Billy C (and Bill L),
Looks like you got a handle on it......gone thru the math, etc. The
one time the turntable diameter might be critical is if you are trying to
scale out a proto railroad setup, where you want to match up the bridge
length, and number and angle of the stalls. Did this one time based on
available turntables. Rails can get a little close, or even cross, if
roundhouse is set back too far, just as you mentioned. At one time, an
outfit called AAA Turntable made a pretty nice custom unit and would index
the table based on your roundhouse angle spec's. I think Bowser still
makes varied length tables, but as I recall, a lot of backlash on the
travel.
Gary Chudzinski
[EMAIL PROTECTED]
> From: "Billy Click" [EMAIL PROTECTED]
> Date: Fri May 26, 2006 11:38am(PDT)
> Subject: Re: possible new roundhouse
>
> From: "Bill Lane" wrote>
> > I have a mostly completed Mini Structures large S turntable that was
> > my 13th birthday present. I have never installed one, or a roundhouse
> > for that matter. In order for a roundhouse to have the tracks come
> > radially straight off the turntable, doesn't the roundhouse have to be
> > built to match the diameter of the turntable?
>
> Bill,
>
> I have a partially completed Mini Structures turnable also. (And a
partially
> completed Mini Structures roundhouse to match.) The diameter of the
> turntable is not the governing factor. (Although one would normally wish
> that the length of the longest roundhouse stall would be at least equal
to
> the diameter of the turntable but not necessarily.)
>
> The angle of the stalls to each other and the length of each roundhouse
> track from the center of the turntable to the front of the roundhouse are
> the critical points.
>
> In other words draw a line through the center line of each radiating
track
> of the roundhouse to the center point of the turntable. Then you can
> determine the distance from the edge of the turntable to the front wall,
> (engine doors), of the roundhouse. In some prototype situations, it was
not
> unusual for the radiating tracks to cross before reaching the turntable.
The
> further the distance from the edge of the turntable to the roundhouse
doors
> the smaller the angle of the roundhouse radiating tracks from each other.
> (and the opposite, the closer the roundhouse to the turntable pit the
larger
> the angle.)
>
> This is probably clear as mud.
>
> Billy Click
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