Templot Club Archive 2007-2020                             

topic: 967Two questions regarding two design concerns
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posted: 1 Nov 2009 02:52

from:

William Adkins
 
Oregon USA

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As I work through my layout design I've encountered two issues for which I could use  advice:

1. I would like to make a right hand curved turnout. The outer radius would approximate 32" while the diverging radius would be 30". Is there a way to set each track's radius and then  have Templot calculate the  appropriate frog ratio, i.e. 1:10, 1:12, etc. for a defined scale and gauge?

2. Is there such a thing as an asymetrical wye turnout? As an example, a right hand diverging track at 32" radius and a left hand diverging radius of 30". If so, how would one create such a template using Templot?

Thank you in advance for your help.

Bill

posted: 1 Nov 2009 03:28

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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William Adkins wrote:
1. I would like to make a right hand curved turnout. The outer radius would approximate 32" while the diverging radius would be 30". Is there a way to set each track's radius and then  have Templot calculate the  appropriate frog ratio, i.e. 1:10, 1:12, etc. for a defined scale and gauge?
Hi Bill,

What you do is first set the required outer radius. Then adjust the turnout size (V-crossing angle / frog ratio) using the F5 size mouse action, until the desired inner radius shows in the information panel as the substitution radius:

00_b5_geo.png00_b5_geo.png


Note that the actual radius in the rails is likely to be smaller than this. If that's important, watch the minimum radius now box instead.

There is more about all this, and a video link, in this topic:

topic 397

Is there such a thing as an asymetrical wye turnout? As an example, a right hand diverging track at 32" radius and a left hand diverging radius of 30". If so, how would one create such a template using Templot?
Yes, exactly the same way as above, just set the outer radius to -32" (negative) before you start.

There is detailed tutorial on Y-turnouts. Sorry it's a bit out-of-date, but the basic principles remain the same:

http://www.templot.com/martweb/y_symm.htm

There is an update at:

topic 603

regards,

Martin.

posted: 5 Nov 2009 22:16

from:

Bill Adkins
 
Bend - Oregon USA

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Martin:
Thank you for your informative reply. I followed your suggestions and have reviewed several tutorials and previous posts in the Templot Club. I'm nearly there.

Two new questions, however:
1. Would it be possible in a future release to have the ability to change the spacing of all ties in a turnout at one time versus the need to "shove" ties one at a time? My prototype uses ties spaced at 22" though out the length of the turnout as well as for plain track.
2. Under switch options I notice there is an option "BH or FB 1:40 non-protoptype short model switch." This appears to be a compression of prototype engineering but I am unfamiliar with the terminology. Would you please explain?

Again, thank you.

Bill

posted: 5 Nov 2009 23:28

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Bill Adkins wrote:
1. Would it be possible in a future release to have the ability to change the spacing of all ties in a turnout at one time versus the need to "shove" ties one at a time? My prototype uses ties spaced at 22" though out the length of the turnout as well as for plain track.
Hi Bill,

You don't have to shove the timbers one at a time, or at all. You can set the timber spacings to whatever you want.

However, you can't do it for the whole turnout in one go. You must set the spacing for each part of the turnout separately. Assuming you are using Templot version 091c:

1. The timber spacings for the switch section are part of the custom switch settings. There is more about this at:

topic 392 - message 2344

2. Between the heel of the switch and the wing rail joint at the V-crossing (frog), the spacing is set at real > timbering > timbering data... menu item -- "fill timber spacing" input line.

The dimension you set there is actually a maximum -- Templot may need to reduce it slightly to fit a whole number of timbers in the space available.

For the timbers under the V-crossing (frog):

3. The spacings under the wing rail front are set at real > customize V-crossing > wing rail front... menu item -- "timber spacing for wing rail front" and "timber spacing at wing rail joint" input lines.

4. The spacings under the vee rails are set at real > customize V-crossing > vee rail... menu item -- "timber spacing for vee rail" input line.

If you set 22" for all these settings, you won't have to do any timber shoving.

This spacing combined with the number of timbers spanned, sets the position of the wing rail joint and the length of the vee rails. Click the "? help F2" flag on each input line for further details.

regards,

Martin.

posted: 6 Nov 2009 10:28

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Bill Adkins wrote:
2. Under switch options I notice there is an option "BH or FB 1:40 non-prototype short model switch."
Hi Bill,

First of all make sure you understand that when Templot, or anyone in the UK, including me, says "switch" we mean only the moving points section of a turnout. Not the whole thing. I know this can be very confusing for users on the left side of the pond. :)

The non-prototype short model switches allow you to save some space when using sub-natural turnout sizes. For the natural REA sizes -- A7, B8, C10, etc., changing to the short model switches will make little difference.

Sub-natural sizes are those where the V-crossing angle is shorter than those above, for the same switch size, i.e. A5, A6, B6, B7, C8, C9, etc.

In these cases, changing to the short model switches will shorten the turnout. In these short model switches the switch heel is set at the end of the planing (blade machining), and the turnout curve starts immediately from there.

In most prototype switches, the heel position (where the turnout curve starts) is either at the physical end of the switch rail (point rail, point blade, tongue rail) or at a virtual heel position where the heel offset (heel spread) provides a flangeway clearance behind the open switch rail.

So I called these short model switches "non-prototype". However, there are some narrow-gauge and industrial turnouts which do match this design. But in such cases it is probably better to make a full custom switch from the prototype data.

The non-prototype short model switches are in the list at template > switch options... menu item (version 091c).

regards,

Martin.



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