G20 CODE

G20 CODE FOR CNC MILLING WITH FANUC CONTROLLER

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THE G20 CODE IS BASICALLY USED TO DECLARE INCHES DIMENSIONS IN PROGRAM.

IN THE CNC MACHINES WE USE TWO TYPES OF DIMENSIONS:-

• PROGRAM DIMENSIONS ARE IN INCHES.
• PROGRAM DIMENSIONS ARE IN MILLIMETERS.

SO, IN THE SEVERAL COUNTRIES BOTH G20 AND G21 CODE IS COMMONLY USED. IN WHICH G20 IS TO DEFINE DIMENSIONS IN INCHES OR G21 CODE IS TO DEFINE DIMENSIONS IN MILLIMETERS. SOMEWHERE LIKE AUSTRALIA OR ANY OTHER COUNTRIES USE ONLY INCHES DIMENSIONS. SO AT THAT TYPE OF COUNTRIES, G20 IS COMMONLY USED.

Also, See G02 Code Example(click here)

MINIMUM INCREMENT IN INCHES:-  

USUALLY, NOBODY GIVE ATTENTION ON INCREMENTAL POSITION OF THE WORKPIECE. THE USUAL MINIMUM INCREMENTAL IN INCHES IS ONE TEN- THOUSAND OF ONE INCH (0.0001). 

G81 Code Example(click here)

EXAMPLE:-

SO HERE THE EXAMPLE FOR THE G20 CODE. WHERE THE DIMENSIONS ARE USED IN INCHES. NOW EVERY DIMENSION ARE USED IN THIS PROGRAM IS IN INCHES.

G17G20G54G90;

M06T01;

M08;

M03S1000;

G00X0Y0Z0F10;

G01Z-5;

X7.125Y5.625;

G01Z10;

G28Z0;

M05;

M09;

M30;

Drawings for CAM (click here..!!)