Last night I was finishing up a part on my Vertical maching center, YCM supermax rebel 1with Fanuc 0MC control (1995). The last tool finished and I always program a tool change back to tool 1 at the end of the program. As soon as the coolant turned off, I opened the door, no lock, and started blowing off the chips and coolant. I was looking down at the table and not watching what was going on, heard a loud bang and tools and pieces started flying. All came to rest with the spindle empty, 5 tools on the table and chip pan, 2 pieces of carousel in the pan, display reading tool 2, and me with a confused look. Power surge? relay hanging up? switch failure?

I am going to run it as a 14 tool machine for now, since I have no idea what went wrong. Any ideas on what to check?