As I wrote in title, spindle loses speed and machine is still executing .nc (tips broken, part moved in vice). The problem is that there is no alarm message. Probably its all "ok" when tool load is small, like 10 %, but I was roughing with highfeed mill and load was arund 60% (120 vc - 1200rmp) when that spindle failure occurs. Ive made 2 parts and it happened on third so there is no problem with .nc.
Someone any ideas?

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