Rotary knives are often used in industry to cut a continuously-fed web into desired lengths. Modern rotary knives are often servo-driven. Several controller manufacturers offer configurable software for controlling a rotary knife, but few offer a tool geared to sizing a servo for a given rotary knife application. Check out this recent article from Sixto Moralez and Phil Drexler of Yaskawa in Control Engineering for an overview of the knife cycle and what you need to calculate before you size out a servo system.
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