Any 2D drawing or 3D CAD model must be specifed in some units, say Inches or Millimeters, In this article we shall see more about Autodesk Inventor 2010 Units
Autodesk Inventor, by default during installation takes Inches as its default units, untill you specify the units of your choice say Millimeters.
Note: Every part, assembly, and drawing has a default units system. Values that you enter in dialog boxes are assumed to be in the default units unless you specify a unit name.
When creating a new file, default units are set. However, you can change the units at any time you want.
When you create a part or assembly, the units of measurement in the template sets the default units of measurement for the model. You can change the default units for the active document.
- Click on tools Tab > Option Panel > Document Settings to open the dialog box.
- Click the Units tab to open it.
To change the setting for any of the measurement types or precision, click the arrow next to the edit box. Select the setting from the list.
After you made the necessary changes, click on Apply.
You can also select a unit when starting a drawing by choosing from the template file which contain English and Metric units, see figure below
