Messages From digitrax

 


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#119686 Oct 8, 2007

--- In Digitrax@yahoogroups.com, "jules1935" b_buck@...> wrote: >

> Today I ordered the Super Chief, 80' of code 83 flex track, PSX, Magna > Force 615 PSU from Tony's. I completed the outer main line track. I

> may use it on a temporary basis while setting up the inner. The yard

> lead and AD tracks will be added after I get my Fast Track turnout

> kit, they take a few weeks.

> Now the question?

> Would it not be better to cut double gaps on the other side 180

> degree's from the command station and use a terminal strip to branch

> out left and right. Having two ends for the track bus. Sorta like a Y > shaped like a drooping willow tree. OR just go around. Later on the

> inner and outer main will be a power subdistrict and the yard area

> another. I'll have to purchase another PSX of course. So far it's

> really just a big circle. Using no# 12 THHN stranded with 18AWG

> feeders, two feeders for each flex piece . Probably over kill but who > knows.

> On another note. I figured out a way to make dynamite transitions.

> Couldn't find a thin stick, I used the tip end of my fishing pole,

> heck it makes a transition when you bend it. Only about 15-20 degrees > are actually 24" on a 90 degree sweep. I just used a 1/2 inch offset

> to the tangent, looks great, if I may say so myself.

>

> Your a great bunch of guy's, thanks for the help!

>

> Jules

>

Do I need gaps at all?

Thanks again.

Jules



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#119697 Oct 8, 2007

Jules:

Do I need gaps at all?



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Not for a simple oval of track.

But remember that gaps have two purposes: (1) for electrical reasons and (2)

to leave a gap to counter the expansion and contraction of the rail due to

changes in temperature.

Peter



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#119699 Oct 8, 2007

Jules,



You need gaps at the boundaries of you power districts. If any trackage

crosses the middle of your oval letting the train change direction it needs

double gaps at both ends and a reversing loop controller. Beyond that every

say 6 feet or so should have non-soldered regular joiners for expansion.



Often the power districts you plan aren't to disseminate power but to create

isolated fault zones so a derail short in a yard doesn't also halt the main.



Phil Agur - my

---Links-Are-Forbidden--- NTrak Odds & Ns

---Links-Are-Forbidden--- Capitol City N-Trak - All DCC - Sacramento,

CA

Mid Century N- California - SP, WP, SF, UP, TWS, and others.



-----Original Message-----

From: Digitrax@yahoogroups.com [mailto:Digitrax@yahoogroups.com] On Behalf

Of jules1935

Sent: Monday, October 08, 2007 12:43 AM

To: Digitrax@yahoogroups.com

Subject: [Digitrax] Re: A question II

Do I need gaps at all?

Thanks again.

Jules



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#119707 Oct 8, 2007

In a message dated 10/8/2007 9:17:31 A.M. Eastern Standard Time,

PWhiteMR@... writes:

Jules:

Do I need gaps at all?

---------------

Not for a simple oval of track.

But remember that gaps have two purposes: (1) for electrical reasons and (2)

to leave a gap to counter the expansion and contraction of the rail due to

changes in temperature.

Peter



From all that I have read on this list it is not a good idea to have a pair

of electrical loops for DCC. Having said that. Double gap the track in some

convenient place and do not form closed loops with your pair of bus wires.

Rick



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