A lapping tool is a precision instrument used in machining to achieve a smooth and flat surface on a workpiece. It typically consists of a flat plate or disk, often made of metal or glass, that is used in conjunction with an abrasive slurry. The process involves moving the workpiece against the lapping tool in a controlled manner to remove small amounts of material, resulting in a highly polished finish. Lapping is commonly used in various industries, including automotive and aerospace, to ensure tight tolerances and improve the performance of components. This technique is particularly effective for finishing surfaces of optical lenses, engine parts, and mechanical seals, where precision is crucial.