Re: Crank opperated hydraulic?

On Sat, 05 Aug 2006 11:46:33 -0500, Don Foreman
<dforeman@xxxxxxxxxxxxxxxxxxxx> wrote:

On Sat, 05 Aug 2006 12:43:04 GMT, Anthony <tonytn36sp@xxxxxxxxxxx>
wrote:

"Tom Gardner" <tom(nospam)@ohiobrush.com> wrote in
news:JDUAg.2377$FN2.1011@xxxxxxxxxxxxxxxxxxxxxxxxxx:

I had an idea of a crank operating a hydraulic cylinder connected to
another hydraulic cylinder that would do the work. I need about 300
lbs force with a 3/8" stroke. I need the cylinder to cycle an extend
and a retract stroke in 250 to 300 milliseconds max. and do it 90
times a minute or more. It sure would simplify a complex mechanical
system. Is this possible? Is there another way to do it?



The heat is gonna kill you. Moving the fluid that fast, at that cycle
rate is going to generate some serious heat in short order.

I agree.

If the plumbing is relatively unrestricted, the heat produced would
be considerably less than that generated by a solenoid.

Maybe but there's also the fact that the way he's talking about
doing the fluid won't really be circulating. My instinct on this is
that there's going to be localized hot spots. Especially at the
cylinder which will have a lot of friction from the seals working this
fast. If there was more circulation then the heat could be drawn off
and dealt with easily.

Add this to the wear, leakage problems that you've already brought
up (and I agree completely) makes me think that this is not going to
be a good way of solving this particular problem.

.

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