22-06-2012, 05:15 PM
Computer Aided Manufacturing Lab
Computer Aided Manufacturing Lab.ppt (Size: 1.74 MB / Downloads: 66)
Numerical control
NC has been defined by the Electronic Industries Association (EIA) as” a system in which actions are controlled by the direct insertion of numerical data at some points. The system must automatically interpret at least some portion of this data”
Components of a CNC machine
In general there are three basic components of an operational NC
1. Programme of instruction.
2. A machine control unit.
3. Machine tool.
Numerical control (NC) - machine can be controlled electronically
Computer Numerically Controlled (CNC) - machine actually has its own microprocessor and memory
Direct Numerical Control (DNC) - wired to a central computer
Need for CNC
Computer Numerical Control (CNC) - A numerical control system in which the data handling, control sequences, and response to input is determined by an on-board computer system at the machine tool.
To manufacture complex curved geometries in 2D or 3D using controlled cutter motions
Machining components with repeatable accuracy
Unmanned machining operations
Advantages
Increased Program storage capability at the machine tool
Program editing at the machine tool
Control systems upgrades possible
Option -resident CAM system at machine tool
Tool path verification.