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Model Railroading > Scratch building a turntable


Date: 11/13/22 17:46
Scratch building a turntable
Author: CNW

I’m proto modeling the C&NW’s line through southern Minnesota, from Winona to Waseca in the 1976 era. The Waseca roundhouse burned in the early 1950s, but the turntable was in service in my era.  To build the Waseca engine terminal, I needed a 95-foot half-through-plate-girder turntable.  I like a good modeling challenge, so I decided to scratchbuild.  I spent most of my spare time in September and October building the turntable.   The first task was drafting CAD drawings of the prototype.   The turntable is motorized using an HVAC damper motor.  I repowered the damper motor with an Atlas can motor.  The following is a photo documentary of the project.

-Dennis
 
Photo 1: The pit walls were built using ½” cabinet plywood, sawing the round shapes with a jig saw with a fine tooth blade.

Photo 2: TO puts videos after photos, so things are a bit out of order.  This shows the pit wall after painting.  The pit floor was made using light weight spackling.  A donut shaped PC board was made and is mounted in the center of the pit.  The PC board is used to get track power to the rails.

Video 3: The pit wall has a layer of joint compound on it to simulate the concrete.  I used the motor drive to make a rotary trowel to shape the joint compound.  This process also helped keep everything concentric.

 



Edited 1 time(s). Last edit at 11/13/22 17:58 by CNW.



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Date: 11/13/22 17:46
Re: Scratch building a turntable
Author: CNW

Photo 4: This shows the ½” plywood turntable core.

Photo 5: The four rollers at the corners of the table are dummies.  Modified freight car trucks are mounted under the core and provide solid support on the circle rail.  The flanges were removed from the wheels.

Photo 6: Brushes on the bottom of the table contact the donut shaped PC board at the center of the pit to supply track power to the rails.  A Digitrax AR-1 automatic reverser keeps the polarity aligned with the connecting tracks.
 



Edited 1 time(s). Last edit at 11/13/22 17:49 by CNW.








Date: 11/13/22 17:46
Re: Scratch building a turntable
Author: CNW

Photo 7: The bridge structure and details were built from sheet styrene. 

Photo 8: If I counted correctly, I applied 5,111 Archer rivets to the model.

Photo 9: This shows the ties and deck boards being installed.
 



Edited 1 time(s). Last edit at 11/13/22 17:52 by CNW.








Date: 11/13/22 17:46
Re: Scratch building a turntable
Author: CNW

Photos 10: The finished turntable.  I used Envirotex to make the water in the turntable pit.  The operator interface, a 3-position center off momentary toggle switch, is shown in the bottom left corner of the photo.

Photos 10 & 11: The finished turntable.
 



Edited 2 time(s). Last edit at 11/13/22 18:26 by CNW.








Date: 11/13/22 18:00
Re: Scratch building a turntable
Author: wabash2800

Dennis:
Thanks for sharing. That's great work as usual. It's nice to see rails in the pit, not like the Walthers turntable. And that's great that you used the decal rivets, something that I like doing on rolling stock and structures too. Perhaps some us would be interested in how the turntable is operated with the three position switch? And a video?

Victor B/.



Edited 2 time(s). Last edit at 11/13/22 18:02 by wabash2800.



Date: 11/13/22 18:11
Re: Scratch building a turntable
Author: TomG

I'm speechless. Thats Master Model Railroader quality. I envy your skills.

Tom
Weaverville, CA



Date: 11/13/22 18:21
Re: Scratch building a turntable
Author: TomG

I was caught up with the photos and didn't watch the video. Your rotary trowel is genius.

Tom
Weaverville, CA



Date: 11/13/22 18:29
Re: Scratch building a turntable
Author: DKay

Work of art Dennis. Amazing work.
Regards,dK 



Date: 11/13/22 19:31
Re: Scratch building a turntable
Author: atsf121

I am speechless, that is just flat out amazing modeling!

Nathan



Date: 11/13/22 19:57
Re: Scratch building a turntable
Author: icancmp193

A big WOW!

TJY



Date: 11/13/22 19:58
Re: Scratch building a turntable
Author: Frisco1522

Beautiful job!  I've scratchbuilt a couple because nobody had the 100' length I needed.  You did good.



Date: 11/13/22 22:27
Re: Scratch building a turntable
Author: Coalca

Dennis's work is the best of the very best. 



Date: 11/14/22 05:01
Re: Scratch building a turntable
Author: sp8192

As usual with your stuff...WOW!   Incredible modeling!  Over 5,000 rivots added individually is just craziness, but the finished product was worth it!  



Date: 11/14/22 07:11
Re: Scratch building a turntable
Author: CNW

Thank you to everyone, for the complimentary comments!

sp8192 Wrote:
-------------------------------------------------------
> Over 5,000 rivots added individually is just craziness,

The rivets were actually applied in strips of 1-3 inches.  Only a few were applied in groups of two, but yes still crazy.

Dennis

 



Edited 1 time(s). Last edit at 11/14/22 08:35 by CNW.



Date: 11/14/22 19:37
Re: Scratch building a turntable
Author: kingwestinghouse

That is KILLER. Nice work

Posted from iPhone



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