K-factor gauge table

Hi all user,

I have troble with k-factor gauge table. I'm using SolidWorks 2012.

For example :

First part : I make part with sheet metal and then using k-factor 0.325. Thickness : 1mm, R : 1.3. The result flatten is 197.95mm

Second part : Same sketch but im using gauge table. The result flatten is 197.97mm.

Why the result flatten different?

Plase give me suggestion in this case.

Thaks for all.

SolidworksSheet Metal