OK so I'm aback at it again. Need to make adapters for my encoder shafts to fit the resolver gears. 1/8 on the encoder and 1/4 on the resolver gear. Is it possible to do away with the resolver and tach and just replace it with the encoder? Hood told me it all depends on whether or not the NC400s require a tach signal.

I managed to find a NC400 manual in English. https://www.cnczone.com/forums/servo-motors-drives/25821-contraves-nc400-dc-servo-2.html