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- CNC redirects here. For other uses, see CNC (disambiguation).
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Parametric programming
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. 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.
Because of these features, a parametric program is more efficient than using CAD/CAM software for large part runs. The brevity of the program allows the CNC programmer to rapidly make performance adjustments to looped commands, and tailor the program to the machine it is running on. Tool wear, breakage, and other system parameters can be accessed and changed directly in the program, allowing extensions and modifications to the functionality of a machine beyond what a manufacturer envisioned.
Tools with CNC variants
- Drills
- EDMs
- Lathes
- Milling machines
- Wood routers
- Sheet metal works(Turret Punch)
- Wire bending machines
- Hot-wire foam cutters
- Plasma cuttings
- Water jet cutters
- Laser cutting
- Oxy-fuel
- Surface grinders
- Cylindrical grinders
See also
- Computer-aided design (CAD)
- Computer-aided engineering (CAE)
- Computer-aided manufacturing (CAM)
- G-code
- STEP-NC
- Numerical control
- Machine tool
- Tooling University (offers online CNC training classes)
- Coordinate-measuring machine (CMM)
- Robert C. Byrd Institute CNC training and education.
- Direct Numerical Control DNC
- Configurable Network Computing JDEdwards CNC Administrator
- intelitek Developers of Educational CNC systems
- F1 In Schools F1 in Schools Technology Challenge
- Design_for_Manufacturability_for_CNC_machining
- Multi Spindle CnC Machines
References
External links
- The Enhanced Machine Controller, opensource CNC control software
- MyNC Numerical Control System, opensource CNC software