1. G Function Description
1.2.15 G30: 2nd, 3rd and 4th REFERENCE POSTION
RETURN
Command form:
G30 Pn X Y Z ;
X、Y、Z: mid-point coordinates；(absolute value under G90, increment
value under G91)
Pn: Specified reference point(parameter #2801 ~ #2860)
P1: mechanical origin point；
P2: second reference point；
P_: default is P2；
Description:
for the convenience that change tool and check, we use parameter to
set a reference point to suitable position, it can let tool need not return to
mechanical zero point, increase efficiency in changing the tool, the usage of
this command is the same as G28 only expect returned point. Floating
reference position return command, usually use in the position of
automatically change the tool differ from the origin point. Movement mode
G00.
<Notice> usually this command use in automatically change the tool,
for safety, before do G30, need to cancel the tool compensation function.
Example:
Y
Third
reference
point
Second reference point
workpiece
950
9
C (15,10)
9(
950 950
B (75,25)
A (60,10)
950
X
9 Mechan9ical origin point
9
9(
9(
9(
33
    "