Re: [PSUBS-MAILIST] Shelsol D60 experiment

[MerlinSub@t-online.de]

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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