What is the main purpose of adjusting tool offset in CNC milling?

Adjusting tool offset in CNC milling primarily serves the purpose of compensating for the dimensions of the cutter, ensuring that the machining process produces parts that conform to precise specifications. When a tool is used, variations in its size, wear, or the exact point of contact with the material can lead to discrepancies in the finished part's measurements. By adjusting the tool offset, the machine can account for these factors.

This adjustment is essential for achieving the intended depth of cut, maintaining tolerances, and ensuring that the final dimensions of the workpiece are accurate. It allows the operator to fine-tune the position of the tool relative to the workpiece without physically altering the tool or setup. Proper tool offset adjustments are crucial for minimizing scrap rates and maintaining production quality.