Ah yes, thanks - used some 15mm plate again, but this time wide enough to reach the gantry sides - 3 tapped holes and they are now tied into the gantry sides as well as the bottom of the gantry.

Of course I have yet to cut anything to see if they work as intended, but I'm getting closer. Just let the spindle run up to 12,000rpm using the settings above (apart from 11Amps which the VFD was already set for) by setting PD003 to 200.

The spindle is very quiet (certainly quiet compared to hand held routers I have).

Chris