Winter 2016 Challenge - Jim Botten - Breakheart Trestle

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This is for all registered members with access to the forum. (This is everyone who subscribes to Region Services).
Online modeling competitions and challenges will be announced here.
Members must report and document their modeling progress here.
Winners will usually be chosen by one of the following two (or a combination of the two)
-NMRA-BR BOD members
-Via a voting Poll on this forum by the membership.

At the end of each competition, the entries will be moved to the relevant modeling section to facilitate access of the general public.
jimbotten
Posts: 23
Joined: Wed Oct 05, 2011 1:53 pm

Re: Winter 2016 Challenge - Jim Botten - Breakheart Trestle

Post by jimbotten » Sun Mar 05, 2017 12:16 pm

A wodge of modelling-clay was then squeezed into shape, building-up around the foam-nail heads and respecting the lines marked out in pen.

Imagethumb_DSC01882_1024 by Jim Botten, on Flickr

And the bent finally fixed in place, glued at the top and wedged into the clay at the bottom. In the photo below you can see to the right the original bent made to the old-style design, which is still holding up the track, but due to be removed in due course.

Imagethumb_DSC01883_1024 by Jim Botten, on Flickr

And finally, a close-up of the modelling-clay as it dried out, marked up to represent the loose stone wall that can be seen in the still from the film “Breakheart Pass” (which is my “prototype”).

Imagethumb_DSC01884_1024 by Jim Botten, on Flickr

deanobeano
Posts: 66
Joined: Fri Oct 09, 2015 4:22 pm

Re: Winter 2016 Challenge - Jim Botten - Breakheart Trestle

Post by deanobeano » Mon Mar 06, 2017 8:42 pm

Hi Jim,

The wait has been worthwhile - the new Trestle and the clay formation at its base look superb - many more to go?

Kind regards

Dean
Dean Halls

jimbotten
Posts: 23
Joined: Wed Oct 05, 2011 1:53 pm

Re: Winter 2016 Challenge - Jim Botten - Breakheart Trestle

Post by jimbotten » Sat Mar 11, 2017 6:44 pm

In reply to Dean - too many more! Given that the last ten days of this month I shall be away celebrating our 20th wedding anniversary there's now no realistic prospect of this challenge being anywhere near complete by the time the final hooter sounds. If I'd stuck to the original (unrealistic) design and blithely steamed-ahead it might just have been possible. However, I'm not giving-up - I shall continue this "blog" (shudder) and continue to mark progress until the project is complete (it's a very good spur to action, I find). So watch this space, even beyond the end of March. (Below is the still from the film which I'm using as reference for the above bent and the next, where the footing comes wrapped in some sort of timber caisson. Hours of fun.)

Imagethumb_DSC01847_1024 by Jim Botten, on Flickr

jimbotten
Posts: 23
Joined: Wed Oct 05, 2011 1:53 pm

Re: Winter 2016 Challenge - Jim Botten - Breakheart Trestle

Post by jimbotten » Sat Apr 22, 2017 3:17 pm

The Challenge is over, but the challenge continues (and so do these up-dates, as promised). There has been quite a long gap in progress, partly down to holiday travels and various other domestic and social pleasures, but also because of a long and imaginative discussion with the “rivet-counters” of EarlyN about the best way to represent (or not) rivet/bolt-heads. Various 3D proposals have developed, but my ultimate decision is to go with a simple “impression” system, using the point of a 0.03mm Pentel pencil to indent and discolour a scale 2” sized dot at each (visible) appropriate point. The thinking behind this goes as follows: the closest any viewer will be able to get to the model trestle once it’s installed in its rightful place will be about 3 feet (480 scale feet) at which distance in the full-sized world the bolt-heads are invisible (see photographs), whereas a modelled 3D bolt-head (however microscopically modelled) would be all too obvious. However, there does need to be a feel of “something there”, which the impression system provides. (There’s also the fact that I couldn’t contemplate drilling the several thousand small holes and tweezering-in the several thousand small 3D objects which the 3D approach would require.)

