Beijing Starfire Control Technology Co.,Ltd.
北京斯达峰控制技术有限公司
Model SF-2012AH-QG
Cutting Machine
（
C002
）
8
Chapter VI. Command System
6.1. 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.
6.2. Coordinate System
This CNC system uses standard rectangular coordinate system, as shown in the figure below.
+X
+Y
O
Fig. 6.1 Rectangular coordinate system
