If a part measures 3.0020 inches instead of the required 3.0000 O.D., how should you adjust the finishing tool offset?

To achieve the desired outer diameter (O.D.) of 3.0000 inches rather than the measured 3.0020 inches, an adjustment must be made to the finishing tool offset. Since the part is measuring larger than the desired specification by 0.002 inches, it indicates that the tool is cutting wider than needed.

When you decrease the tool offset in the CNC programming, you effectively move the tool inwards (towards the workpiece), which compensates for the excess material that was removed, thus allowing the final part diameter to decrease. In this scenario, to achieve the accurate measurement, the finishing tool offset should be decreased by 0.002 inches, which will reduce the size of the cut made by the tool.

This adjustment will help ensure that the part comes out with the precise measurement required, thus maintaining the integrity and specifications of the job.