SWITCH MACHINES

[NW Modeling List]

Hi Ed:

 

I use also use the Circuitron Tortoise switch machines and have had good
luck with them.  I modified the mounting paper layout that is supplied with
the switch machine making a mounting jig with alignment tabs that keep the
jig parallel with the track.  I also spend the time and extra money using
the end connectors that Greenway Products sell making up the wiring harness
that connects to a terminal block with eight connections (radio shack)
approximately 12" away from where the switch machine is located.  The end
connector and terminal block can be made-up ahead of time and then installed
once the switch machine is mounted.  This eliminates soldering overhead
under the layout.  I have done this for more than 50 switch machines on my
layout.  I also like the Tortoise switch machine because you can set the
tension on the throw rod to the switch to get a better closure.  Each
Tortoise has two sets of internal switches one to power the frog and another
for panel indication / signals.  I run DCC and have stationary decoders for
every switch machine this keeps all of the controls in the hand held
throttle with only indication on a small panel mounted on the front of the
layout.  

 

I started with twin coils and even built power supplies with capacitors to
store the power to be able to throw more than one at a time.  When I dent to
DCC I went with the Tortoise and never looked back.   When it is all said
and done which ever works best and meets your satisfaction is all that
matters.

 

Good Luck

 

Larry Brown

 

-----Original Message-----
From: nw-modeling-list-bounces at nwhs.org
[mailto:nw-modeling-list-bounces at nwhs.org] On Behalf Of NW Modeling List
Sent: Sunday, May 15, 2011 6:36 PM
To: 'NW Modeling List'
Subject: RE: SWITCH MACHINES

 

I'll throw in my 2 cents Ed.

 

I help build, maintain and operate a large HO layout (Tom Enloe's Pacific
Northwestern). Typically I operate as yardmaster in a 12 track double ended
yard with station facilities off one end and engine facilities off the
other. I would say that there are approximately 50 switch machines in this
portion of the layout. They are roughly split between Circuitron Tortoise
machines and Scale Shops switch machines. 

 

Tortoises: Once installed, the Tortoise machines are very durable and
reliable. Care is required in the installation in order to get them centered
and set parallel to the throw of the points, but is not difficult. They are
quiet and realistically slow in operation. In the years that I have been
with this layout I have not known a Tortoise to fail. Tortoises are used in
all new construction and most of the modeled railroad has been built with or
retrofitted to them. I am also retrofitting my own much smaller layout with
them from Caboose Hobbies hand throws and would note that they are much
easier to install centered under the points as the turnout is installed (or
at least drill the hole for the throw wire) rather than retrofitting them to
the side or with bent wire mechanisms after the turnout is in place.

 

Scale Shops: These are threaded shaft motor drives where the moving dolly
throws the turnout and makes/breaks a set of contacts, some of which are
part of the motor wiring and stop the motor at the end of the throw. They
are not as precise regarding the mounting as we used all bent wire throws
which left us some adjustment after mounting. Unfortunately I do not rank
them as high in reliability. Since there is some momentum to the motor and
dolly, they can slightly overrun the cutoff point of the contacts. Then when
thrown to the other direction they just whine at very high frequency. Some
of the more senior members can't hear this whine and don't know why the
switch didn't throw. We have also had the contacts get bumped (they are
exposed) which misaligned them or pushed one contact set into another. On
one or two occasions we have had the motor come loose from the base and had
a 50/50 success rate reattaching them. Another observation is that they are
somewhat noisy for the short time they are active and don't contribute to
the realism of the layout (but it's easy to tell if they are working).

 

Twin coils: The PNW staging yard was built with approximately 20 twin coil
solenoid switch machines. I have not peeked under there to see which brand
they are. A few have been replaced but most are still working after 20 years
or so.

 

This layout has been in existence for many years and all 3 of these switch
machine types have served well. Given a choice I have gone with the Tortoise
on my layout.

 

Don Trettel

Roanoke native now living near Seattle.

 

 

  _____  

From: nw-modeling-list-bounces at nwhs.org
[mailto:nw-modeling-list-bounces at nwhs.org] On Behalf Of NW Modeling List
Sent: Sunday, May 15, 2011 7:26 AM
To: NW Modeling
Subject: SWITCH MACHINES

I sent out a note a while ago about anyone with positive experiences with
switch machines (HO).  Don't recall if anyone wrote back but if you've had
good luck installation, operation and mainteance wise would sure like some
tips.
 
Thanks!

Ed Svitil
Norfolk & Western Railway
 
  




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