Dear all,
I have got an old lathe Fanuc 0T-B controlled. Last days I noticed a strage working on spindle speed rotation . When I command in MDI or Auto mode G97S200M3, spindle starts running correctly at 200rpm; instead when I command G97S200M4, spindle runs at 180rpm.
At every speed commanded in M4 direction, spindle rotation is lower about 20rpm then commanded speed.
Do you have some ideas about this trouble?