Official GSK Agents in South Africa
Tel: +27 11 626 2720, [email protected]
GSK980TDi Turning CNC System User Manual
90
Ⅰ
Programming
3.15 Machine Zero Function
3.15.1 Machine 1
st
Reference Point G28
Command format:
G28 X(U) Z(W) ;
Command function:
the tool rapid traverses to the middle point defined by X(U), Z(W) from
starting point and then return to the machine zero.
Command specifications:
G28 is non-modal.
X, Z, Y: absolute coordinates of middle point;
U, W, V: Z absolute coordinates of middle point;
W: Difference value of absolute coordinates between middle point and starting point in Z
direction.
Omit all or one of X(U), Z(W) as follows:
Table 3-4
Running path(as Fig. 3-48) :
(1) Rapid traverse to middle point of specified axis from current position(A point
→
B point) ;
(2) Rapid traverse to reference point from the middle point(B point
→
R point) ;
(3) If the machine is not locked, LED is ON when the machine reference point return is
completed.
Z
X
Middle point
B（X，Z）
Machine zero R
Starting
point A
Fig.3-48
Note 1: Do not execute G28 and machine zero return without the zero switch on the machine.
Note 2: Machine zero returns in Jog mode and in G28 are the same and their deceleration signals and the
signal every rotation must be detected;
Note 3: X and Z move at the respectively rapid traverse speed from A to B and from B to R, and so the path is
not always a straight line;
Note 4: The system cancels the tool length compensation after executing G28 to perform the machine zero
return;
Command Function
G28 X(U)
X returns to machine zero and Z axis remains in the previous position
G28 Z(W)
Z returns to machine zero and X axis remains in the previous position
G28
in the previous positions and continuously execute the next block
G28 X(U) Z(W)
X, Z return to machine zero simultaneously
