I have a DWG drawing that was drawn at a scale of 1" = 20', and when imported into Chief Architect it is the wrong size. How can I change the scale so it displays at the correct size?
In Chief Architect, all architectural and CAD drawings in plan files are drawn at a one to one scale. A 24" X 24" cabinet really is 24" square, and a CAD line 8" long really is that length - regardless of how far you zoom in or out. To produce a scaled working drawing, the desired scale is specified when a view is sent to layout or printed.
Since drawings are not scaled in the Chief Architect drawing window, it is not possible to assign a scale to an imported drawing. If you have a DXF or DWG drawing that was not drawn at 1:1, it needs to be imported using a custom unit of measurement that takes the drawing's scale into account and converts it to a 1:1 drawing.
To create a custom unit conversion
Open the Chief Architect plan in which you would like to import a DXF or DWG drawing and select Edit> Preferences from the menu if you're on a Windows PC or Chief Architect> Preferences if you're on a Mac.
On the Unit Conversions panel of the Preferences dialog, click the Add button.
In the Add Unit Conversion dialog that appears next:
Type a short, descriptive name for your custom unit in the Unit Name field.
Select a Measurement Type of length.
In the Multiply by field, type the scaling factor that the drawing is using. In this example, 20 is used.
In the to Convert to drop-down list, change the unit of measurement to the unit you want to convert to. In this example we are converting to feet so ft is selected from the drop-down.
Click OK to close the dialog and add your custom conversion to the Units list.
There are several ways to do a unit conversion. For example, a scale of 1" = 20' can be re-scaled by multiplying by 20 and converting to feet. Or, it can be multiplied by 240 (12" X 20) and converted to inches.
Click OK to close the dialog and accept your changes.
To import a DXF or DWG file using a custom unit of measurement
Select CAD> CAD Detail Management from the menu and open a new CAD Detail window to import your drawing into.
Select File> Import> Import Drawing from the menu.
Follow the steps in the Import Drawing Assistant until you get to the Drawing Unit screen and select your new unit conversion from the drop-down.
Click the Next button and finish importing the drawing. You can use the dimension tools to verify that the drawing is not at the correct scale.