Cnc intro
- 1. CNC TURNING AND MILLING
- 5. CNC (Computer Numerical Control) is the general term used for a system which controls the functions of a machine tool using coded instructions processed by a compute. Example CNC Manufacturing Process. 1) A part program is written, using G and M codes. This describes the sequence of operations that the machine must perform in order to manufacture the component. This program can be produced off- line, ie, away from the machine, either manually or with the aid of a CAD/CAM system. 2) The part program is loaded into the machines computer, called the controller. At this stage, the program can still be edited or simulated using the machine controller keypad/input device. 3) The machine controller processes the part program and sends signals to the machine components directing the machine through the required sequence of operations necessary to manufacture the component
- 38. The Tool or Material Moves. Tools Can operate in 1-5 axis. Larger Machines have a MCU(Machine Control Unit) Which Manage operations. Movement is controlled by a motors.(Actuators). Feedback is provided by Sensors(Transducers). Tool Magazines are used to change Tools Automatically.
- 39. FANUC CONTROL SIEMENS GSK MECH3
- 40. MDI:Manual Data Input. Program preparation with CAD/CAM. Program Data Transfer From PC to CNC M/c.
- 42. The Main Program is the controlling program, ie, the program first read, or accessed, when the entire part program sequence is run. This controlling program can then call a number of smaller programs into operation. These smaller programs, called Sub Programs, are generally used to perform repeat tasks, before returning control back to the main program. Main Programs are written using I.S.O. address codes listed below
- 45. A program which contains fixed sequences or frequently repeated patterns may be entered into memory as a Sub Program, in order to simplify the main program. A sub program is entered into the machine controller memory in Edit Mode, in the same manner as the main program. Differences between a sub and main program : 1) A sub program does not have a billet size definition at the top of the program listing. 2) A sub program is ended by the M99 code.
- 46. When the main program calls one sub program into operation, the process is called a one-loop sub program call. It is possible to program a maximum four loop sub program call within the main program.