motor driven spindle that is capable of running up to 15,000 rpm.
CHALLENGE
Our customer sent in this Doosan DNM500HS spindle stating that the spindle is noisy. Once the spindle arrived at Northland Tool we completed a full disassembly and evaluation.
This is what we found:
- There was no encoder sent in with the spindle
- Rear roller bearing feels worn when spun by hand
- ID Taper was visibly worn and had high run out as well as poor contact (Pic 1)
- The grippers were worn and needed to be replaced
- The bellevilles took quite a bit of material off of the draw bar
SOLUTION
The following actions were performed on this Doosan DNM500HS spindle:
- Replace bolts, bearings, o-rings, grippers, and bellevilles
- Grind-Plate-Grind (GPG) ID BP40 taper due to high run out and poor contact
- GPG the draw bar
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
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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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