The second consideration is spindle wear. If the roll form tooling has been run without keys in it, the bores of the roll tooling may be worn more than the specifications allow, which means the bores must be replaced or reconditioned. (Keys are the square pieces of cold-rolled steel that are inserted into the keyways of the roll tooling and the spindles to prevent the roll tooling from spinning on the spindles.) If the bores are overworn because they were allowed to spin on the spindle of the roll former, they will have to be ground, then hard-chromed, and ground again to achieve the precision fit required between the bore on the roll tooling and the spindles on the roll former.
