Subject:
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Re: pneumatic cylinder: why not hydraulic ??
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 7 Apr 2004 23:57:28 GMT
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Viewed:
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2549 times
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In lugnet.technic, Harro de Jong wrote:
> 7. if you used hydraulics, a cylinder would extend or retract fully with
> one stroke of the pump.
Not necessarily. Assuming both cylinders are the same size, a full pump
cylinder stroke will only result in a full working cylinder stroke if the
working cylinder doesn't have significantly more resistance than the pump
cylinder. If the working cylinder is trying to lift a heavy load, two or more
pumps might be required to generate enough psi to lift the load.
> You also couldn't use compressors anymore.
Again, not necessarily. Theoretically a fluid with very little viscosity might
be pumpable by compressor, assuming you can get away with submerging the
compressor. The problem you'd have is that you'd need to keep the motor well
removed from the area, and running a drive shaft is the only way I can think of
that would prevent the hydrolic fluid from getting sprayed all over.
That still doesn't answer the question of why a hydrolic system would be
preferable to a pneumatic system.
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Message has 2 Replies:
 | | Re: pneumatic cylinder: why not hydraulic ??
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| purpledave@maskofdestiny.com (Purple Dave) wrote in <Hvtrvs.sBv@lugnet.com>: (...) And where would you leave all that fluid? Fluids aren't compressible (yeah, they are, but so much less than air that I'm close enough for government work). (20 years ago, 8-Apr-04, to lugnet.technic)
| | | Re: pneumatic cylinder: why not hydraulic ??
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| (...) It is my understanding that fliuds cannot be compressed. So a cylinder hooked to another cylinder with fluid in between (assuming no leaks), would always provide 1 to 1 movement. I'm not an expert in hydraulics, but I think your claim above (...) (20 years ago, 8-Apr-04, to lugnet.technic)
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Message is in Reply To:
| | Re: pneumatic cylinder: why not hydraulic ??
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| purpledave@maskofdestiny.com (Purple Dave) wrote in <HvrHn0.Cpw@lugnet.com>: (...) I'd add 7. if you used hydraulics, a cylinder would extend or retract fully with one stroke of the pump. The resistance the cylinder encounters is transmitted to the (...) (20 years ago, 7-Apr-04, to lugnet.technic)
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