Templot Club Archive - Search Results
To search again, click the Back button in your browser.
Search results for: 2_050420_590000000.png
6 results found.
... It is in fact a short length of curve, and a slight twist is introduced in the rail over the length of the curve so that the canted wing rails can lie level. They should be fractionally above the level of the vee nose to allow for the coning angle on the wheels, but that is done by removing metal from the vee top** (3 /16" at the tip, running out in 15"). See the section through the knuckle in this diagram of an REA bullhead crossing: 2_050420_590000000.png On GWR crossings, the knuckle radius matches the crossing angle in feet. So a 1:10 crossing has a 10ft radius at the knuckle, and so on. On REA crossings (diagram above) the knuckle gap is specified instead, and the rail is curved to a knuckle radius accordingly. For a 1:10 crossing, the knuckle gap is 2.5/32" (i.e. the knuckle gap is wider than the normal flangeway gap of 1.3/4 "). Here's a pic showing an almost as ...
... , attach it then paint everything. That will take a little while. posted: 18 Jan 2018 22:43 from: Martin Wynne Hi Andy, That's looking very good. Well done. I'm a bit disappointed that you didn't include the spacer blocks in the crossing, and bolt heads on the rail. Moulding the rails and chairs in one piece gave you an opportunity to go one step beyond other systems and do that. Maybe for the next test shot? Here's a pic again showing the spacers and bolts: 2_061131_520000000.jpg 2_050420_590000000.png Of course, they would need to be deeper than scale to allow for model wheel flanges. cheers, Martin. posted: 19 Jan 2018 02:12 from: Andrew Barrowman All in good time Martin The primary objective at the moment is to see if the method actually works. Mind you, it's surprising what you can actually do with 3D printing. Some things would be very expensive if not impossible with injection molding, but you would know a lot more about that than me. Now I must to the workshop ...
... -- the NER for example. On the GWR the curve matches the crossing angle in feet, so for example a 1:7 crossing has the knuckle bend curved at 7ft radius. But it's important to get the flangeway gap correct alongside the nose of the vee at X in the diagram, otherwise there is a risk of wheels dropping into the gap in front of it. What you must not do is make the knuckle bend too sharp, as shown by the red line. This is guaranteed to cause problems. 2_050420_590000000.png p.s. Here's a diagram of bullhead rail section, with the thicker edge on top. 2_130841_170000000.png If you have trouble identifying the top edge, try pressing the rail end into a bit of Blu-Tack (or Cheddar cheese) and looking at the impression left. Nowadays for me at least it is easier to see the rail section that way than looking directly at the rail. (40 years ago when I was building track commercially, I could identify the rail just by feel.) The idea of reversing bullhead ...
... -- the NER for example. On the GWR the curve matches the crossing angle in feet, so for example a 1:7 crossing has the knuckle bend curved at 7ft radius. But it's important to get the flangeway gap correct alongside the nose of the vee at X in the diagram, otherwise there is a risk of wheels dropping into the gap in front of it. What you must not do is make the knuckle bend too sharp, as shown by the red line. This is guaranteed to cause problems. 2_050420_590000000.png regards, Martin. posted: 22 Nov 2015 22:26 from: DerekStuart Thanks Martin. That is really good of you to post that, although I have seen that before (linked from your 00-sf thread). I will go back to it tomorrow and measure as you have suggested. I am aware of those facts (the 00sf/4sf threads explained it quite well) which is why I am puzzled what I have done wrong. I will re-measure it. Thanks Derek posted: 4 ...
... how the connecting tracks align we may be able to find a better solution. For the chairs, the best way is to study an Exactoscale template from C&L. If you are a member of the Scalefour Society you can download some of them from the Society's web site and zoom in to see all the chairing detail round the crossings and switch heels. Here is a drawing showing the basic arrangement for crossings. You can see that an L1 bridge chair is used where there isn't room for a standard S1 chair: 2_050420_590000000.png The "A" chair under the nose of the vee is normally built up as a "slab& bracket" chair with a bolt through the assembly: 2_061131_520000000.jpg Thanks to Mick Nicholson for this pic. The ends of a check rail have special angled chairs to create the flared ends. regards, Martin. posted: 13 Dec 2016 02:23 from: gibbard d cheers for the advise/ instruction. I see what you mean about the v crossing style="background-color: rgb(255, 255 ...
... examples and for the printout to reflect this option. Regards, Chris posted: 14 Jan 2017 14:55 from: Martin Wynne ChrisBr wrote: As I understand it (early) GWR Wing Rails were radiused according to the angle of the crossing Hi Chris, Not only GWR -- all* knuckle bends are radiused, with the result that the knuckle gap is wider than the flangeway gap. See the "knuckle gap" figures in the table of crossing data at: http://templot.com/martweb/templot_forum.htm 2_050420_590000000.png Some prototypes have a very noticeable knuckle radius, such as the NER. This feature was missed out when I originally wrote the code for the template generator 30 years ago, and it has been on my to-do list ever since. Likewise several other similar refinements, such as the bend radius at the bent check rail flares. Of course, the templates are not and never were intended to be descriptive drawings of trackwork. They are for use as construction guides. As such, if you know there is a ...
Search took 0.090 seconds
Back to Templot Club