Wrong dimensions between model space and layout

[Anonymous]

Hello,

I'm facing an issue with dimensions in the layout space. I've drawn a line of 100mm in lenght in the model space and I used Linear dimension on it, the lenght is good with 100mm. Now, in the layout space, I create a viewport with a scale of 1:1, my line is displayed with the dimension of 100mm, then, I use again the linear dimension and I get a dimension of 99.77mm. 

I checked the viewport settings, dimension properties, and nothing seems wrong.

Any ideas ?

Thank you !

[pendean]

Is your viewport set to a scale?
Are you snapping to the endpoints of that line with both dimensions?
DIMASSOC variable, what is it set to?

[beyoungjr]

Just post the drawing and we will see what's wrong.

[Anonymous]

Thank you for your answers Dean and blyoung,

This is the property panel from the viewport:

I selected the snap mode "Endpoint" to avoid any error when creating the dimension.

The DIMASSOC variable is set to "2"

I attached the dwg to this post.

[pendean]

Increase DIMRND variable to more than two decimal points accuracy (I set it to 1/10000) and your modelspace dimension will match your paperspace dimension of 99.77

Your line is not exactly 100 long.

[sthompson1021 · Accepted solution]

Click into MS and change your view from custom to top and then reset your VP scale to 1:5 and the dimension is right.

[jackshield]

GOOD CATCH!

[Anonymous]

Thanks sthompson1021, problem solved !

And thank you all for your help !