Center holes on roll journals often take a beating during the installation process in a mill. Depending on the repair process, refurbished rolls can end up with journals that are misaligned with the center holes, making future repairs problematic.

Finding the true centerline on a roll with a damaged or misaligned center hole can be difficult and time-consuming. The Live Chuck Mandrel from Riten Industries Inc. solves this problem by chucking on the bearing journals of the part. The design features a "quick-true" system, which makes it easy to locate the roll on the machine's centerline through simple touch-off indication. Compared with live center-supported rolls, users report improved part quality and throughput increases up to 25 percent, according to the company. Typical models feature an extra heavy-duty bearing assembly coupled with either a 3-jaw scroll chuck or a 4-jaw independent chuck. Standard Morse tapers and chuck sizes from 6" to 18" are available. Other configurations can be custom engineered for unique applications.