first off this machine has been running for over 3yrs and we have used every tool position available. Recently we are having an issue with offset 16 not repeating its position. Not tool 16, just the offset. Touch the tool off do a tool change and bring it back in and its off .03. Its not consistent either. It did it a couple times in a row, then i couldnt replicate. Any ideas? I called Toshiba, they seem to think its an application issue but have not gotten back to me with an update.
i have experience with VTL and big tool with BT 50 .
check the inside spindle surface for chips stick to it,check the tool cone,as you say is only on 16 tool measuring,i think that tool do not position in same place after clamping due to some chips that make it to be in diferent position
that are my 2 cents for you.
Good luck.