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11. Command System
11.1. Description of Programing Symbols
In CNC cutting operation, each step is taken according to a program. Each machining program
is composed of several command segments, each command segment is composed of several
function words and each function word is required to be a letter followed by parameter value.
Definitions of Function Words:
N Serial number of command segment
G Preparatory function
M Auxiliary function
T Tool function(refer to as flame width in this system)
L Number of cycles, time delay
X X-axis(diameter) absolute coordinate
Y Y-axis absolute coordinate
I The difference between the coordinate value of circle center and X-axis original value in
arc cutting operation
J The difference between the coordinate value of circle center and Y-axis original value in
arc cutting operation
R To designate arc radius
H To designate arc chordal height
A Auxiliary variable
F To designate machining speed for G01, G02 and G03
Note 1:
The following rules are valid in the definitions below:
X[U]n--- It is allowed to be either X or U and n stand for a value;
同理，
Y[V]n----It is allowed to be either Y or V, and n stand for a value;
PPn----It is allowed to be a combination of any two axes or one axis at least.
Note 2:
In command execution, the previous program has higher priority than the following one; for the
same program, M, S and T command haver higher priority than G command.
11.2. Coordinate System
This CNC system uses standard rectangular coordinate system, as shown in the figure below.
