Templot Club Archive 2007-2020
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posted: 1 Oct 2012 12:37 from: James click the date to link to this post click member name to view archived images |
Hi, Does anyone have a cross section of bullhead track with either the prototype or P4 dimensions marked on it? The only one I can find online is an old picture but the reolution is too poor to make out the measurements! Thanks in advance, |
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posted: 1 Oct 2012 13:00 from: David R
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Something like this? | ||
| Attachment: attach_1509_2065_rail-sections.pdf 699 | |||
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posted: 1 Oct 2012 13:15 from: Brian Nicholls
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Hi James, Hope these help. See attached PDF file of P4 Standards Bye the way, you can see the full size of the image below, on the image gallery (see button at to of screen) All the best, Brian Nicholls. |
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| Attachment: attach_1510_2065_P4-standards.pdf 560 | |||
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posted: 1 Oct 2012 13:17 from: James click the date to link to this post click member name to view archived images |
Absolutely perfect! That's pretty impressive response time! Guess the measurements are in inches? Thanks very much, |
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posted: 1 Oct 2012 13:19 from: Brian Nicholls
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Hi James, Sorry about garbled message above, it should have read as follows: Hope this also helps. See attached PDF file of P4 Standards All the best, Brian Nicholls. |
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posted: 1 Oct 2012 13:37 from: James click the date to link to this post click member name to view archived images |
Thanks for that as well Brian but I was really after a cross-section of Bullhead rail which the P4 guide doesn't have. I am trying to design some CAD stretcher bars and FPL and needed to know the size in mm of different parts of the rail e.g. webbing between foot and top. I think I have now worked it out from David's prototype plan. Thanks again for responses. |
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posted: 1 Oct 2012 13:53 from: David R
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James wrote: I think I have now worked it out from David's prototype plan. Except that most model rail is NOT an exact scale reproduction of the prototype; many model rail sections have over-thick webs which affects the 20 degree fishing angles as well. Even the "same" section from the same supplier in a different material can be different sizes. |
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posted: 1 Oct 2012 13:58 from: Martin Wynne
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James wrote:I am trying to design some CAD stretcher bars and FPL and needed to know the size in mm of different parts of the rail e.g. webbing between foot and top.Hi James, Bear in mind that model bullhead rail is only a very approximate scale section. The overall dimensions are correct (except narrow SMP rail), but other dimensions may vary considerably. In particular, the web thickness is likely to be significantly over-scale. regards, Martin. |
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posted: 1 Oct 2012 14:05 from: James click the date to link to this post click member name to view archived images |
Thanks for those bits of info - it was actually the height of the webbing between the foot and top so I could work out what width of brass to use for a stretcher bar. I have worked out about 0.8mm is the gap so a width of about 0.5mm for the bar would be about right? I'll attach the CAD when I'm done so people can see what they think. |
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posted: 1 Oct 2012 14:17 from: Martin Wynne
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Hi David, It seems we posted the same thing at the same time.  Many thanks for posting the very clear CAD drawings. James, note that the FB-109 section in David's drawing was replaced with the BS-110A section in 1959 for subsequent renewals. The main difference was the inclusion of the 1:20 cant angle on the side of the head. This makes the side of the head vertical when the rail is canted, which helps to reduce wear and maintain gauge accuracy. I'm not aware of a bullhead section with such a head. Anyone? There was a further change to BS-113A section with a thicker web in 1968. regards, Martin. |
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posted: 12 Oct 2012 15:17 from: James click the date to link to this post click member name to view archived images |
I have had these CAD drawings (mentioned above) converted to etched brass parts and they arrived today - photos here if anyone's interested: http://www.rmweb.co.uk/community/index.php?/topic/62788-photo-etched-stretcher-bars-and-fpl-arrived/ |
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