Chapter 3 G Commands
77
Ⅰ
Progra
mming
Starting point A
Z
X
Middle point
B
(
X
,
Z
)
The machine 2
nd
reference point R2
Note 1: Execute the machine 2
nd
, 3
rd
, 4
th
reference point return after you manually execute the machine
reference point return or G28 (machine reference point return).
Note 2: A
→
B and B0
→
R2, two axes separately traverse, and so their trails are linear or not.
Note 3: CNC cancels the tool length compensation after you execute G30 to return 2nd, 3rd, and 4th
reference point.
Note 4: Must not execute G30 (machine 2nd, 3rd, 4th reference point return) when the zero switch is not
installed on the machine.
Note 5: Do not set the workpiece coordinate system when you execute the 2nd, 3rd, and the machine 4th
reference point return.
3.14 Skip Interpolation G31
Command format:
G31 X(U)_ Z(W)_ F_;
Command function:
in executing the command, when the outside skip signal (X3.5) is input, the
system stops the command to execute the next block. The function is used
to the dynamic measure (such as milling machine), toolsetting measure
and so on of workpiece measure.
Command explanations:
non-modal G command (00 group);
Its address format is same that of G01;
Cancel the tool nose radius compensation before using it;
Feedrate should not be set to too big to get the precise stop position;
a.
following block execution after skip:
1. The next block of G31 is the incremental coordinate programming shown in Fig. 3-13:
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