Templot Club Archive 2007-2020                             

topic: 98Single slips in 00 gauge
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posted: 24 Jun 2007 23:49

from:

Peter Salathiel
 
Bangkok - Thailand

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Hi Martin,

I have followed your excellent (written) tutorial and succeeded in making templates for #7 and #8 single slips in 00-SF using GWR B-7 and B-8 crossings in Templot 91a. However, on the slip side of the crossing the elbows impinge the slip road.

How do I correct this?
I have read the Help Notes re: fixed and loose diamonds but have no idea as to how to fix the problem and am puzzling over the dialog box: real > Kcrossing options > Kcrossing check rails.
I have fooled around with several values but nothing seems to change.

Could you pleae provide some advice as to how to go about fixng the overlap and some suggested values for the items in the dialog box?
Many thanks.


BTW: Does anybody have any advice as to which order the various rails should be laid for successful construction?
Best Regards
Peter

posted: 25 Jun 2007 01:42

from:

Stephen Freeman
 
Sandbach - United Kingdom

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I presume you mean the K sngle check rail is overlapping the slip rail? If so you need to alter the size 2 to about 140 inches I would think. There are 2 ways of doing this if I remember correctly, directly and you can also give a negative value to either DS or MS. It's a while since I did one, normally I just do them to fit, just depends on how the mood takes me.

I have a 7mm FS one on the desktop at the moment -  see image for values.

 

The easiest order is to work from the inside out.

 
Peter Salathiel wrote:
Hi Martin,

I have followed your excellent (written) tutorial and succeeded in making templates for #7 and #8 single slips in 00-SF using GWR B-7 and B-8 crossings in Templot 91a. However, on the slip side of the crossing the elbows impinge the slip road.

How do I correct this?
I have read the Help Notes re: fixed and loose diamonds but have no idea as to how to fix the problem and am puzzling over the dialog box: real > Kcrossing options > Kcrossing check rails.
I have fooled around with several values but nothing seems to change.

Could you pleae provide some advice as to how to go about fixng the overlap and some suggested values for the items in the dialog box?
Many thanks.


BTW: Does anybody have any advice as to which order the various rails should be laid for successful construction?
Best Regards
Peter

Attachment: attach_30_sslip.jpg 449

posted: 25 Jun 2007 06:10

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Peter Salathiel wrote:
I have followed your excellent (written) tutorial and succeeded in making templates for #7 and #8 single slips in 00-SF using GWR B-7 and B-8 crossings in Templot 91a. However, on the slip side of the crossing the elbows impinge the slip road.
Hi Peter,

The problem here is the wider than scale flangeways. Even the prototype has problems with clearance -- the ends of the K-crossing check rails have a little machined off the top, so that as the slip road rail wears, overlapping wheels do not strike and dislodge the check rail. The wider than scale flangeways in 00 and EM just make matters worse. But fortunately differential rail wear is one factor we don't need to worry about in models.

There are three options -- shorten the check rails, or flatten the slip curve away from them (or both), or alternatively change to a switch-diamond (movable K-crossings). The latter would look odd and non-prototypical on slips of 1:8 or shorter, but may be the best option in a fiddle yard.

Flattening the switch curve is done by using shorter switches in the slip, i.e. for the 1:7 slip use the slip switch intended for 1:6 slip, for the 1:8 slip use the slip switch intended for 1:6 or 1:7 slip (which will require shortening the 1:8 V-crossing check rails). The 1:6 slip switches are 1:24 deflection (equivalent to an A switch), so this is not recommended for running lines, or if the slip is on a curve.

Shortening the check rails means entering modified dimensions at | real > K-crossing options > K-crossing check rails... | menu item. The help buttons explain each dimension. Here are some suggested dimensions for a 1:7 single slip in 00-SF using 1:24 slip switches. The dimensions showing in blue are the ones which have been modified from the defaults:

k_check_mods_ds.pngk_check_mods_ds.png

k_check_mods_ms.pngk_check_mods_ms.png

Note that for a single slip it is necessary to modify only one of the check rails. That means reducing the diagonal-side (DS) half-check rail on one half-diamond, and the main-side (MS) half-check rail on the other. For the example shown I reduced each end by 39", and to help maintain checking I reduced the flare length to only 27". Here is the result:

slip_mods.pngslip_mods.png

You can see that there is still a slight conflict, but easily dealt with during construction with a few strokes of the file. These compromises are the price to be paid for not using P4. :( It's much worse in 00-BF or 00/H0 of course.

You could try moving the slip switches a little closer to the V-crossings, but bear in mind that the points (switch tips) must be supported on a timber, must have room to open between the wing rail fronts, and the V-crossing check rails must be long enough in front of the crossing to check it properly.

There is a video showing how to create a slip in 082d. This has some new functions which simplify the written tutorial (which was for for 078e). The video is at:  single slip video .

I have a development version of Templot in which the check rails can be modified visually by mouse action, but I can't say when it will make it into a pug.

regards,

Martin.


posted: 26 Jun 2007 05:04

from:

Peter Salathiel
 
Bangkok - Thailand

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Thanks Borg.

My beginner's mistakes were as follows:

1) Not realisng that there are two very different "Help" buttons in Templot, namely the "universal" and the "specific". Having clicked on the one (the Universal) I missed the other! I also did not realise that the help buttons in subsequent dialog boxes were all specific to the entry....:(

2) Not ensuring the relevant half-diamond was the current template before changing the numbers....:(

3) Not realising that the K-crossing check rail on the slip side has zero flare (see David Smith's book figure 29)....:(

But now...albeit a couple of days later I have a fantastic template :D

Regards

Peter

 

 

posted: 27 Jun 2007 01:09

from:

Peter Salathiel
 
Bangkok - Thailand

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Hi Martin,
Thanks for that. Now I realise why people rave over P4! Too late for me though. Maybe in my next life...

For what it's worth I had played the video to start with but, not understanding what was going on, put it on one side in favour of the text lesson. The two combned make it easy for neophytes like myself, to better understand Templot and to produce excellent templates.
I must admit though that I found it difficult to follow the 'loop' in the text instructions due to lack of space on a 15" screen and so many times unwittingly missed a line (or two!). In the end I re-wrote the instructions in full, omitting the 'loop' and printed them out.
Bingo! Now the video is easy to understand and great templates the norm.
Many thanks
Peter



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