Kia KV40A Spindle Repair

The Kia KV40A is an older CNC vertical machining center.  It comes fitted with a grease lubricated and belt driven spindle capable of running up to 6,000 rpm.

CHALLENGE

This customer called us because his Kia KV40A spindle was making too much noise when they were running it slow at 1,000 RPM. The drawbar had been replaced previously as well.
We picked the spindle up at the customer’s location near our facility and brought it back to our facility where we thoroughly cleaned and inspected the spindle. We determined that there was a front bearing failure from them reaching the end of their expected life.  The taper and gripper fingers were also worn.  No other dimensional deviations were noted for this repair.

SOLUTION

The following actions were performed on this Kia KV40A spindle:

• Clean all parts of the spindle
• Replace bearings, o-rings, and assembly screws
• Replace gripper fingers
• Kiss grind the taper

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.