Quite often I get sent a 2D Drawing (DXF or DWG) from a customer and I open it in DraftSight. If I want to determine a dimension that they haven't included on the drawing, I typically just add my own. If the drawing is scaled, I have to multiply the dimension by the scaling factor to get the actual value.
For example, If the scale of the drawing is 1:10, and I measure 200 mm, I know that actually means 2000 mm.
I have been given a drawing that says the scale is 1:12.5, but when I place an identical measurement next to one indicated, it doesn't match. For example, the dimension already on the drawing (in blue) as 2000 mm, actually measures as 156.0000:
Part of the drawing, as sent to me
After adding my own dimension to double-check the scale
However, 2000 divided by 156 is something like 1:12.82051282..... not 1:12.5.
I feel like I am missing something really obvious here in DraftSight as far as how dimensions are made. Or, is it just that the person who made this drawing potentially originally had it at 1:12.5, then resized it a little at some later point, which screwed everything up?
Does anyone else ever have this same problem? If so, what is your workaround?
Thanks in advance,