To set the working units:

Click on the SolidCAM field in the Autodesk Inventor menu and choose CAM Settings.

The SolidCAM Settings dialog box is displayed.

Click on the Units item in the list to activate the Units page. The Units page is displayed.

Make sure the working units are Metric; if not, click on the Metric button.

SolidCAM will now use millimeters as the working units.