Lately I've been watching some videos on machining and hydraulics as it always interested me.
I was toying with the idea of building a budget CNC mill with threaded rod for the axes, but the issue of backlash was bugging me.
Then I thought about using hydraulic pistons instead. If used in conjunction with a positive displacement pump and using a large hydraulic transmission ratio the issue of precision could be sorted out, and the incompressibility of the fluid would help to keep backlash to a minimum.
I searched but found little info on hydraulic actuators for precision positioning, so I believe there's something I must be missing