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Do you find dimensions are showing incorrect value when you work on AutoCAD layout? There are two system variable that may affected this. Let’s see what they are, and what they do.
If you draw your drawing in 1:1 then you must have DIMLFAC value 1. If you set it to 2, then dimensions that use this dimension style will show value twice than the original.
You can check this value for current dimension style by typing DIMLFAC at command line then press enter.
Or you can check in modify dimension style dialog box, primary units tab.
If you see this value is not 1, you probably receive this file from someone who set their plots in model space. They need to scale the drawing if they have multiple scale in a sheet. To correct dimension value, they need to create several dimension style with different DIMLFAC value.
You have this problem when working with layout, but when you use it for model space it shows correct value. If this is the case, then you also need to check DIMASSOC variable. The default value is 2.
It doesn’t matter the viewport scale, if you have 2 as DIMASSOC value. AutoCAD will recognize the real geometry value.
But if you have it set to 0 or 1, then AutoCAD will show you the value as if you print it and measure the distance on paper.
Working with layout gives many benefits, like we cover here before. However, model space is a way to accomplish the job. Many people consider this as more convenient way.
So if you receive a file and the dimensions don’t show correct value, now you know why!