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PostPosted: Wed Aug 20, 2008 6:15 pm 
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Joined: Fri Feb 22, 2008 2:29 am
Posts: 7
Location: Sydney, Australia
I need to find the Rail Head Width for HO Scale Peco Code 75 Rail in Thousandths of an Inch.

Does anyone know this dimension or know of a site that may have this information?

Cheers

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PostPosted: Thu Aug 21, 2008 1:24 am 
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Peco Code 75 Railhead width = 0.031"

There's a chart floating around this site somewhere that lists a bunch of common rail sizes and manufactures' with their corresponding sizes.


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PostPosted: Thu Aug 21, 2008 7:04 am 
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Location: Melbourne, Australia
The thread is located at here. I posted the sizes according to the manufacturers specs, and the table ( by emccamey )was made from actual measurements taken. So there is a slight difference in some of the dimensions.

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PostPosted: Thu Aug 21, 2008 11:48 am 
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Joined: Sat Aug 13, 2005 10:48 am
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Location: East Texas - USA
Manufacturing processes will have some variance of any product. For model rail, the process will vary by usually about +-/ 0.001" or so. Molds, dies, and forming rollers will wear as production continues, and eventually a new set of production tooling is required. Sometimes, new tooling (or using a different actual supplier) will have a new design that makes the dimensions stray slightly further off. Depending on what you need to do with the dimensions, make allowances for the variance. Making track gages for a specific rail head - allow about 0.003" extra for variance and clearance to prevent binding. Remember your final track gauge has a fairly wide allowance for acceptable operations. Setting a minimum track gauge with rail head slots slightly wider for use will not affect the final application as to conformance.

For setting a track gauge - you will want the setting specification to be very close to the minimum for your scale and have the design allow for only modest gauge widening in compressed curvature. Most all the standards allow far too generous gauge widening specifications.

-ed-

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PostPosted: Thu Aug 21, 2008 7:15 pm 
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Joined: Fri Feb 22, 2008 2:29 am
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Location: Sydney, Australia
Thanks for all the info guys it's greatly appreciated.

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