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Old 8th November 2009, 14:41   #1
kaustav
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Default N scale scratch-building: Project 6: Bascule Bridge

Time to move out of the cardboard for a change! In the layout design, I will have a small entry to the port for the carfloats, barges, small cargo ships etc, and I would need a small lift bridge for that. Initially I had no intention of making a complex design and thought of making a fixed structure, but later I thought that why not take the challenge of adding a little more animation in the layout other than just trains? So I decided to make the bascule bridge an operational one and also, have the ambition of making a moving carfloat along with it's tug which will move in or out of the port during an operation session.

Well, frankly speaking this has been a different genre of challenge to me, as I have not built any operational models so far in my life. As usual, I had to look for cost effective (Or no cost-whatever you say... ) methods for this one. While grocery shopping one day, I suddenly spotted a small wooden box of a famous stick picking game-"Mikado Spiel"-with a thin wooden sliding cover-the dimension of which seemed exactly what I needed (And of course, I noticed the "Mikado" part.. ). I bought it instantly, and the design is more or less based on the dimension of the wooden strip.

The schematic design of the bridge is as follows:



I have only sketched the front view of the structure. Calculated the details of the top view in my brain...
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Old 8th November 2009, 14:53   #2
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

Just before I started building the bridge, I realized that I need a lot of thin wood beams to actually build the truss! Since I had nothing even near to the number of beams I needed, I looked around for an opportunity to improvise. Then I found these. Remains of some old wood craft model of the Statue of Liberty!



I found the workable part of these remains and cut thin wooden beams of 3mmX2.5mm from these woods:



Now I am ready for the next round!
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Old 8th November 2009, 15:00   #3
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

I started with the Leaf Truss. Here are some shots of building the first structure.



A test with a loco to see if the clearances are proper:





And then after the basic coat of paint by my wife and some added girders...

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Old 8th November 2009, 15:02   #4
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

The Tower Truss is built on a comparatively heavy wooden block (actually a pair of Jenga block glued together!). Nothing difficult to handle:

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Old 8th November 2009, 15:05   #5
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

Then the Rocking Truss. The only challenge while building a rocking truss is that it does not have any solid, fixed support. So I had to use additional supports to make it rigid. The structure is still not finished, and the first coat of paint is due...

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Old 8th November 2009, 15:08   #6
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

As of now, keeping the three structures in their respective position, it looks something like this:



Well, now the biggest challenge is to link these three pieces together. Alignment in any moving part in N scale is a challenge, especially if they involve alignment of track. Moreover I will have to power the track when it's in the down position.

I have my strategies ready, but not sure, how accurate they would be. We will discover that pretty soon I guess...
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Old 8th November 2009, 16:00   #7
RW James
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

Lookin' good!
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Old 8th November 2009, 21:42   #8
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

Good start Kaustav.
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Old 9th November 2009, 06:49   #9
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

Lookin good so far Kaustav. By the way what is a bascule bridge, and what are they used for?
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Old 9th November 2009, 07:18   #10
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Default Re: N scale scratch-building: Project 6: Bascule Bridge

Quote:
Originally Posted by JackBlack View Post
Lookin good so far Kaustav. By the way what is a bascule bridge, and what are they used for?
Thanks Jack. Bascule Bridges are a type of lift bridges-one of the primary lift bridge design that you can find... More on wiki: http://en.wikipedia.org/wiki/Bascule_bridge
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