Meanwhile I had completed constructing the second bent of “authentic” design and installed it to the left of the first such, using the same kind of model-clay technique; but this time with flat vertical surfaces which could then be clad in scale 12 x 12 timbers as per (more or less) the prototype (see reference photo at end of previous entry).

Imagethumb_DSC02006_1024 by Jim Botten, on Flickr

Imagethumb_DSC02009_1024 by Jim Botten, on Flickr

The original “inauthentic” bent was then surgically removed and the ground-cover made good around the base of the two authentic ones.

Imagethumb_DSC02011_1024 by Jim Botten, on Flickr

jimbotten
Posts: 23
Joined: Wed Oct 05, 2011 1:53 pm

Re: Winter 2016 Challenge - Jim Botten - Breakheart Trestle

Post by jimbotten » Sat Apr 22, 2017 3:30 pm

The cross-braces and girts were then measured, cut, glue-dabbed and tweezered into place, working from the top down and from the back to the front.

Imagethumb_DSC02010_1024 by Jim Botten, on Flickr

A fiddly job, but not as frustrating as I though it might be. Note that the dimensions for the rear-most set of parts are slightly smaller than those for the front face, because of the curved nature of the trestle. But they are consistent from the top to the bottom of each face, allowing for some handy mass-production. Lots of re-measuring and checking as I went along (and even then some wastage). But now I have my first complete “tower” (two bents and their connections)..!

Imagethumb_DSC02013_1024 by Jim Botten, on Flickr

I have been much struck by the strength and stability of the resultant construction, given the minute-ness of the glued overlaps and the fragility of the component timbers. It says much for the functionality of the prototype design!

This first “tower” has been completed just in time for me to go away with my wife on yet another week’s holiday, so there will be yet another long pause before the next instalment, but I am determined to keep going – and keep reporting. The third “authentic” bent has already been constructed, ready to take the place of the “surgically removed” one.

deanobeano
Posts: 66
Joined: Fri Oct 09, 2015 4:22 pm

Re: Winter 2016 Challenge - Jim Botten - Breakheart Trestle

Post by deanobeano » Sat Apr 22, 2017 8:30 pm

Looking good Jim, enjoy your holiday.

Kind regards

Dean
Dean Halls

jimbotten
Posts: 23
Joined: Wed Oct 05, 2011 1:53 pm

Re: Winter 2016 Challenge - Jim Botten - Breakheart Trestle

Post by jimbotten » Sat Jun 03, 2017 1:54 pm

There has been a further rather prolonged period of non-progress on the model, with social & domestic commitments as usual being to blame, including trips away. However, the third bent has now finally been installed, using much the same techniques as before. Since in this case there is no “ledge” for the footings, the base of the bent was secured in place by applying very small dabs of NoNails underneath the mud-cills, with any spaces around them then being filled with more small blobs of NoNails being dabbed into place on the end of a piece of scrap wood – then painted and worked-up with ground-cover etc.

Imagethumb_DSC02058_1024 by Jim Botten, on Flickr

Lessons learned as I’ve gone along: 1) make the groundwork around the base of the bent good before gluing the cross-braces and girts in place, and 2) there is a pattern to the way each vertical layer of cross-braces alternate their “back” and “front” components. The first photograph below is the (now rather paint-spotted) memory-jogger that I sketched-out to guide me in this process, which I realised only after more haphazardly completing the rear set of cross-bracing on my very first “authentic” tower. Thus the fronts of the two towers now complete are correct, and the incorrectness at the rear of one of them is (I hope) far from noticeable (see final close-up photo).

Imagethumb_DSC02060_1024 by Jim Botten, on Flickr

Imagethumb_DSC02059_1024 by Jim Botten, on Flickr

We are (of course) just about to go off for another weeks’ holiday, with subsequent “catch-up” time which will also be modelling-free, but at least thinking has already started around the fourth bent, which will be to the immediate right of the current group (being the longest of all those yet to make). Main self-debate here is about the form of the footing. Period and more recent photos of the prototype seem to show a simple earth-banking, while the clip from Breakheart Pass (falsely) implies a form of caisson using alternated logs rather than the solid walls of interlaced timbers common higher up. Somewhat also depends upon the (largely accidental) contours of my base landscape at any given point. So it’s good to have time to think.

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