I have an LC40 and last week I was running parts and after a couple of hours of cranking out parts, I load the next bar and hit start and the coolant turns on but it just sits there.

Hit reset, nothing. Turned off the control and back on, didn't help. Turned off the whole machine and went to lunch. Came back and turned it back on and it was fine.

Today it did the same thing again... turned off the machine and almost immediately back on and it was fine for 2-3 more parts then it did the same thing.

I know the program starts when I hit the cycle start button because the coolant turns on. I opened the cabinets in back and I don't see any error lights on the spindle drive - only two green lights.

Any ideas what could be happening? It seems maybe temperature related since it happens only after a while of running the machine.