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What ho Kenneth<br><br>Yes you are right. I was very tired when I wrote that. The crank, fitted to the eccentric on the driving wheels, is half the throw of the length of the piston stroke( or travel).<br><br>Best wishes<br><br>Barry<br><br><br>> Date: Thu, 16 Apr 2009 11:09:24 -0400<br>> To: nw-modeling-list@nwhs.org<br>> Subject: Re: HO scale 2-10-2 information needed<br>> From: nw-modeling-list@nwhs.org<br>> <br>> Ed,<br>> <br>> I'm sure you meant 16", right? According to a response over on the <br>> Southern list, the Spectrum throw is a scale 13.5" It seems rather <br>> common to me to see reduced stroke in models - possible to deal with <br>> over-sized crossheads and other related parts?<br>> <br>> Barry,<br>> <br>> Are you sure about the valve gear thing? I suppose it would make sense <br>> for something like a Joy VG, but most gears had their own eccentric, <br>> separate from the crank pin. The crank throw is important (for my <br>> purpose at the moment, at least) because it determines the piston stroke.<br>> <br>> Kenneth Rickman<br>> <br>> NW Modeling List wrote:<br>> > Measure from the center of the driver axle to the center of the crankpin <br>> > screw. For either of those 2-10-2s that should be (measured with a <br>> > scale rule) 32 inches.<br>> > <br>> > EdKing<br>> <br>> and<br>> NW Modeling List wrote:<br>> > Marty<br>> ><br>> > The throw of the crank pin would be the distance from the centre of the<br>> > axle to the centre of the crank pin hole. In a loco valve gear it is<br>> > related to the movement of the valves in the steam chest above the<br>> > pistons. Roughly, longer throw = greater movement of valves.<br>> ><br>> > That's how it works in the UK anyway(!)<br>> ><br>> > Barry Reeves<br>> <br>> <br>> -- <br>> Kenneth Rickman - krickman1@carolina.rr.com<br>> Salisbury, NC<br>> <br>> "Once admit that human life can be guided by reason, and all possibility <br>> of life is annihilated" - Leo Tolstoy<br>> ________________________________________<br>> NW-Modeling-List@nwhs.org<br>> To change your subscription go to<br>> http://list.nwhs.org/mailman/options/nw-modeling-list<br>> Browse the NW-Modeling-List archives at<br>> http://list.nwhs.org/pipermail/nw-modeling-list/<br><br /><hr />Surfing the web just got more rewarding. <a href='http://extras.uk.msn.com/internet-explorer-8/?ocid=T010MSN07A0716U' target='_new'>Download the New Internet Explorer 8</a></body>
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