[nikonie]

We have a Victor Vturn II-26 lathe (year 2002, Fanuc 18TC). I changed the grid shift value for X -axis and after I changed it back what it was the machine won't go to reference anymore.

I have been discussing with Fanuc technician and changing grid shift has removed the reference point (Parameter 1815.4 (APZ) = 0) because this machine has absolute encoder (Parameter 1815.5 (APC) = 1). Parameter 1815.5 is now set to 0 to make movement possibly without reference point and limits are set to 999999 (Parameter 1320 X) and -9999999 (Parameter 1321 X), machine still gives error: 506 OVER TRAVEL: +X at machine POS 2.0 (about).

Interesting about this is that 506 is a hard limit and limit switches are far away from real hard limits. So, there is probably some kind of fail safe that prevents X -axis to go more than 2mm to + direction. Does anyone know how can I bypass this?

Any advice is greatly appreciated!

P.S. I'm also looking for turret correction instruction for same machine, turret type is Lio Shing LS-250SV(12).

[zavateandu]

check your data table parameters,(SYSTEM-PMCPRM-DATA-GDATA)i think you have alos a limit there for X axis + direction,Victor use in some machine a double parameter fr security.
The number must be the same,i can not remember now where is exactly,but if you had in 1320---2000,mean 2 mm in the data table must be the same and should be near the minus limit.
During navigation in data table ,should show you the name and expalnation of every data table parameters what it means.
About turret i can help you if you need too.