Templot Club Archive 2007-2020
|
|||
| author | remove search highlighting | ||
|---|---|---|---|
|
posted: 27 Jun 2010 21:44 from: julesmwatson click the date to link to this post click member name to view archived images |
I've been trying to make a custom point based on the attached information. I'm not having a lot of success... Can you point (no pun intended) me in the right direction? 1896_271341_550000000.jpg  (edit: click the image to see it full size -- don't let your browser resize it to fit. Also available in the Image Gallery.) Apart from the rail positioning, I've also tried to replicate the sleeper spacing and arrangement - again with no success. Can the sleeper arrangements featured in the attached design be achieved in Templot, or is this a "bridge too far"? Cheers, Julian |
||
|
posted: 29 Jun 2010 20:47 from: Alan Turner
click the date to link to this post click member name to view archived images |
This is quite a simple operation but what is the track gauge? Alan Assuming it is 5' - 3" see below. |
||
| Attachment: attach_813_1156_Aus_Turnout.box 268 | |||
| Last edited on 29 Jun 2010 21:07 by Alan Turner |
|||
|
posted: 30 Jun 2010 01:04 from: julesmwatson click the date to link to this post click member name to view archived images |
Hi Alan, The prototype track gauge is 5'3", as you have assumed. I'm modelling in 18.2mm (EM gauge). Jules |
||
|
posted: 30 Jun 2010 05:53 from: Martin Wynne
click the date to link to this post click member name to view archived images |
julesmwatson wrote: The prototype track gauge is 5'3", as you have assumed. I'm modelling in 18.2mm (EM gauge).Hi Jules, EM gauge normally implies a scale of 4mm/ft. To model this turnout exactly in 4mm/ft scale requires a track gauge of 21mm. At 18.2mm track gauge the lead length of the turnout will be significantly shorter and it will be impossible to match the number and spacing of the timbers. Likewise the space between the V-crossings in the crossover will be significantly longer and will require extra timbers. Alternatively you could model 5ft-3in gauge at a scale of 3.467mm/ft to get an exact scale track gauge of 18.2mm and model the turnout exactly to the drawing. That's very close to H0 scale (3.5mm/ft) which strictly requires 18.4mm track gauge, but at 18.2mm gauge most of the timber spacings could no doubt be preserved as you require. Perhaps you could clarify which scale you are using? Rather unusually this drawing shows a mix of machined flares on the wing rails and bent flares on the check rails. On a modern design that might suggest a cast crossing (frog), but I think that would be unlikely for the date of the drawing (1938), and also the drawing appears to show separate point and splice rails at the vee, although the scan is not very clear. To replicate the mixed flares in Templot would require splitting the check rails out to a separate partial template. Hi Alan, Thanks for your quick stab at the design in 7mm/ft scale. Using a UK-pattern curved C switch from the BS-110A/BS-113A inclined FB series is inventive, but I think the drawing shows a 13ft-6in (162") straight loose-heel switch. Full switch details are not shown on this drawing, but from the points deflection angle given (1deg,55',1.0''), the heel offset would be 5.3/8" (5.375"). A custom switch should be possible based on this. The timber spacings shown for the switch imply that the points (blade tips) are in fresh air overlapping the toe timber by 1". This would be an unusual arrangement, but no doubt photos could confirm it. Also for the most part the timbering is shown ends-in-line (real > timbering > timber ends in-line menu item), i.e. not centralized as in your file. regards, Martin. |
||
|
posted: 30 Jun 2010 10:58 from: julesmwatson click the date to link to this post click member name to view archived images |
Hi Martin (and Alan), My apologies - I had forgotten that I was posting on a UK based site. I’ll not be so careless in the future. As already mentioned, the Victorian Railway (VR) broad gauge is 5’3” (ie the same as that used in Ireland - which is no accident, but that is a story for another day). I’m modelling in HO scale, but using a more prototypical gauge of 18.2mm (rather than 16.5mm). While the ‘correct’ gauge for HO scale of 5’3’ is actually 18.375mm, I’ve opted for 18.2mm for various reasons. To answer your technical questions regarding machined versus bent flares on the check rails; the two designs below (hotlinked) suggest that they were all bent (as would be expected for the stated year of design). It will also be noted that these designs seem to confirm that the tip of the point blades are indeed in fresh air, overlapping the toe timber by 1". Consultation of photos also suggests this to be so. http://www.victorianrailways.net/infastuct/aa_fseries/f267a.jpg http://www.victorianrailways.net/infastuct/aa_fseries/f310a.jpg Thanks you also for the tip for straitening up the timbers. I’ll jump on Templot tonight and see what I can come up with. Regards, Julian |
||
|
posted: 30 Jun 2010 11:04 from: julesmwatson click the date to link to this post click member name to view archived images |
Oh dear. I’ve just looked again and the two additional designs do not suggest that the flares were bent – in fact they show both machined and bent (like the design in the initial post. For simplicity, I will use all of the wing rails to be bent in my Templot design and modify them during construction. Jules |
||
|
posted: 30 Jun 2010 11:47 from: julesmwatson click the date to link to this post click member name to view archived images |
Alan, Thanks also for your design. I didn't see it until now. Jules |
||
|
posted: 30 Jun 2010 11:52 from: Martin Wynne
click the date to link to this post click member name to view archived images |
Hi Jules, Many thanks for the additional info. But more specifically, thanks for the link to this site: http://www.victorianrailways.net and the list of F series drawings at http://www.victorianrailways.net/infastuct/infastructhome.html many new ones of which have been added today.  Some of these are extremely detailed -- look for example at the drawing for this Permanent Way Tool Shed: http://www.victorianrailways.net/infastuct/aa_fseries/F346c.jpg (don't let your browser auto-size it). regards, Martin. |
||
|
posted: 30 Jun 2010 12:08 from: julesmwatson click the date to link to this post click member name to view archived images |
Hi Martin, Yes, Mark Bau's web site (http://www.victorianrailways.net) is excellent. I'm not sure about the UK railways but the VR had a standard for everything. Possibly even a standard for their standards...? Jules |
||
| Please read this important note about copyright: Unless stated otherwise, all the files submitted to this web site are copyright and the property of the respective contributor. You are welcome to use them for your own personal non-commercial purposes, and in your messages on this web site. If you want to publish any of this material elsewhere or use it commercially, you must first obtain the owner's permission to do so. |