Ok let me say a few things first:
That being said: so how does this fanuc thing work??
Not much on google, appears you have G code things.....OK....how does the head know how far down to go??
Could I get a simplified explanation ?
Fanuc is a company that makes CNC Controls. A lot of other CNC control manufacturers base their code off of the Fanuc syntax or code format. The first reply to this thread is a link to a nice knowledge base of CNC use and programming and also is centralized around Fanuc programming and use.
G-Code is what you use to control the CNC part of the machine operation. You can either hand write a program or use a CAM software to generate a G-Code program based on toolpaths that you apply to a 2D or 3D model. The program itself is comprised of G-codes, M-codes, and XYZ positions. There are canned cycles, or built in functions, that utilize other values like R, P, Q, etc..
G codes like G20 or G43 control how the rest of the code is interpreted by turning modes on and off or calling up canned cycles for drilling or tapping. These are pretty standardized and work similarly across most Fanuc controls.
M-Codes control machine functions like Spindle on/off or coolant on/off. These can be manufacturer specific, but the most basic ones are usually standardized like spindle and coolant.
XYZ are positions in reference to a known point. If you are in G90(absolute mode), these positions are relative to a work offset. If you are in G91(incremental mode), these positions are relative to the machine's current position. Using one, two, or all 3 XYZ values will give you a straight line unless you command an arc move.
R or IJK codes on a line that has XYZ will define an arc type movement.
Other things to know would be Work offsets and Tool offsets.
Work offsets are used to specify a position for which the G-Code program will run relative to when programming in absolute(G90). This is how most programs are written/generated. You can have multiple work offsets and call them up in your program when you need them. G54 is usually the default. G55-G59 are also available for the same purpose.
Tool offsets are used to specify a length of a tool from the machines gage line. This way you can have multiple tools setup, and change them out and just call up their tool length offset with G43 H??. The machine then compensates for the length variation and will put the tip/end of the tool at the proper height relative to your work offset.
I could give examples for all of the above, but CNC Cookbook is a decent resource and has all that already. So, start reading!
Also, you can experiment with these codes in MDI(Manual Data Input) mode. Just be careful and learn where the reset button and the Emergency stop are. Don't be afraid to hit either the moment you need to. Reset is like a soft stop and cancels a lot of different things like movement and spindle, but not always. Emergency stop cuts the power to the servos and the spindle immediately. Recovering from an E-stop isn't hard, just might take you a minute the first time you do it, but is something you should know. And with most fanucs, just release it and hit reset. Then go into MPG, or Jog if you don't have a pulse handle, and move the machine away slowly. It's probably wise to learn how to manually move the machine around with those modes before you do anything else. This way you can see if anything is making noise or doesn't feel right before you try a program or command.
