![]() The second method of loading a program into a CNC's memory is to connect the controller to a computer or a network that contains a previously written program. Failure to save the final program could be the source of some unnecessary and expensive headaches later. The operator must remember to update the original source code to incorporate all of the debugged or modified program statements. (In effect the CNC machine is being used as a very expensive data-entry terminal.) A much more cost effective method of programming is to use one of the other off-line programming methods (see below) to generate the program, transfer the program into the controller and make only minor changes to the program during debugging or set up (e.g., inputting TLOs). Obviously, the CNC machine cannot be machining workpieces while a programmer is keying in the program. The problem with this method is that it ties up a multithousand dollar controller and machine tool while the program is being keyed in one command at a time. The first method is by keying in the program directly into the controller through the controller's keyboard. ![]() If the controller is a later model with its own built-in memory (a CNC type of N/C machine), the program can usually be loaded into the controller by one of three methods. The method used to load an N/C program into a controller depends on whether the controller is one of the later models that has its own memory into which the entire program can be loaded, or whether it is one of the earlier models that must read an encoded paper or magnetic tape and execute the commands one block at a time. ![]() Numerical Control Programming - Chapter 4 Numerical Control Programming ![]()
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