[modeleng] Re: Is piston rings : Was Lack of mail - just testing

That sounds like a better plan t'me Al - could be tricky getting the 'O' 
ring fit just right in that application.
Allen Messer wrote:
> Tony, you may want to consider sneaking in an Aluminum tube as a cylinder 
> liner and then use rings made of square faucet packing packed in grooves in 
> the piston.  Just a thought, as "O" rings will do quite well.
>
> Al
>
>
> --- On Fri, 9/5/08, Tony Wells <oaksfield@xxxxxxxxxxxx> wrote:
>
>   
>> From: Tony Wells <oaksfield@xxxxxxxxxxxx>
>> Subject: [modeleng] Is piston rings : Was Lack of mail - just testing
>> To: modeleng@xxxxxxxxxxxxx
>> Date: Friday, September 5, 2008, 10:49 AM
>> Partly so that Mike doesn't feel too lonely ... ;-)
>>
>> As I am finally back on line (curtesy of a new modem!) a
>> question for all of 
>> you steam engine experts ... I have been asked to make a
>> model steam engine 
>> out of wood, for demonstrating their operation with. Whilst
>> there is to be a 
>> "boiler", propulsion will be via compressed air,
>> most likely an electric car 
>> tyre pump, by the way, so there definitely and deliberately
>> won't be any 
>> temperature problems to burn any fingers, let alone set
>> fire to it all!
>>
>> As it will be all wooden construction, there will be some
>> small movement due 
>> to humidit and temperature fluctuations, more than likely,
>> and so I am 
>> worried about how to ensure a permanent seal between the
>> piston and the 
>> cylinder walls, as metal piston rings would only move with
>> temperature 
>> changes, and then not to any noticeable amount. I had
>> thought about using 
>> neoprene O-rings, tight fitting enough to still form a seal
>> if it all 
>> slackens up a bit, but can anyone recommend anything better
>> please? I had 
>> also thought about greased hemp or even string, but would I
>> need to knot it, 
>> with the knot then causing an obstruction, for instance.
>>
>> With thanks in anticpation,
>>
>> TonyW.
>>
>> MODEL ENGINEERING DISCUSSION LIST.
>>
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>>     
>
>
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