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Two steps backwards

buffalo

Entry posted by buffalo

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Little to report on Loose Ends other than problems. The warping that was apparent when track laying began on the embankment module has become worse, so I will have to cut out the trackbed and replace it. Looking at the station yard module, which has sat on the shelf since the cork trackbed was glued down, reveals the source of the problem:

 

blogentry-6746-126817923577.jpg

 

Cork + PVA + foam board doesn't work. Though all appeared well after initial drying of the PVA, subsequent curing of the glue and/or contraction of the cork has had disastrous results. Both of the affected boards will need the cork section cutting out so I'm leaving this until I feel brave enough and have worked out how to ensure that the two modules will line up correctly with the bridge section. Without the cork they will be 3mm lower. Do I raise the bed on these two modules or lower the bridge by 3mm? It may just be easier to lower the bridge.

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  • RMweb Gold
Mikkel
  • RMweb Gold

Sorry to hear this Nick, but thanks for sharing so others can avoid the problem.

 

I wonder why the bridge module wasn't affected? Perhaps it had a different kind of bracing? (looking at the photo above I can't quite make out how the foam and cork was supported/braced).

 

If you're looking for 3mms of sound deadening material you could consider the C+L 3mm Foam underlay. I have used the 5mm version of that material (which I had lying around) on "The depot", and so far it seems to work well with the foamboard. (I say that, though, as someone with very little knowledge of baseboard construction issues!)

 

 

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buffalo

Hi Mikkel,

 

The bridge is not affected because the track is laid directly on the foam board. Underneath are Evergreen plastic linear and cross girders, so it is very stiffly braced.

 

I'm not worried about sound deadening so I was thinking of laying the track directly on the foam board on the other modules, though foam underlay might be worth considering. Would it be easy to cut out a V shape for the linear drainage channel usually associated with broad gauge track? How are you fixing it to the foam board base?

 

Now that you've hinted at some progress on "The Depot", when are we going to see it? :)

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  • RMweb Gold
Mikkel
  • RMweb Gold

Nick, actually I think it would be difficult to cut that groove neatly in the foam underlay. It's easy enough to cut straight, but a V shape would be tricky I think.

 

The first time I used the foam underlay I applied a special gooey glue for fixing carpets (which had been recommended to me - I forget the brand name), but on The depot I've just used normal white PVA to fix it to the foam board, and so far it seems fine.

 

I'm working on the roof structure for The depot at the moment, which involves tedious modification of various kits and bits, so nothing much to show just yet.

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