[jay_dizzle]

i want to be able to 'zero' or 'set' my G54, G55, G56, ect. from within a single program. specifically my 4th axis 'zero'

i am machining multiple features around the circumference of a part and want to just index the part incrementally, zero the 4th axis and continue to machine the feature in absolute

please try to keep any help relatively simple as i am fairly new

fanuc 31i

[fordav11]

you can set the workshift with macro using system variables
to change the G54 of 4th axis all you do is #2801=#5024 (#5024 is machine coordinate of 4th axis)
if you are setting G54 for X you just position it where you want X0 and then do #2501=#5021
for Y it's #2601=#5022
if the workshift value that gets auto-set is negative and you want positive use #2601=ABS(#5022)
look here for all of the variables available....
Fanuc system macro variables

[jay_dizzle]

so, excuse me if im being simple minded but i literally just type " #2801=#5024 " directly into the main program?

edit: i tried to modify my program in the fashion listed above and it still isnt writing to my work offsets...

my goal is this

safety line
4th axis to zero
machine feature in absolute
rotate 4th axis incrementally
zero 4th axis
machine feature in absolute
rotate 4th axis incrementally
zero 4th axis
machine feature in absolute
ect
ect
ect

[zavateandu]

after you rotate the 4th axis with G91 you have to write down in program #500=#5024
when you write in the program #500=#5024---- in this moment the coordinate of 4th axis is being copied to macro #500
from this moment in the machine feature you have to use the #500 value as 4th zero like G28 X0 Y0 Z0 A#500
after you finish you put again the #500=#5024 in program and the value is overwrite.

[jay_dizzle]

i got it to work this morning finally, as it turns out, the G10 function is what i used, it took some playing but now works flawlessly.

it ended up looking something like this

G90
X_ Y_A_
Y_
X_
X_Z_
A0.0
G91 L2 P2 A45.0 <-- SETS G55 COORD TO 45 DEGREES FROM ORIGIONAL ZERO
G90
X_ Y_A0.0 <-- GOES TO THE NEW A ZERO
Y_
X_
X_Z_
ECT
ECT
ECT

[sinha_nsit]

The system-variable method did not work because it was modifying G54 and you are working in G55.
Change the variables suitably and it would modify G55 which you need.
G10 is old school. People generally prefer system variable method.

Edit: The formula assumes that you have all zeroes in Ext Offset.

[fordav11]

yeah using G10 is over complicated and long-winded. real programmers use macro ;-)