Comparing the efficiency of drum and disc chippers - Silva FennicaTests were conducted on two commercial chipper models, a disc and a drum chipper . pers, drum chippers and cone-screw chippers (Pottie and Guimier 1985).conical screw spiral chippers,chipper knife screw removal - Patriot Products IncIf you install and remove enough chipper knives, or if you are really unfortunate it only takes one . ½" wrench to remove chipper cone . 2 spiral screw extractor.
conical screw spiral chippers