The PC switch-off turned out to be overheating. At least that is all I can think of as it had been on all afternoon machining and it was a very hot day. It's working fine now.

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I've fitted all of the buttons and started to wire some of it up. Power on/off, e-stop and reset, auxillary to run cooling pump and fan, and spindle start/stop all work. In the process of wiring up the spindle speed through the 10K pot. I'm hoping to get the readout to show the rpm.

Cycle controls and feedrate are not functioning yet. I've still got the POKEYs board to fit and wire up to get those going.

All the e-stop interlock functionality works (e.g. can't start spindle until e-stop is reset, and pressing e-stop stops drivers and spindle), but I've noticed that if the VFD is off at the mains and you switch on the control system, reset the e-stop to get the drivers on, and press the spindle start button on the new control panel, and then switch the VFD on at the mains the spindle starts straight away. It might be possible to add a further interlock for the spindle start/stop if the VFD is not on but as I can't reach the mains socket and the spindle at the same time its not a big concern just something to be aware of.