Elbow making machine, also called round elbow locker machine. it is the special equipment for both connecting lock and seaming when processing on metal plate round pipe and round elbow. By adjusting the position of pointer on the hand wheel, two locks will be formed separately at the mouth of the round pipe then connect the mouth of the pipe for two locks on the other set of the roller to form an elbow. Featured with durable structure, high performance and efficiency and easy-operation, this elbow making machine can form accurate dimension and right angle, and this type of lock is more air-tight with better seam. Good quality forming and seaming are achieved by one machine and space is saved.