Whitnon 411-0032-100 Spindle Repair

This Whitnon 411-0032-100 spindle is grease lubricated and pulley driven making it capable of running up to 7,700 RPM.

CHALLENGE

When this Whitnon 411-0032-100 spindle arrived at Northland Tool and Electronics, we noted that the front threads were broken off from the shaft.  After performing a full disassembly, we recorded that all of the bearings showed signs of coolant contamination and had little grease left.

Grease washed out of bearings

A dimensional evaluation was then completed on the spindle were we found that the front bearing shoulder and OD taper had high runout.

SOLUTION

The following actions were performed on this Whitnon 411-0032-100 spindle:

• Clean, inspect overall dimensions
• Replace bearings, bolts, and o-rings
• Manufacture replacement threads and install in shaft
• Grind, plate, grind (GPG) the OD taper
• Kiss grind the front bearing shoulder

RESULT

After reassembly of all components and adjusting bearing preload, we put the spindle through a rigorous break-in and testing procedure to make sure it passes our final quality inspection. See below for the passing test reports:

Front Bearings Vibration Analysis Spectrum:                 Rear Bearings Vibration Analysis Spectrum:

This spindle passed our final quality inspection and was returned to our customer with a 1-year warranty.