Subject:
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Re: Using airtanks on 8868
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Newsgroups:
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lugnet.build
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Date:
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Mon, 20 Sep 1999 08:39:59 GMT
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Viewed:
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731 times
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Hydraulic and pneumatic systems work differently. In the first one, your
working fluid is an incompressible one (liquid oil, generally) so you have
the full control of the stroke length of any piston.But in the case of
pneumatics, the working fluid is a compressible one (even compressed air)
and you practically cannot control the stroke of a piston, other than using
mechanical constraints.
Selçuk
John Morgan wrote in message ...
> In lugnet.build, Fredrik Glöckner writes:
> > "Tobias Möller" <tobias.moller@telia.com> writes:
>
> > Don't you loose all precise control with the air tank? My experience
> > with using the air tanks is that when you flip the switch, the cylinders
> > go _smack_ to the extreme position at once.
> >
> > Fredrik
>
> Hi Fredrik,
> That lack of control of the cylinders has been my experience too. You • really
> have to barely open the valve to be able to stop in partially extended
> movement. I wonder if you designed a cam that would squish the tubing past • the
> valve, maybe using gearing so the movement of the cam would be very slow, • then
> you might gain the finer control of the movement of the cylinders. the • valve
> would then become the "on /off" and the cam section adjusting the available
> pressure .
> Take care : )
> John
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Message has 2 Replies:
 | | Re: Using airtanks on 8868
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| (...) Sure, but in the original configuration of 8868, you have more control, as you can turn the compressor on and off for short durations and yield relatively small changes in the stroke of the cylinder. Adding an air tank really makes this much (...) (25 years ago, 20-Sep-99, to lugnet.build)
| | | Re: Using airtanks on 8868
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| Selçuk wrote in message ... (...) Outside, in the real world, I had actually designed a system for controling stroke of an air cylinder. It was a pressure valve which increased the pressure on one side of the cylinder, and increasing it slowly on (...) (25 years ago, 20-Sep-99, to lugnet.build)
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Message is in Reply To:
| | Re: Using airtanks on 8868
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| (...) Hi Fredrik, That lack of control of the cylinders has been my experience too. You really have to barely open the valve to be able to stop in partially extended movement. I wonder if you designed a cam that would squish the tubing past the (...) (25 years ago, 19-Sep-99, to lugnet.build)
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