The W. M. Keck Observatory Segment Repair Project is repairing stress-induced cracks at the support points in all of the 84 primary mirror segments. The repair process for each segment involves disassembling hardware, removing bonded attachments, grinding out the damaged glass, etching, bonding new attachments, reassembling , and testing on sky. This also presents an opportunity to inspect and thoroughly clean the supports and segments after almost 25 years of service. The production phase of the project will reach the halfway point of the repairs during the summer of 2018. This paper summarizes some of the issues encountered and anomalies discovered during the repair process and presents on-sky results of the performance of the repaired segments. An update on the project status, schedule, and budget is also presented. Details of the project development to the production phase, and step by step descriptions and photos of the repair process are included.
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