Feldbahnmodule with ship

[Bernhard]

Since you retired, the project has really taken off. Always inspiring to see.

Bernhard

[fspg2]

The most time-consuming part is not the soldering, but the rounding of the soldered wires on both sides.

The double bunker is soldered with 492 six to seven millimeter long pieces of 0.8mm MS58 wire cut at an angle. The bevel makes it easier to press the wire pins into the 0.8 mm holes in the gusset plates and L-profiles. As there are always four identical or mirrored diagonal braces, corresponding Pertinax templates are also helpful here.


Doppel-Bunker 24 (fspg2)


The downward-facing legs of the 2.5mm x 2.5mm L-profiles are inserted into the milled recesses. The 0.9mm holes are drilled 3.0mm deep to accommodate the wire pins.

Doppel-Bunker 25 (fspg2)



The four single and two double feet required for the eight vertical 5.0 mm x 5.0 mm L-profiles were milled from a leftover piece of Ureol®.

Doppel-Bunker 26 (fspg2)



In the following picture you can see the individual parts for the double bunker that have been completed so far.

Doppel-Bunker 27 (fspg2)



Actually, the two lower strut elements should already be soldered and the wire pins rounded on both sides...

Doppel-Bunker 23 (fspg2)


...as my stock of wire was running low, new ones were ordered. However, the ten meters of the 0.8mm wire I ordered were in the package as a 0.5mm version.
So we'll have to wait a little longer for the replacement delivery to arrive.

[finescalerr]

Adequately inspirational. -- Russ

[Bernhard]

I absolutely agree with Russ on that.

Bernhard

[Ray Dunakin]

This is like building the prototype in miniature, whereas "regular" modeling is imitating the appearance of the prototype using completely different materials and methods.

[fspg2]

In the meantime, the already soldered elements were burnished. In order to solder the individual parts together, the burnishing was removed again on both sides of the contact points with the glass eraser and brought together with soldering water and small pieces of solder wire one to two millimeters long and 0.5 mm thick. The resistor solderer went into action... It's always great that, unlike a soldering iron, the small rivet pins that had already been soldered beforehand kept a cool head.

Doppel-Bunker 28 (fspg2)



After the wire with the correct 0.8 mm diameter was quickly delivered free of charge, I started soldering the lower double diagonal bracing.

In the following picture, I have loosely assembled all the parts already made to check the fit.


Doppel-Bunker 29 (fspg2)



After the 78 soldered wire pins of the first lower diagonal brace were rounded on both sides, they were burnished again and the contact points were also exposed.

Doppel-Bunker 30 (fspg2)


The first half has now been soldered.

Doppel-Bunker 31 (fspg2)



Before the second half can come together, the next 78 wire ends must first be soldered........and so on .....

Doppel_Bunker_32 (fspg2)



Now the question will surely arise as to why I brown the individual parts first and don't wait until everything is soldered together.
The whole double bunker is simply too big to be browned evenly in all places in the immersion bath (within five minutes). This way, I can brush the individual pieces on both sides with an old toothbrush every now and then during the browning process and get an even color. It also allows me to better assess the state of browning and I don't have to painstakingly scrape out the brown "gloop" from small corners that may have formed due to prolonged exposure.

I will use a brush to selectively apply the browning to the areas where bare brass still flashes up at the end until the same shade of brown is achieved.                                     

[finescalerr]

Simply terrific. And quite beautiful. -- Russ

[Bill Gill]

Beautiful work through and through even on the 'incidental' smaller pieces

[Bernhard]

Excellent work. But the whole thing looks more like a spider's web than a framework. It's impressive that all the connections fit together.

Bernhard

[Ray Dunakin]

Simply amazing!

[fspg2]

The filigree base frame has now been completely soldered together and was given an intensive shower bath after bluing.

Doppel-Bunker 35 (fspg2)



When the whole model is later painted "iron gray" and some areas are scratched and damaged, I hope that the "rusty" primer will shine through under the peeling paint.

Doppel-Bunker 36 (fspg2)



Note: Click on the images to open the gallery. Click on the image that appears to enlarge it.
One click on thisimage and another click on the back button in the browser will take you back to the article!


Next comes the upper edge of the double bunker.

Doppel-Bunker 33 (fspg2)



Doppel-Bunker 34 (fspg2)



I milled a frame skeleton from 2.0 mm and 5.0 mm Pertinax plates for precise assembly when soldering the three 45° inclined and vertical rear sub-plates.

Doppel-Bunker 37 (fspg2)



This part is later glued to the bunker tray using a two-component adhesive.

Doppel-Bunker 38 (fspg2)


Now the soldering continues...

[finescalerr]

Your account of this project keeps getting better and more impressive with each new post. -- Russ

[Bernhard]

And as always, probably 50% of the working time is spent on the aids and jigs.

Bernhard

[Sami]

Everything is studied and carried out with precision.