Re: replacing feed screw with a hydraulic cylinder

I've thought about hydraulic drive CNC for years. This may have
already been discussed but my idea is to use a closed system with
single shot pistons powered by solenoids or a motor driven cam. Each
stroke of the piston would pump a metered amount of fluid from one
side of the cylinder to the other kind of like a hydraulic jack. One
stroke of the piston would equal a fixed amount cylinder travel. A bi-
directional piston with check valves could be used to change the
direction. Example: 1000 piston strokes could equal 1" of
travel, kind of like a linear stepping motor. A stroke counter
could keep track of the position. This system should work with
stepper motor software. Some obvious negatives I can think of: Slow
speed (?), piston seal leakage, temperature may change volume of
fluid (?). Just thinking out loud but I'd like to hear what
others
think.

--- In CAD_CAM_EDM_DRO@y..., "al5502" <telecomt@t...> wrote:
> Did somebody try to get rid of the feed screw all together
> and replace it with a hydraulic cylinder?
> At the first glance it may present several advantages:
> no backlash, big force at low cost.
> Alex