Thick rolled, when large or larger barrel diameter of the workpiece material strength, you should small decrease and the movable roller should be after several roll forming.
When rolling rolls are thick, large diameter barrels or workpieces with a large rife material strength, you should drop the rolling roll in small amounts and roll it multiple times.
When rolling thick and large diameter cylinder or workpieces with high material strength, you should lower the moving roll a little and roll them several times.<br>