[modeleng] Re: Going round the bend

I have forgotten too Alan, but if drawing on paper, with a pencil, if you 
can remember that far back <VBG>, then a draughtsman's French Curve is a 
very close approximation. Been there and done that on preliminary layouts, 
prior to having the design computers work out accurate line and level!

Tony Wells.


----- Original Message ----- 
From: "alan Stepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Sunday, May 29, 2005 10:11 AM
Subject: [modeleng] Going round the bend


> When going from a straight track to a curve, one should build in a
> transition curve, to make the change gradual rather than abrupt.
>
> One can get a reasonable approximation to a transition curve by using a
> series of short curves of gradually increasing radius.
> A decent CAD program will draw one, which could then be scaled, and made
> using a table of offsets.
>
> However, there is a formula to calculate transition curves which I learned
> many years ago, and, naturally have totally forgotten.
>
> Can anyone tell me what it is?
>
>
> Alan Stepney


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