Pit & Quarry, November 2012
PIT SToP and experienced personnel because unnecessary repairs can lead to additional damage and limited bearing life Common repair mistakes include Improper polishing techniques that cause changes to geometry or profiles that do not correct worn geometry and contact conditions Improper grinding techniques and processes that can cause surface cracks and damage or improper geometry or profiles Preset components mixing Improper profile internal geometry finishes and clearance settings that can cause bearing failure In addition to expertise proper equipment is required to fix the problem and ensure damage has been reviewed and properly removed The appropriate measuring equipment such as laser tracing and profiling equipment coordinate measuring and precise measuring machines are essential to perform thorough inspections on repaired product A quality bearing repair program can result in significant savings compared to discarding and purchasing new bearings In addition the lead time for repair is substantially less than that of a new bearing PQ Jay Alexander is plant manager Timken Industrial Service Center For information on Timkens bearing repair services visit ww timken com bearingrepair The outer race of a large spherical roller bearing after remanufacture which includes the process of removing aggressive surface damage by using a grinding or hard turning process 42 PIT QUARRY November 2012 www pitandquarry com
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