Chiron DZ 18 W Spindle Repair

The Chiron DZ 18 W is a CNC vertical machining center.  It comes fitted with a grease lubricated and coupling driven spindle capable of running up to 10,500 rpm.

CHALLENGE

This Chiron DZ 18 W spindle arrived at Northland Tool and Electronics as just a shaft, bearings, and drawbar assembly.  The first thing we noted was that the bearings were locked up on the shaft incoming.  Upon inspection, it was found that the OD of the rear bearing races were heavily fretted, customer should inspect the housing bore.  The front bearings suffered a catastrophic failure, the cages were broken.  The gripper fingers (collet) have significant wear on the tool retention surfaces as well.  The front splash ring was severely damaged and two screws were broken off in the face of the shaft.  Lastly, the tooling taper ID had damage at the large diameter as well as several gouges.

SOLUTION

The following actions were performed on this Chiron DZ 18 W spindle:

• Clean, inspect overall dimensions
• Grind, chrome plate, and finish grind the tooling taper ID
• Replace bearings, bellevilles, grippers, o-rings, and assembly screws

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.