Fagor CNC 8070, Programming Manual, Page: 68 / 556

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Programming manual
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CNC 8070
3.
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3.2 Programming in millimeters (G71) or in inches (G70)
The displacements and feedrates of the axes may be defined in
millimeters or in inches. The unit system may be selected by program
using the following functions:
G70 Programming in inches.
G71 Programming in millimeters.
Both functions may be programmed anywhere in the program; they do
not have to go alone in the block.
Operation
After executing one of these functions, the CNC assumes that unit
system for the following blocks. If none of these functions is
programmed, the CNC uses the unit system set by machine
manufacturer [G.M.P. "INCHES"].
When changing the unit system, the CNC converts the currently active
feedrate into the new unit system.
Properties of the functions
Functions G70 and G71 are modal and incompatible with each other.
On power-up, after an M02 or M30 and after an EMERGENCY or a
RESET, the CNC assumes function G70 or G71 as set by the machine
manufacturer [G.M.P. "INCHES"].
...
G01 G71 X100 Y100 F508 (Programming in millimeters.
Feedrate: 508 mm/minute)
...
G70 (Change unit system.
Feedrate: 20 inches/minute)
...