Feeler HV-1000 Spindle Repair

The Feeler HV-1000 is a high performance CNC vertical machining center.  It can come fitted with this oil mist lubricated and coupling driven spindle that is capable of running up to 15,000RPM.

CHALLENGE

Our customer sent in this Feeler HV-1000 spindle stating that the spindle failed.  Once the spindle arrived at Northland Tool we completed a full disassembly and evaluation.

This is what we found:

• Spindle rotated freely but the bearings felt severly worn
• Actuator piston made heavy contact with the tail of the shaft and caused rub out and heat damage (Pic 2)
• The ID of the tail shaft was egged due to heat damage.
• Rear bearings catastrophically failed due to extreme heat and caused damage to the bearing spacers (Pic 1)
• ID 40 taper contact was bell mouthed
• The gripper fingers were worn from use
• Rear of draw bar suffered from heat damage and had high run out

SOLUTION

The following actions were performed on this Feeler HV-1000 spindle:

• Replace Bolts, O-rings, Bearings, Gripper fingers, Belleville’s and seals
• Grind-Plate-Grind (GPG) ID 40 taper due to bell mouthed contact
• GPG 65mm tail of spindle due to heat and rub out damage
• GPG ID of actuator piston due to heat and rub out damage
• GPG 45mm Rear ID Pilot due to egging from extreme heat
• GPG 12mm tail end of draw bar
• Fix damaged spacers in machining

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.