What is the purpose of using a tool offset in CNC milling?

Using a tool offset in CNC milling is essential for correcting the tool's position relative to the workpiece. This adjustment is necessary because the actual length and diameter of the tools used in machining may not exactly match the predefined dimensions. By applying a tool offset, the CNC machine can accurately account for these discrepancies, ensuring that the machining operations—such as milling, drilling, or contouring—are performed at the correct locations and depths on the workpiece.

This precision is crucial for achieving tight tolerances and a high-quality finish in the final product, which is a fundamental requirement in manufacturing. Proper management of tool offsets also allows for efficient tool changes and minimizes the risk of tool colliding with the workpiece, leading to successful machining operations without damaging the tool or the workpiece.