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G28 command returns
the current tool to the CNC machine zero position via an intermediate point.
G28 command (G-code) moves the
current tool at a fast traverse rate (G00).
G28 is not a modal
code.
The return to the CNC
machine zero position is intended primarily for the possibility of checking the
size and quality of the workpiece in some part of the CNC program.
G28 X... Y... Z...
Z... A... B... C...
| X |
X
coordinate of the intermediate point. |
|
Y |
Y
coordinate of the intermediate point. |
|
Z |
Z
coordinate of the intermediate point. |
|
R |
A
coordinate of the intermediate point. |
|
P |
B
coordinate of the intermediate point. |
|
F |
C
coordinate of the intermediate point. |
Example of using G28 in an CNC program.
%
O0001 (G28
example) (Program number (O0001) and Program name (G28
example)
G00 Z0.5 (Safe Z)
G00 X-63 Y71
G01 X25 Y16
G28 Z0 (send
the Z axis to the machine zero reference position via point Z0)
M30 (End)
%
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CNC G-codes.G28 command -
Return to the primary CNC machine zero reference position