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posted: 1 Mar 2012 05:28 from: Ewerthon Mota click the date to link to this post click member name to view archived images |
I´m looking for the longest bullhead rail turnout ever used on a standard gauge railway, as I wish to model it. Looking on internet I didn´t find much, however I found this interesting discution going http://www.rmweb.co.uk/community/index.php?/topic/39955-20-turnout-in-ho-gauge/ There was made a longer than f20 turnout? There´s standard G turnout? I just found from A to F. What´s the chair types needed to make this turnout? It will be for display, not part of a layout. |
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posted: 1 Mar 2012 16:30 from: Martin Wynne
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Ewerthon Mota wrote: I´m looking for the longest bullhead rail turnout ever used on a standard gauge railway, as I wish to model it.Hi Ewerthon, The G and SG switches and the G-28 turnout were flat-bottom designs by the SR. The longest standard REA bullhead turnout is F-20. You can print a template from Templot. That is not to say that someone somewhere has not built something longer in bullhead, but I have never seen any details of such. Modern FB turnouts go much longer, of course. The chair details for F-20 and all REA turnouts are are as below. copied from: http://www.templot.com/martweb/templot_forum.htm Apologies for the poor quality of the very old scans, it is time I updated them. regards, Martin. Here is some chairing info for bullhead crossings and REA switches : xing_chairs.gif These are the special chairs used at the crossing. The X,Y,Z chairs count back towards the switch; the B,C,D, etc. chairs count out beyond the crossing. The A chair is always under the nose of the vee. Where no special chair is shown in this table standard chairs are used, or sometimes bridge chairs where space is tight. The indistinct dimensions in the notes are 4in, 2ft 6in, 2ft 0in (the latter is for the rail joint). All chairs are central on their timbers, so these dimensions are also the timber spacings. rea_chairs.gif These are the special chairs used for REA semi-curved switches. The numbers are the total for the whole switch, i.e an A switch has 5 P chairs per switch blade. P chairs are the ones on which the switch blade slides and to which the stock rail is fixed by means of a bolt through the rail web instead of a key. Block chairs come next and hold the both the switch blade and stock rail at the correct spacing (these are handed and numbered 1,2,3 etc.). The bolts and distance blocks fit between the rails to keep everything secure. So for a B switch each side has (counting from the rail joint) : 2 standard chairs in front of the switch toe, 6 slide chairs, 4 block chairs, Standard chairs and bridge chairs are then used as space on the timbers permits. PJ chairs are a later design in which the outer jaw is in the form of a separate spacer block, similar to flat-bottom slide baseplates. |
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posted: 2 Mar 2012 17:30 from: Ewerthon Mota click the date to link to this post click member name to view archived images |
There´s a place where I can draw this chair to print on a 3d printer? There isn´t many chair types in S scale. I´ll be disponibilize it for free in forum for everyone, in every scale. I have never seen F G H J Z and Z1 chairs and don´t have much idea how they are. | ||
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