Minature Roller Chain

[derekwarner_decoy]

Hi  PD's - please excuse me posting outside of our site... bloody new computer &  I am trying to get everything across from the old near dead  unit
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 Yes Eddy - the  minature roller chain is from the Small Parts & Bearings people [in oue WEB  links]  - all the details are  there
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 The smallest chain  pitch [pin to pin] is 3.747 mm or 0.1475" - [same pitch as used on our PS  Reliant model]
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 4" pitch  roller chain was used on some early OZ paddlers so the she scale is pretty  close as at 1:25 to equal 3.7"pitch
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 304 stainless  stainless steel  was available so I chose that  - load  strength is X 40 on the nylon - only down side wil be  noise & the $ cost
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 There are a wide  range of pinion [sprockts] available - I choose a 9 tooth for the engine shaft  & a 48 tootth for the paddle shaft which will provide 5.5:1 reductin  ratio 
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 Standard pinion  bore sizes are listed, so you may need to allow to bore or bore & bush  to suit your requirements - you would need access to a minature die grinder  to grind the riveted chain link pins to break the chain - a  conventional [minature] No 26 connecting links are available - just like  your bicycle chain
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 Only other  suggestion is 5 X drams of Glenfiddi something before you open the $price list  -----
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 Derek    Â 
 ---Original Message-----
From: Eddy Matthews  [mailto:paddlewheels@paddleducks.co.uk]
Sent: Saturday, 10 February  2007 8:53 AM
To: paddlewheels@paddleducks.co.uk
Subject:  Decoy


 

 
I believe I'm correct in thinking that Derek Warner    has "proper" chain and sprockets for the drive system on his model of    Decoy.... Am I right Derek?

Can you tell me where you got it, what size    the chain is, what shaft size the sprockets fit, and if it's relatively easy    to adjust the length of the chain without specialised tools?

I have an    idea for a project, but because the chain drive would be fully visible, it    needs to look "right".


     
Regards
Eddy


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[Eddy Matthews]

Thanks Derek.... My god, you weren't kidding about the price were you! I wonder if my bank manager is in a friendly mood?

[derekwarner_decoy]

Hi PD's - Eddy - depending on your actual/estimated chain loading, you could consider the NYLON version of the same pitch roller chain, which is dimensionally identical to the S/S construction

However remember some 3 years in our PD pages with PS Reliant, that the NYLON sproket on the engine/paddle shaft SLIPPED & required pinning?

Derek

[derekwarner_decoy]

chain tensioning....OK ...we all know I plan things in advance so   &  , but even @ 3.747 mm or 0.1475" pitch, at +/- the same value requires compensation

So Eddy if you go down this chained/sprocket path..... some sort of spring loaded shoe as a tensioning/pressuring device ..... could be OK  

:ohno ...I am having difficuliity with my new  :computer being this BLOODY VISTA thing   - Derek