Monday, September 5, 2011

A Code used in CNC Programming

G Code - A Code used in CNC Programming
G-code is the common name for the most widely used numerical control program language. G-codes are also called as preparatory codes, and are any word in a CNC program that begins with the letter. G-code programming environments have evolved in parallel with those of general programming from the earliest environments like writing a program with a pencil or typing it into a tape puncher to the latest environment that stack CAD,CAM and richly featured G-code editors.

Generally it is a code telling the machine tool what type of action to perform, such as:

G-code command
- Rapid Move

- Controlled feed move in a straight line or arc

- Series of controlled feed moves that would result in a hole being bored,a work piece cut(routed) to a specific dimension,or decorative profile shape added to the edge of a work piece

- Set tool information such as offset

G-code began as a limited type of language that lacked constructs such as loops,conditional operators,and programmer-declared variables with natural-word-including names (or the expressions in which to use them).It was thus unable to encode logic;it was essentially just a way to connect the dots where many of the dots locations were figured out longhand by the programmer.The latest implementations of G-code include such constructs,creating a language somewhat closer to a high-level programming language.The more a programmer can tell the machine what end result is desired,and leave the intermediate calculations to the machine,the more s/he uses the machine s computational power to full advantage.

G-code program

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