FANUC 18iT, locking the work shift value

[MRPM]

I'd like to lock the value of work shift EXT X (set to the turning center of the lathe) so you couldn't change it by accident. I think this is done with the help of machine parameters but how?

[dcoupar]

I couldn't find a parameter to lock out modification of individual axes for either work or shift offsets. My guess is if there IS a parameter, it would lock both X and Z.

I believe you could put a G10P0X0 at the beginning of each program to ensure the X Work Shift is set to 0.

[Al_The_Man]

How is your lathed homed right now, i.e. value of X at machine home?
Is it Machine zero position you wish to change?
Some set ups enter the machine home position distance based on the tool post face at turning centre, the tool offsets can be entered as usual.
This would be done automatically by the parameter value being plugged in when homed.
Al.

[MRPM]

dcoupar understood what I'm talking about (and I take the blame for those who didn't - English isn't my mother language, sorry). If anyone knows the right parameters for preventing the change of work shift values please let me know.

[Al_The_Man]

I misunderstood.
Generally with Fanuc the lockout is done by four hardware memory protection key inputs.
In most cases the MTB will enable all four with one key lock switch on the panel.
But it is possible to differentiate between all four by separating the inputs.
The four are:
KEY1 Enable the entry of tool comp and work zero offsets
KEY2 Enable the entry of Setting data user parameters and macro
KEY3 Enables the edit of part program
KEY4 is system dependant and I am not sure what it is on the 18i
A concealed switch could be wired in the control enclosure and input to Key1.
Al.

[viorel26]

That is what were looking for?

[dcoupar]

That is what were looking for?

I believe that setting these to 1 will disable the setting of both X AND Z work shifts from MDI. MRPM only wants to disable the X.

Here's another thought (see attached). From the way I read this, if you set 3134 X = 0, then if there's a 0 value in the offset, it won't be displayed. I've never tried this, however, so no guarantees.