An indexer is a mechanical or digital device used to rotate a workpiece to predetermined positions, often used in machining and assembly processes. It works by incrementally rotating the workpiece to specific angular positions, allowing for precise, repeatable machining of features around the workpiece. The indexer's primary advantage is its ability to perform accurate indexing in multi-axis machining, increasing the efficiency of production lines and reducing setup times. Indexers are essential for processes like milling, drilling, and grinding, where precise control of part positioning is necessary. They are widely used in industries such as automotive, aerospace, and medical device manufacturing, where high precision and repeatability are crucial. The indexer offers improved productivity and part consistency in both manual and automated environments.