Abstract: The fiber cutting device of the present invention comprises a die block having a feed opening extending therethrough for receiving a multi-strand fiber. The die block has a flat cutting surface at one end of the feed opening. A fiber feeder is adapted to feed the fiber through the feed opening toward the cutting surface. A rotatable cutting blade is mounted to rotate about an axis approximately parallel to the longitudinal axis of the feed opening, and the blade has a cutting edge adapted to pass in sliding frictional engagement with the cutting surface of the die block once during each revolution of the cutting blade so as to cooperate with the cutting surface to cut the fiber exiting from the feed opening. Adjustable controls are provided for adjusting the speed at which the feeder feeds the fiber through the feed opening, and additional adjustable controls are provided for adjusting the rotational speed of the cutting blade.