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jan.mevis(at)informavia.b
Guest

Posted: Mon Feb 15, 2010 9:18 am Post subject: Pneumatics

That is absolutely correct, Doug: pharmaceutical grade glycerine  and VERY EXPENSIVE ethylalcohol (very expensive in Europe because of the taxes). But you don’t need much. I also concur with what you state about “over” lubrication. Only two cubic centimeters per actuator. And absolutely no METHYLalcohol.  

   

Jan  

     

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of doug sapp

 Sent: maandag 15 februari 2010 5:27

 To: yak-list(at)matronics.com

 Subject: Re: Pneumatics  

  

   

Guys,    

As many of you know up until 2008 one of my duties in life was to preserve flowers (Riverview Floral LTD), primarily Gypsophila, which is a small wildflower used mainly as a filler flower in bouquets and floral arrangements.  Without boring you with all the biology, and chemistry involved, I'll get to the nuts and bolts of the process.  We normally would use 5 to 7000 gallons of USP grade Glycerine annually.  Glycerine is both a humectant (absorbs water), and a plasticizer which lends flexibility to the product once introduced into the cellular structure of the plant.  

    

   

    

Alcohol also has the ability to absorb moisture, so the use of these two items in limited amounts in the pneumatic system should be a good thing unless we have an 0 ring incompatibility problem with the Ethyl alcohol.  Glycerine is inert, so no worries there.  I say "limited quantities" because many of the gear actuators which I have been getting in for cores have most if not all of the high pressure grease washed out of them because of over lubrication with light machine or tool oil which was incorrectly injected into the system.  

    

   

    

Do NOT mess with Methyl alcohol, it's very bad stuff, nerve damage, blindness, are only a few of the problems associated with the use of this chemical.     

    

   

    

I have a limited amount of US Pharmaceutical Grade Glycerine which could be decanted into gallon jugs (it's in 55 gallon drums now).   Price is about $25.00 per gallon.  Weight is 10.41 pounds per gallon.  

    

   

    

Always Yakin,  

    

Doug  

    

     

On Sun, Feb 14, 2010 at 11:22 PM, Jan Mevis <jan.mevis(at)informavia.be (jan.mevis(at)informavia.be)> wrote:  

--> Yak-List message posted by: "Jan Mevis" <jan.mevis(at)informavia.be (jan.mevis(at)informavia.be)>

 

 The product originally used by the Russians (sixties/seventies of the former

 century) is not available anymore, and its content is unknown. What the

 Russians and the Lithuanians advise now, is a 50/50 volume mixture of very

 clean glycerine and 96% ethylalcohol, only a few cubic centimeters per

 actuator. The Russians started using this mixture in the eighties and they

 loved doing this work, because they could order somewhat more ethylalcohol

 and use it for their own home-made wodka (at least this has been told to me

 by a Russian mechanic).

 

 The Russian and Lithuanian mechanics insert it straight into the actuators,

 using an injection needle and at the same time pumping with the gear leg to

 suck it in.

 

 Jan RA2005K YK50      



 

 --

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wise(at)txc.net.au
Guest

Posted: Mon Feb 15, 2010 4:02 pm Post subject: Pneumatics

G'Day All,

  

 I found all the postings re the pneumatics to be  extremely interesting and of good value.

 Doug's article is excellent.

 Goes to show, it does not matter how ald one is,  one learns every day.

  

 Thanks.

  

 Cheers, Chris.

   [quote][b]

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