calculate actual diameter of steel coill at unwinder

[robert_ 1]

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,

[mikey431 3]

are you talking a gain function to using in the PID loop control ?

[JRoss 84]

I did something like this for taper control on a paper rewind, but I seem to remember that I just used the number of rotations of the cylinder, the thickness of the paper, and the diameter of the core to calculate diameter.

[chantecler 15]

Generally you calculate the radius dividing the line speed by the angular speed being careful to avoid calculations when speed is very close to zero

[Joe E. 259]

We have a winder application that uses an ultrasonic distance sensor to measure the size of the coil so it can calculate the torque needed to maintain the correct tension on the strip that it's pulling.