Programming 101: CNC
After World War II, people realized that they have to manufacture goods at a faster rate and at a lower cost. Hence, mass production trending came to be. Those events led to the development of the Numerical Control (NC) machines which in turn led to the Computer Numerical Control (CNC).
HOW TO PROGRAM A CNC MACHINE
CNC programming uses a code similar in structure to BASIC. So, if you know how to construct a simple counting program, chances are, you already know what a G-Code looks like. However, there a few other things you have to consider before you start encoding instructions.
The first thing that you have to do is to assign values for each of the variables. These variables include the programmable motion directions (axes), and the reference point for the axes. The values that you assign to these variables dictate the movement of the machine.
The next thing that you have to do is to take into account the accessories of the machine. Many machines have accessories that are designed to enhance the capabilities of the basic device. However, using these accessories requires you to include them in the coding system. This means that if you want a more efficient machine, you will have to know the machine inside out.
READING CODES
After those steps, you have to create a subprogram that will deal with the math. This step will then allow your machine to compute the necessary variables and effectively operate without stopping to ask the operator what the limitations are.
To show you what these codes look like, here’s an example from Wikipedia:
#100=3 (bolt circle radius)
#101=10 (how many holes)
#102=0 (x position of ctr of bolthole)
#103=0 (y position of ctr of bolthole)
#104=0 (angle of first hole
Tool call,
spindle speed,and offset pickup,etc
G43 in some cases (tool length pickup)
G81(drill cycle)
call sub program
N50
G80
M30
Subprogram
N100
#105=((COS#104)*#100) (x location)
#106=((SIN#104)*#100) (y location)
x#105 y#106 (remember your G81 code is modal)
If #100 GT 360 goto N50
#100=(#100+(360/#101))
Goto 100
In the code above, the machine is a drill. The operator utilized a loop in order to keep the machine from stopping. The subprogram then governs the cycle of the machine. This code is still quite a simple code. Other machines require the inclusion of the maximum RPM in the coding.
An easier way of programming CNC machines would be the use of Computer Aided Manufacturing (CAM). This system takes on the brunt of programming so that it doesn’t seem so tedious and frustrating. It is still similar to BASIC.
Another programming enhancement that was developed was the parametric programs or the logical commands. These programs were designed to shorten lengthy codes in order to make them user friendly. However, these codes do not always use the same language with every machine. The language and sequence often varies depending on the typ of machine you will be working on.
The operator has to know what the machine can do or what it was made to do before attempting to program it. You should be able to visualize the machine doing what you want it to do.
But, you don’t have to be a math wizard or a programming genius. You just have to know what your machine does and what you want it to do.
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The Publisher has strived to be as accurate and complete as possible in the creation of this website, notwithstanding the fact that he does not warrant or represent at any time that the contents within are accurate due to the rapidly changing nature of the Internet.
This site is a common sense guide to Programming 101: CNC. In practical advice websites, like anything else in life, there are no guarantees of income made. Readers are cautioned to reply on their own judgment about their individual circumstances to act accordingly.
This site is not intended for use as a source of legal, business, accounting or financial advice. All readers are advised to seek services of competent professionals in legal, business, accounting, and finance field.
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The CNC Family
When To Shove People Out To Make Way For CNC
CNC Machine Setup and Operation
Pad Printing with CNC
CAM: A Vital Component of CNC
In Depth Discussion In Planning CNC Programs
Motion Control - The Heart of CNC
Cycle Time Reduction Principles for CNC Machining Equipment
Meet Your "Other" Employees: The Basic Parts of a CNC Machine
Practical Applications of CNC
The Different CNC Machines
Weighing Technology's Offers: The Pros and Cons of a CNC Job
People You Will Need When You Already Have A CNC Machine
3 Basic Motion Types in a CNC Machine
Understanding CNC
What It Takes to be a CNC Operator
Industries That Constantly Define CNC Precision
My Bestfriend's Name Is CNC: A Company’s Perspective
Programming 101: CNC
How CNC Helps Companies
Pros and Cons in Sheet Metal Manipulation with CNC
Data Transfer Methods of CNC
Programming CNC Machines With G-Codes
CNC Programming Tips the Professional Way
How To Effectively Consider CNC
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