The Issue

You may have encountered a bit of a mystery error in Autodesk Inventor CAM when using the 2D Milling Thread or Circular strategies. This only happens when selecting an external face of a cylinder as geometry for one of these toolpaths.

The same setup that will work on an internal hole face will give the error Warning: Selected Face not in Job Model Selection!

The Workaround

The only way to get around this error is to edit the cylindrical geometry and give it the slightest taper.

If the cylinder was created with an extrusion a taper value of 0.000001 degrees is enough to correct the error. If the geometry was revolved the sketch will need to be edited to create a slight taper.

This then allows you to generate the toolpaths again and it will work.

The Conclusion

Although this is not the optimal solution especially in high precision environments, it will keep the machines running for now.

This issue has been logged under the case CAM-14593 and hopefully it will be fixed in the next Inventor CAM update, so please hold tight!