Linear parameter length is not the same as the measured length

[martyn_jones9DSJ6]

Hi,

I've created a block to represent a TV screen. The screen width is controlled by a linear parameter and two stretches are used to stretch left  ane right about the centre. I works well but defining the width in the properties for the linear parameter to, say 400 mm is not giving the correct length which is measured as 394 mm. I've read a post sying to use polar parameters as they are absolute and linear are not but this doesn't make sense to me, id thi a basic error on my part or a feature of AutoCAD? Many thanks

[Valentin_CAD]

@martyn_jones9DSJ6 ,

Consider posting in the AutoCAD Dynamic Blocks Forum - Autodesk Community

Notice this point on left side:

[АлексЮстасу]

Hi, @martyn_jones9DSJ6,

You cannot define dimensions via block parameters. The parameters only show the actual dimensions.

[martyn_jones9DSJ6]

Thanks for the Dynamic Blocks Forum link