Four-head corner combining machine CNC for Aluminum Door and Window LM4-CNC-100*1800*3000 1). The machine is used for combine the aluminum windows and doors corner. 2). The 45 degree corner is jointed by steel corner connectors. 3). It can finished a whole rectangle frame combination at one time. 4). The whole combination procedure CNC controlled, features high automatization. 5). The four head moving system adopt linear bearing, which features high precision, high resistance. 6). The machine can combine both the common aluminum profiles and also the thermal breaking aluminum profiles.