Fanuc Series 15i/150i-MA (Programming) Operators Manual

7.COORDINATE SYSTEM PROGRAMMING B-63324EN/03
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7.1 MACHINE COORDINATE SYSTEM
The point that is specific to a machine and serves as the reference of the
machine is referred to as the machine zero point. A machine tool
builder sets a machine zero point for each machine.
A coordinate system with a machine zero point set as its origin is
referred to as a machine coordinate system.
A machine coordinate system is set by performing manual reference
position return after power-on (see Operation II-3.1). A machine
coordinate system, once set, remains unchanged until the power is
turned off.
Format
(G90)G53 IP ;
IP ; Absolute dimension word
Explanation
- Selecting a machine coordinate system (G53)
When a command is specified the position on a machine coordinate
system, the tool moves to the position by rapid traverse. G53, which is
used to select a machine coordinate system, is a one-shot G code; that is,
it is valid only in the block in which it is specified on a machine
coordinate system. Specify an absolute command (G90) for G53.
When an incremental command (G91) is specified, the G53 command
is ignored. When the tool is to be moved to a machine-specific position
such as a tool change position, program the movement in a machine
coordinate system based on G53.
Limitation
- Cancel of the compensation function
When the G53 command is specified, cancel the cutter compensation,
tool length offset, and tool offset.
- G53 specification immediately after power-on
Since the machine coordinate system must be set before the G53
command is specified, at least one manual reference position return or
automatic reference position return by the G28 command must be
performed after the power is turned on. This is not necessary when an
absolute-position detector is attached.
- Specification in the same block
Note that G50/G51, G50.1/G51.1, and G68/G69 codes are ignored in a
block where a G53 code is specified.

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