Unknown Manufacturer indexers are typically mechanical or cam‑driven positioning units used to rotate workpieces or tooling in CNC and milling operations. Common failure modes include worn cam profiles, misaligned indexing gears, broken spring plungers, and electrical drive faults such as motor winding shorts or controller board failures. Begin diagnostics by verifying the power supply voltage and inspecting the drive motor for overheating or unusual vibration; check all mechanical linkages for wear or binding, and review any error codes from the control panel. If a motor is present, test its resistance against spec and ensure the cam or gear train is properly lubricated and aligned before proceeding to component replacement.[oss-gpt-20b]