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Chapter 3 G Commands
91
Ⅰ
Programming
3.15.2 Machine 2
nd
, 3
rd
, 4
th
Reference Point G30
Machine zero is fixed point in the machine tool, decided by the zero switch and zero return switch
installed on the machine tool.
Machine reference point is located at the position after the machine zero offsets No.114 or
No.115 value, when No.114, No.115 setting value is 0, the machine reference point coincides with the
machine zero. The coordinates of machine reference point are No.120, No.121 setting value.
Executing machine zero return is considered to executing the machine reference point return.
GSK980TDi has machine 2
nd
, 3
rd
, 4
th
reference point functions. Use separately No.122
～
No.127
to set X, Z machine coordinates of the machine 2
nd
, 3
rd
, 4
th
reference point.
The relationship between the machine zero, machine reference point, machine 2
nd
, 3
rd
, 4
th
reference point is as follows:
Fig.3-49
Command format:
G30 P2 X(U) __ Z(W) __;
G30 P3 X(U) __ Z(W) __;
G30 P4 X(U) Z(W) ;
Command function:
the tool rapidly traverses with the rapid traverse speed to the middle point
specified by X(U) , Z(W)
Command specifications:
G30 is non-modal.
X: X absolute coordinate of the middle point;
U: difference value of X absolute coordinate value between the middle point and starting
point;
Z: Z absolute coordinate of the middle point;
W: difference point of Z absolute coordinate between the middle point and starting point.
Omit one or all of X (U) , Z(W) as follows:
Command Function
G30 Pn X(U)
X returns to the machine nth reference point, Z axis retains
G30 Pn Z(W)
Z return to the nth machine reference point, X axis retains
G30
X and Z retain, go on executing the next program block
G30 Pn X(U) Z(W) X and Z return to the machine nth reference point simultaneously
Note 1: n in the above table is 2, 3 or 4;
Note 2: Do not check the deceleration, zero signal when you execute the machine 2
nd
, 3
rd
, 4
th
reference point.
The machine zero
The 3
rd
machine reference point
The 4
th
machine reference
The 2
nd
machine reference point
Z
X
№
120
№
120
№
121
№
122
№
123
№
121
№
123
№
122
№
114
№
114
The machine reference point
