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Re: [PSUBS-MAILIST] Shelsol D60 experiment
Hi Carsten,
Here is a link to the Shellsol D60 pdf.
http://www.scdynamiccontent.shell.com/Files/aliphaticmineralspirits_shellsold60_americas.pdf
It has a cubic expansion coefficient @ 20 degrees C.
To be honest I don't know how to interpret this information,
but possibly you can, If not I'll cook some up.
Alan
----- Original Message -----
From: <MerlinSub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Friday, December 24, 2010 9:48 PM
Subject: Re: [PSUBS-MAILIST] Shelsol D60 experiment
Hi Alan, can you do us a favour?
Heat up 100 ml or 200ml of the D60 oil from 20 to 60 or 80 degree in a
jena glass cup with scale and meassure the volume change?
www.chemoline.de/images/d53247ab0ehoheform.jpg
If the Glas cup is high as possible with a small base shall give good measuring
results ever with a lower amount of oil volume.
http://www.orange-sinne.de/uploads/pics/reagenzglas_01.jpg
I try to us the D60 oil maybe in the Euronaut Bowthruster insted of
WD40 which expand - seems a lot.
Also it seems that WD40 vapour at higher degrees and create overpressure..
happy Christmas to all Carsten
<JimToddPsub@aol.com> schrieb:
Hi Alan,
Now that you mention it I recall the issue with the brushes lifting. As
with most areas in life, everything seems to be a trade off. I'll stay
tuned to the search for the perfect fluid.
It would be interesting to know the coefficient of thermal expansion for
various fluids at the temperatures generated by the motors in our operating
environments. It seems there would be several variables: continuous and
intermittent run time, cooling effect of the water, etc. Perhaps there
isn't enough expansion variation from fluid to fluid to even be concerned with
it. One can over-think these things.
Thanks,
Jim
In a message dated 12/23/2010 5:59:18 P.M. Central Standard Time,
alanjames@xtra.co.nz writes:
Hi Jim,
I started off using a mineral oil in my small DC brushed linear actuator
motors.
This was too viscous & created (as Phil describes it) a "herky Jerky"
movement due to it's centrifugal motion
causing the brushes to lift temporarily. Possibly larger motors would be
OK.
Another option I looked at was WD40 wich is used by Psubbers for motor
compensation & is also mainly mineral spirits.
The WD40 can degrade some plastics quickly due to the levels of aromatics
& although people have used it successfully in motors,
my application was primarily for inside linear actuators that have
electronics, so didn't want to chance it.
I couldn't track down a silicone with a low enough viscosity & if I had it
probably would have cost a fortune.
The Shelsol D60 was recommended to me by a chemical importer, as it had a
low viscosity & was highly refined with a
low level of aromatics. It also has a higher flash point than WD40.
Regards Alan
----- Original Message -----
From: _JimToddPsub@aol.com_ (mailto:JimToddPsub@aol.com)
To: _personal_submersibles@psubs.org_
(mailto:personal_submersibles@psubs.org)
Sent: Friday, December 24, 2010 11:31 AM
Subject: Re: [PSUBS-MAILIST] Shelsol D60 experiment
Hi Alan,
Interesting to hear how the various plastics stood up to D60. Why would
you use mineral spirits (a solvent) instead of light mineral oil as a
compensating fluid?
Jim
In a message dated 12/23/2010 2:31:22 P.M. Central Standard Time,
_alanjames@xtra.co.nz_ (mailto:alanjames@xtra.co.nz) writes:
Hi,
A couple of months back I posted that I was experimenting with Shelsol D60
for use as a
compensating fluid for my motors & linear actuators.
This is a low viscosity, low aromatic mineral spirit.
_http://www.scdynamiccontent.shell.com/Files/aliphaticmineralspirits_shellso
ld60_americas.pdf_
(http://www.scdynamiccontent.shell.com/Files/aliphaticmineralspirits_shellsold60_americas.pdf)
I left polystyrene, acrylic, & bits & pieces of household plastic soaking
in it.
I just noticed that after 2&1/2 months the polystyrene had shriveled
slightly & sunk.
This was a good result compared with WD40 wich did this to the polystyrene
in less than a
day.
The Shelsol also caused some of the cheap plastics to become brittle. The
Acrylic, acetate
& some other plastics (not sure what they were) were unchanged.
I haven't tried running my submarine motors in it. But one of my very
small linear actuator motors wich
had been soaking in it for the same time frame works fine.
Although the result was great compared with WD40, it's still degrading
some plastics & I'll have
to rethink what I'm doing with my actuators as there are electronics
inside them that may be affected.
Alan
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