3 G/M Codes
3 - 25
EX: N1 G00 X1. Z1. (From start-point to intermediate point)
N2 T00 Offset disabled (shall not situate at the same block with
G28)
N3 G28 X-Axis/Z-Axis returns to first reference point
N4 G29 Program returns from first reference point to (X1, Z1).
(See Fig. 3-15)
As the example above, the N3 block may have the following combinations:
N4 G29 X _____ Z _____ Return to (X1. Z1.)
N4 G29 X _____ Tool returns to X1.
N4 G29 Z _____ Tool returns to Z1.
Details:
1. The X/Z Value in the program format is insignificant; however, a value must be
given for entering into the program, it merely tells the machine to which axis the
reference point is to be returned.
2. After executing G28, use G29 command to return the tool to its previous position
before G28 is executed.
3. The G29 command cannot be used alone. A G28 or G30 must be given prior to
G29.
3.13 2nd Reference Position Return, G30
Functions and Purposes:
Via G30 command, the specified axis is returned to the second reference point at high
feed-speed of the respective axis.
Format:
G30
or G30 X(U)_____ Z(W)_____
or G30 X(U)_____
or G30 Z(W)_____
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