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Steam Bending Roof Hoops January 2010

The need to replace the curved roof supports for Auto 169 has been one of the areas that have given us much food for thought since originally discovering their poor condition when we dismantled the first sections of the carriage.

It is the one area that none of those involved had had any experience of so over the last year we have tried to research the methods performing such work and have at last reached the trial stage.

We have decided that we will use a 4 layer laminate construction of Ash and to try our hand we have produced a metal former replicating one half of the requirement which included the tightest curve of the roof shape in the area immediately above the cant rail.

Below is a video of a demonstration of steam bending of new wooden roof hoops (Nos 6 and 7) for Auto-trailer No 169 at the 2010 WSR Autumn Steam Gala  and some of the images taken on Saturday 30th January 2010 during our first attempt.

 

John Castle and Tony Brooks preparing the former The former ready to receive the steamed timber
Timber clamped in place Another view showing the many clamps required
A piece of 125mm by 14 mm Oak for use as a gluing support The first results with original (darker wood)below

 We are very pleased with the first results and will check for the amount of 'springing' of the timber once we have allowed the steamed timber to dry and then glued it. We may need to make some small adjustments to the curve to allow for the spreading.  

 

 

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This site was last updated 31-05-2012