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topic: 1103Transition Failure - can't see why...
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posted: 12 Apr 2010 15:38

from:

BruceNordstrand
 
Riverstone, NSW - Australia

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I am currently paying some track on a plan I have and have come across a problem trying to transition from a 28" curve to a straight. I have both centre lines seperate but it is failing as per the screen shot. As far as I can see this is no different from the transtion I just did! Does anyone have any ideas?

Cheers
Bruce
Attachment: attach_775_1103_Screen-shot-2010-04-13-at-12.34.05-AM.gif 108
Last edited on 12 Apr 2010 15:40 by BruceNordstrand
posted: 12 Apr 2010 15:42

from:

BruceNordstrand
 
Riverstone, NSW - Australia

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Well, I may have answered my own question in as much as I have managed to do it. I moved the peg to the near side of the curve and the transition completed.

Is this anywhere in the doco's as the error message is confusing. Purely by luck I just swapped the peg position to see what would happen.

Cheers
Bruce

posted: 12 Apr 2010 17:07

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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BruceNordstrand wrote:
Is this anywhere in the doco's as the error message is confusing. Purely by luck I just swapped the peg position to see what would happen.
Hi Bruce,

Yes it is, but perhaps not too easy to find. See para 10 at:

 http://www.templot.com/martweb/info_files/make_trans.htm

from which:

If one of the original templates was itself a transition template, the new transition will be matched to it according to the position of its fixing peg.

The same information is available within the program by clicking the geometry > transition curve > ? transition help menu item, followed by clicking the about the make transition function button.

and also at: peg/align tools > make transition curve from the control template > ? make transition help menu item.

So that's 3 separate places containing the information you were looking for. :)

The "make transition" function needs to know the radius of the template. If it's not a fixed radius template, i.e. a transition template, it uses the radius at the peg location.
 
Which further means:

If the peg is within the transition zone, the original template will need shortening to that exact position to obtain a proper match with the new template (use the do > snap to peg menu item).

What this usually means in practice is that you have to remember to swap the peg to the opposite end to make the transition, and then swap it back again to shorten the original template. Which is not user-friendly and a bit of a nuisance -- it will be changed in the next upgrade. A dialog will ask you which end of the transition template to use -- 1st radius, 2nd radius, or peg position.

regards,

Martin.

posted: 13 Apr 2010 05:33

from:

BruceNordstrand
 
Riverstone, NSW - Australia

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Thanks Martin

Understand now, that was most helpful. I always thought you couldn't transition a transition but I was wrong. I'll go try a few things out to see how they work.

Cheers
Bruce



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