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Tuesday, February 26, 2008

INTRODUCTION TO CNC



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, CNC does numerically directed interpolation of a cutting tool in the work envelope of a machine.

Numerical control (NC) is the original term given to this technology and today is still used by many interchangeably with CNC. NC technology has been one of manufacturing's major development in the past fifty years, it has not only resulted in the development of new techniques and the achievement of higher production levels but also has helped to improve product quality and stabilize manufacturing costs.

CNC uses numerical data to control a machine tool. The instructions needed to machine a workpiece include feed, speed, depth of cut, and all the necessary tool motions.This set of instructions is known as a part program.

A micro computer known as a machine control unit (MCU) reads and executes the machining instructions coded in the part program.

The CNC can store multiple programs. This lets an operator create or run different parts by calling up and executing different part programs.

Really they're basically five elements to a CNC Project that you need to know:

Design - thinking and planning what you want to build
CAD - translating it into the computer
CAM - converting it into machine language
Controlling - directing your machine's motion
Machining - building the part to specifications