Import scale is wrong

  • Go to Options (Document Properties) >Units
  • Change the units from millimeters to meters and OK.
  • When the “Do you want to scale…?” question pops up, answer No.
  • Your 22 mm will now be 22 meters.

When you use Import, Rhino keeps the units that were set in the current file (in your case millimeters). So your .dwg file numbers were interpreted as millimeters, not meters.

If you use Open instead of Import, Rhino will try to figure out the correct units from the .dwg file, so it might open directly in meters (doesn’t always work though).

If you know the dwg to be imported is in meters, open a meters template first, then use Import.