just to clarify my crazy thought since the UC300eth has 6 axis and a ton of IO in theory this is plenty to set up 3 axis for the mill plus IO and 2 axis for the lathe plus IO

my thinking is then I can set up separate machine profiles in Mach and either use one or the other.

while I cant think of any reason this shouldn't work its certainly not a standard use case that the manufacturer will have considered so I wouldn't be surprised if it wont work that way but its an interesting thought and given the small price difference between the UC300 and UC400 might be worth trying