hi,

we are facing an issue with Makino a55 machine, issue is during cutting time in auto mode tool released from spindle, for this we have checked possible cause like draw bar clamp force, de-clamp cylinder and its DCV valve, all find ok, and checked the operator history all found ok, no abnormality found.

problem in sequence wise.

operation have total 8 tool to run, when in last operation is end mill total travel is 100mm, in that first 40mm cut taken correctly after that we got an alarm of spindle clamp signal missing, when opened the operator door seen that tool came out from spindle and made hole in the component. no abnormal sound came.

we checked the tool and in spindle cone for any rubbing mark, no mark is seen both area to confirm that spindle got de-clamped during spindle rotation, program spindle RPM was 5500. we have checked the operator history we can see that clamp signal missed after that alarm generated, we can see the timing for signal missing.

we are still blank out how the tool came out from spindle and made the hole in component. we are doing our best to find out the issue, hoping any one can give us check point or suggestion.

Regards,

Finix varghese