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"Jennifer Clark" <jen@vulture.dmem.strath.ac.uk> wrote:
> "Kevin L. Clague" <kevin_clague@yahoo.com> wrote in message
> >
> > The biggest issue when fully expanded is leverage to the side which can • lead to
> > leakage. I've experienced it once in a while.
>
> Interesting, I've noticed this happens quite a lot when joing two large
> cylinders back to back to make a larger double cylinder, and some cylinders
> seem more prone to it than others. Working the cylinders a few cycles
> sometimes seems to reduce it a bit, but not always. It is a rather annoying
> problem.
I sucked grease - by manually pulling the plunger with a dab of grease
on the bottom air input - into my cylinders and they move more
consistently and don't leak pressure. I used ceramic grease of the
type you get for RC car gearboxes. They aren't much easier to move,
but they do move more smoothly and I've not had the problem with
pressure leakage. I can't say I put much lateral stress on them
though.
The same grease on a large turntable worked as well - perhaps harder
to turn but no sticking at all, making precise movements easier.
Tim
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> I sucked grease - by manually pulling the plunger with a dab of grease
> on the bottom air input - into my cylinders and they move more
> consistently and don't leak pressure. I used ceramic grease of the
> type you get for RC car gearboxes. They aren't much easier to move,
> but they do move more smoothly and I've not had the problem with
> pressure leakage. I can't say I put much lateral stress on them
> though.
Would not the grease eventually find it's way out into the hoses and make the
hose connection a bad one because of the slippery grease?
--
Best regards,
/Tobbe
<http://www.lotek.nu>
(remove SPAM when e-mailing)
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"Tobbe Arnesson" <StPnAtM@lotek.nu> wrote:
> > I sucked grease - by manually pulling the plunger with a dab of grease
> > on the bottom air input - into my cylinders and they move more
> > consistently and don't leak pressure. I used ceramic grease of the
> > type you get for RC car gearboxes. They aren't much easier to move,
> > but they do move more smoothly and I've not had the problem with
> > pressure leakage. I can't say I put much lateral stress on them
> > though.
>
> Would not the grease eventually find it's way out into the hoses and make the
> hose connection a bad one because of the slippery grease?
I've not encountered grease coming back out. It takes a really good
tug to suck it in there and you don't get the same level of airflow
when in normal use. The grease is fairly thick. After a bit of initial
vigorous pumping by hand to spread the grease any excess is ejected
and I've not seen any more come out. I've done it to the clear
cylinders and a little stays top and bottom with a little smeared over
the inside.
Tim
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"Tim Auton" <tim.lugnet@uton.org> wrote in message
>
> I've not encountered grease coming back out. It takes a really good
> tug to suck it in there and you don't get the same level of airflow
> when in normal use. The grease is fairly thick. After a bit of initial
> vigorous pumping by hand to spread the grease any excess is ejected
> and I've not seen any more come out. I've done it to the clear
> cylinders and a little stays top and bottom with a little smeared over
> the inside.
I've just tried this and it does make a significant improvement, especially
on older cylinders. With two old cylinders connected up in parallel, I found
that the treated one would extend and retract before the untreated one, and
when both were treated both became more or less equal again. I don't suppose
there is any chance of damage to the seals from this grease?
In my own tests I can confirm that it also makes an improvement to the
technic turntables.
Jennifer
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"Jennifer Clark" <jen@vulture.dmem.strath.ac.uk> wrote:
[ceramic grease in pneumatic cylinders]
> I've just tried this and it does make a significant improvement, especially
> on older cylinders. With two old cylinders connected up in parallel, I found
> that the treated one would extend and retract before the untreated one, and
> when both were treated both became more or less equal again. I don't suppose
> there is any chance of damage to the seals from this grease?
I hope there's no chance of damage :) I went for ceramic grease over
organic as I understand it's fairly inert. I'm no chemist though and I
don't even know what the seals are made from.
A check of my cylinders (which had this treatment about 18 months ago)
shows they are still holding pressure and in the transparent ones I
can't see any visible degradation of the seals. So far, so good.
Tim
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"Tim Auton" <tim.lugnet@uton.org> wrote in message
>
> I hope there's no chance of damage :) I went for ceramic grease over
> organic as I understand it's fairly inert. I'm no chemist though and I
> don't even know what the seals are made from.
It was ceramic grease I used as well, from Tamiya. It's still working today
:-)
> A check of my cylinders (which had this treatment about 18 months ago)
> shows they are still holding pressure and in the transparent ones I
> can't see any visible degradation of the seals. So far, so good.
Excellent!
Jennifer
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