Reason:

If the file being imported is DXF format, the problem maybe the original file and RDWorks have     different units.

For example, the unit of the original DXF file is “inch”, but in RDWorks, the DXF unit is set as “mm”. When you import the DXF graphic to RDWorks, the graphic will be read as “mm” unit. Therefore the size turn out in RDWorks is different from the original size.

Solution: 

In RDWorks:

Go "config(s)">>"Import/Export", set the DXF unit according to needed, please refer to below photo.

Please make sure DXF file unit from your drawing software is the same as RDWorks’ s DXF unit.

End.