Abstract: The edge-milling machine as used by the JCOE steel pipe plant encounters a problem，i.e. in case of processing thick plate or plate with large margin，its feeding carriage is running unstably，and even crawling，which not only affects the production efficiency，but also easily damages the blade and the equipment as well. The reason for the problem is analyzed，and it is revealed，that due to the existence of the drive clearance，the cutting disc’s pulling force as imposed onto the carriage is similar to the wheel drag，and both are inconsistent to get the speed-control circuit isolating. Accordingly a hydraulic resistance device is designed and installed that applies a resistance as opposite to the movement direction so as to have the said drive clearance eliminated，and thus the crawling problem of the feeding carriage is fixed.