The CNC spindle shut down half way through the Eagle head job. I found that the power cable from control box to spindle was bad. I replaced the wire and was able to save the job. Today I examined the old wire to see what was damaged. First thing I found was a random copper strand sticking out of the insulation. This wire was connected to the blue wire. See first pic. Then I stripped back the insulation and found the blue wire damaged and the green wire severed. See second pic. I replaced this wire with a heavier gage wire. So I hope this doesn't happen again.