The abbreviation CNC stands for computer numerical control, and refers specifically to a computer "controller" that reads G-code instructions and drives a machine tool, a powered mechanical device typically used to fabricate components by the selective removal of material. CNC does numerically directed interpolation of a cutting tool in the work envelope of a machine. The operating parameters of the CNC can be altered via a software load program.
Punched tape continued to be used as a medium for transferring G-codes into the controller for many decades after 1950, until it was eventually superseded by RS232 cables, floppy disks, and now is commonly tied directly into plant networks. The files containing the G-codes to be interpreted by the controller are usually saved under the .NC extension. Most shops have their own saving format that matches their ISO certification requirements.
The introduction of CNC machines radically changed the manufacturing industry. Curves are as easy to cut as straight lines, complex 3-D structures are relatively easy to produce, and the number of machining steps that required human action have been dramatically reduced.
With the increased automation of manufacturing processes with CNC machining, considerable improvements in consistency and quality have been achieved with no strain on the operator. CNC automation reduced the frequency of errors and provided CNC operators with time to perform additional tasks. CNC automation also allows for more flexibility in the way parts are held in the manufacturing process and the time required to change the machine to produce different components.
Lately, some controllers have implemented the ability follow an arbitrary curve (NURBS), but these efforts have been met with skepticism since, unlike circular arcs, their definitions are not natural and are too complicated to set up by hand, and CAM software can already generate any motion using many short linear segments.
A drilling cycle is used to repeat drilling or tapping operations on a workpiece. The drilling cycle accepts a list of parameters about the operation, such as depth and feed rate. To begin drilling any number of holes to the specifications configured in the cycle, the only input required is a set of coordinates for hole location. The cycle takes care of depth, feed rate, retraction, and other parameters that appear in more complex cycles. After the holes are completed, the machine is given another command to cancel the cycle, and resumes operation.
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.
There are three types of variables used in CNC systems: local variable, common variable, and system variable. Local variable is used to hold data after machine off preset value. Common variable is used to hold data if machine switch off does not erase form data. The System variable this variable used system parameter this cannot use direct to convert the common variable for example tool radius, tool length, and tool height to be measured in millimeters or inches.
Typical logic to a parameter program is as follows;
First define variables to start your program.
-bolt circle radius
-how many holes
-centerpoint of bolt circle
Next build a subprogram that crunches the math.
When you are ready to drill or tap your holes, run the drill cycle
off of your math in subprogram.
T101 (REVOLVER 1 CORRECTION 1 TOOL CALL)
G97 S1000 M3 (SPINDLE SPEED, ROTATION DIRECTION)
offset pickup,etc .....
G43 ..... in some cases (tool length pickup)
#101=10 (HOW MANY HOLES)
#103=0 (CIRCLE-CENTER X)
#104=-10 (CIRCLE-CENTER Y)
G81 ..... (DRILL CYCLE)
GOTO 100 (JUMP TO SUBPROGRAM)
(REUSE THE SUBprogramm)
#100=7.5 (RADIUS ROUND 2)
GOTO 100 (JUMP TO SUBPROGRAM)
G80 (DEACTIVATE MODAL G81)
N100 (THIS LINE HERE IS USES AS A MARKER)
N101 X[COS[#105]*#100+#103] Y[SIN[#105]*#100+#104] (REMEMBER YOUR G81 CODE IS MODAL)
IF [#105 LT 360] GOTO 101 (IF #105 < 360 -> NEXT ROUND)
This is just a model to show the logic of programming.
As all languages have some differences, the logic is all similar.
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