On Thu, 31 Jul 2008 22:50:45 GMT, Anthony
wrote:

"Denis G." wrote in news:a4003630-b489-4b03-bd1e-
:


I've seen descriptions of hydraulic systems made by companies like
Enerpac that control the balancing of bridge sections to keep them
level while being positioned with cranes. I know that hydraulics can
be controlled with electronics and proportional or servo valves.
Probably it's difficult to beat mechanical feed and leadscrews because
it's a simple and accurate system, but I was just curious.


Hydraulic feed is an _old_old_ technology. Very inefficient also. Reliable
control can also be a significant issue.

--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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We do it all the time with applications that make leadscrews
impossible.

The last five machines we built have had zero follow-up calls.

This must be an area that you are unfamiliar with.
Daveb