The Lockformer Skip Dent indexing Roll is the heart of this system. The indexer is the first roll and has four pins and two milled ridges. The control lever determines whether the blank is hemmed after the first or second notch. With the lever in the position 1, as the blank engages the indexing roll, a pin drops into the first notch. A ridge adjacent to the pin prebend the material at its corner just enough to force the material into the hem forming rolls where the 180-degree hem is formed. The next pin, on the rotating index roll, drops in the second notch and since there is no ridge present, the corner of the blank is not turned down and misses the hemming rolls and this section remains unformed. This rollformer is for the shop or plant producing large quantities of ductwork where labor costs need to be at their lowest or production needs to be high. This machine is 10 times faster than any powered cleatbender. Call us for additional photos or information.