calculate actual diameter of steel coill at unwinder

[dingomex3]

Hello guys, I am trying with diferents ways for compute the actual diameter of steel strip that is unwinding and winding. I see there are many methods and actually I'm using a method that use an integrator function for angle velocity but I don't know what gain setting at integrator function. I'm using a CLX,

 

[shooter]

what is your input?

 

[dingomex3]

my input is angular velocity in rad/s

 

[dingomex3]

for compute the actual unwinding diameter I'm using this equation:
R(t)=Rfull initial-integral of angular velocity multiplied by thickness strip divided between 2pi, after all multiplied by 2, because I want diameter and this is a formula for compute Radius