Re: [CAD_CAM_EDM_DRO] Re: replacing feed screw with a hydraulic cylinder

Well, the idea was to make a "poor man CNC" - for example, simple
combination of an oversized hydraulic cylinder and 2-way 3- position valve
could
work for a simple applications, not requiring interpolation. It can work
strictly on an encoder feedback, completely replacing lead screw and the
drive.
However it will work only for a rectangular cuts or a very rude arcs.
Power steering cylinder seems to have everything, but the only problem
is, it was designed for cars in mind - the stroke is too small for a long
feed.
Other ideas cost more to implement then the servo-encoder combination.
Unless somebody comes up with a better one?
Regards, Alex

----- Original Message -----
From: jim davies <jdavies@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, November 08, 2002 11:57 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: replacing feed screw with a hydraulic
cylinder


>
>
> > This sounds like a really great idea - everything seems to be fitting
> right
> > in place.
> > I will try to familiarize myself better with an auto steering - may be
> this
> > is the way
> > to go.
>
> It would work well as an "assist" because that is what it does on a car.
> All power steering systems work the same way, no matter what vintage
> or style. In fact, the rotary spool valve that is the most common style
> nowadays would probably be the best for such a system. Just fit one
between
> feed wheel and feed screw. But, what is the advantage of doing this?
>
>
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