Templot Club Archive 2007-2020
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posted: 11 Apr 2010 16:15 from: Hayfield
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Sorry for being so thick but could someone please explain the difference between the geometrical radius, the switch radius and the turnout radius (which happens to be the minimum radius?), I thought the geometrical radius was the raduis the turnout would fit into, am i right, thanks in advance | ||
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posted: 11 Apr 2010 16:49 from: Martin Wynne
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Hayfield wrote: could someone please explain the difference between the geometrical radius, the switch radius and the turnout radius (which happens to be the minimum radius?), I thought the geometrical radius was the radius the turnout would fit into, am I right, thanks in advanceHi John, The switch radius (yellow) and the turnout radius (green) are the actual radius in different parts of the rails: semcu_sw.gif  You are right, the external geometrical radius is also known as the substitution radius, and is the radius of a continuous curve the entire turnout road could be fitted into. It's the radius normally quoted by manufacturers of commercial turnouts. The rails don't actually follow this curve exactly because of the effect of the switch deflection angle, and the different types of V-crossing. There is a video explaining substitution radius at: http://www.templot.com/martweb/videos/subs_rad.exe The internal geometrical radius is also quoted for complete information. It represents the "average" radius up to the nose of the vee only. It is useful when matching a custom turnout design to some older types of pre-grouping, industrial and narrow-gauge turnouts. regards, Martin. |
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