14. Coordinates System Setting Functions
14.9 Reference Position Check ; G27
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14.9 Reference Position Check; G27
Function and purpose
This command first positions the tool at the position assigned by the program and then, if that
positioning point is the first reference position, it outputs the reference position arrival signal to the
machine in the same way as with the G28 command. Therefore, when a machining program is
prepared so that the tool will depart from the first reference position and return to the first reference
position, it is possible to check whether the tool has returned to the reference position after the
program has been run.
Command format
G27 X__ Y__ Z__ P__
;
G27
X Y Z
P
: Check command
: Return control axis
: Check number
P1 : 1st reference position check
P2 : 2nd reference position check
P3 : 3rd reference position check
P4 : 4th reference position check
Detailed description
(1) If the P command has been omitted, the first reference position will be checked.
(2) The number of axes whose reference positions can be checked simultaneously depends on
the number of axes which can be controlled simultaneously.
Note that the display shows one axis at a time from the final axis.
(3) An alarm will occur if the reference position is not reached after the command is completed.