US Patent 11913293 Slip wear detection

A system for conducting a subterranean operation can include a retention feature in a drill floor with the retention feature configured to suspend a tubular string from the drill floor via engagement of the retention feature with the tubular string, an imaging system configured to capture images of a visible feature on a portion of the tubular string that extends above the drill floor; and a processor configured to detect a change in a position of the visible feature while the tubular string is engaged with the retention feature, and the processor being configured to calculate a wear status of the retention feature based upon the change in the position of the tubular string.