4340 rolls

[HUPE]

Hi,

I have a set of corrugator rolls to make waves on pool walls. My rolls are about 8" dia x 60" long. The rolls flex in the middle. (0.006") Is it a normal situation? I have others of 52" and .200" bigger on diameter and they flex less. Could it be the difference or something is wrong with my rolls?

 

[Philrock]

The shorter rolls are almost 70% stiffer, plus they see less load due to their shorter length.

 

[griffengm]

Hupe,
Philrock is correct. I think this is why some roll makers design in a small increase in roll diameter toward the center of the length. It offsets some of the deflection and adds s bit of stiffness. You might check with the manufacturer as to whether this is the case with your setup.