Tag Archives: PVA glue

Sometimes you have to Double, Double Check

Remember that bridge I’m building?

Well, the first attempt looked pretty good, but…

When it comes to scenery and structures I’m pretty much of the school of If It Looks Right, It Probably Is Right.

So far, most of my layout building has been done by eye. No need for scales and engineering drawings.

However, I have used spirit- and laser-levels to set the bed of the permanent way, and checking for horizontal when positioning Boltorr Dam, and routing the access road. The access road does look a bit like an Ordnance Survey contour, and I’ll be relieving that a little. But that’s by-the-by.

When I made the final check of my first road bridge I found it had racked while the glue set. That is, twisted.

Unfortunately, this isn’t the age of Scotch glue – not that Scotch – animal glue – sorry vegans – or Seccotine – something for you piscatorians – so steaming or warming the modern PVA I used didn’t work.

Back to the drawing board.

All the component materials are much the same – 2mm MDF, foam-board, PVA, except that rather than gluing up the entire structure in one go and hoping for the best I’m completing one process at a time, letting it set, and then move onto the next.

Which is where I am now.

Diversion. When I was at grammar school, one of my first choices was “Latin” – sorry Fred Stacy – or “Woodwork“.

C’mon it’s difficult to be true to your roots.

Guess what I chose?

A lesson with “Woody” Worrell was a lesson in life. In the morning, come in, turn on the Scotch-glue-pot over the Bunsen Burner. In the afternoon, smell the dead animals boiling and rendering away in the glue-pot – still better than McDonald’s by a million miles. No really. But you know that, don’t you?

Anyway, we’d listen to the cricket on long-wave BBC from Droitwich. At the end of every lesson, he’d read a poem. Sorry Woody. I can’t remember any of them, but I know John Masefield and Rupert Brooks were in there, every time. Sometimes even Kipling. Thanks Woody. I mean that.

Then bus home, even if I wasn’t wearing my cap. Thanks, PGS.

Sorry. No Pictures of my abject failure. But I did win the school Woodwork Prize. Oh yes…
Just wait until my next posting…

Meanwhile in Dumnonia…

Bridge Building: I

Time to think about the road bridge over the tracks. This is going to serve as a scenic break so that the layout appears to run north-east all the way to Exeter.

I’m going back to the method I used for the tunnel portal to the south. For the basic structure I’ve used 2mm MDF. This is quite hard to source here. In the end I got mine from Am@zon, but it actually shipped from Sweden.

2mm MDF and foam-board
2mm MDF and foam-board
Aligning and levelling the bridge
Aligning and levelling the bridge

I made a template for the stonework of the bridge as described in another article and cut the front and the back of the bridge together so they would – hopefully – be identical. I used foam-board for the road plane and as internal braces to stabilise the structure. The whole lot is joined together with PVA glue.
The bridge in situ. There is space on the right for the platform to continue under the bridge
The bridge in situ. There is space on the right for the platform to continue under the bridge

I’ve applied foam-board and styrene strip to represent buttresses and some masonry embellishment. Only the layout side is going to be treated since the other side of the bridge won’t be visible.

Next step is to install the bridge liner and roof.