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{{nofootnotes|date=October 2008}}
:'''''CNC''' redirects here. For other uses, see [[CNC (disambiguation)]].''
▲A more recent advancement in CNC interpreters is support of logical commands, known as parametric programming. Parametric programs incorporate both G-code and these logical constructs to create a programming language and syntax similar to [[BASIC]]. Various manufacturers refer to parametric programming in brand-specific ways. For instance, [[Haas Automation]] refers to parametric programs as macros. [[FANUC Robotics|GE Fanuc]] refers to it as Custom Macro A & B, while [[Okuma]] refers to it as User Task 2. The programmer can make if/then/else statements, loops, subprogram calls, perform various arithmetic, and manipulate variables to create a large degree of freedom within one program. An entire product line of different sizes can be programmed using logic and simple math to create and scale an entire range of parts, or create a stock part that can be scaled to any size a customer demands.
Parametric programming also enables custom machining cycles, such as fixture creation and bolt circles. If a user wishes to create additional fixture locations on a work holding device, the machine can be manually guided to the new ___location and the fixture subroutine called. The machine will then drill and form the patterns required to mount additional vises or clamps at that ___location. Parametric programs are also used to shorten long programs with incremental or stepped passes. A loop can be created with variables for step values and other parameters, and in doing so remove a large amount of repetition in the program body.
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