Feldbahnmodule with ship

[finescalerr]

Satisfactory, of course. -- Russ

[fspg2]

I continued with the machining of the four wheels.

After cutting through the retaining bars, I was able to continue machining the wheels on the lathe.

To do this, I turned the end of a 14.0mm brass round rod to 12.0mm, drilled a 1.6mm deep hole with a 5.0mm milling cutter and then milled it to a diameter of 6.0mm. This gave me a centric pocket for the 6.0mm collar of the wheels.
This was followed by a 1.8mm hole for a 2.0mm thread to secure the wheels.

Laufrad abdrehen 01 (fspg2)


This allowed me to bring the four wheels to the final dimension in three passes, one after the other. A dial gauge showed the exact depth.

Laufrad abdrehen 02 (fspg2)


The outer edges were slightly rounded with a small flat file.

Laufrad abdrehen 03 (fspg2)


After the second side of the wheel had also been rounded, the surface was treated with 1000 grit sandpaper and sanding fleece.


Laufrad abdrehen 04 (fspg2)

(a longer screw was used for this photo to show the assembly more clearly)

Then the wheels were changed.

Laufrad abdrehen 05 (fspg2)


Now the wheels just had to be sandblasted and burnished.

Laufrad abdrehen 06 (fspg2)

[finescalerr]

That looks so easy I'm sure anyone can do it with no practice! -- ssuR

[fspg2]

Hello,

@Russ
I have to agree with you  

The 3D drawing and the Münzel crane substructure assembled for testing are starting to look similar.

Münzelkran  Unterbau 17 (fspg2)


Münzelkran  Unterbau 18 (fspg2)


A few stiffening profiles and gusset plates are still missing.
As I unfortunately don't know any more details about the prototype, I'm using two old Hamburg harbor cranes as a guide, which I was able to photograph in Hamburg in 2007 and 2011.

Hamburger Hafenkran 33 (fspg2)


There will also be an anti-tipper, but I'm not yet sure what it should look like.
Perhaps as a double-T profile ending vertically just above the wheel tread....

Hamburger Hafenkran 31 (fspg2)



Hamburger Hafenkran 36 (fspg2)


Hamburger Hafenkran 38 (fspg2)


... or as in the following picture, which I kindly received from Gerald at the time.

Hamburger Hafenkran 39 (fspg2)

[finescalerr]

Your model looks better than the original. -- Russ

[Bernhard]

It's always a pleasure and inspiring to see your latest progress.

Bernhard

[Ray Dunakin]

I'm guessing the anti-tipper was to keep the crane upright if a wheel broke? Or is it to prevent stray items from ending up under the wheel?

[Stuart]

Your results are impressive.  You possess the skills of a clock or watch maker!

Stuart

[Barney]

Breathless again
Barney

[fspg2]

Thank you very much for your feedback!

@Ray
I'm guessing the anti-tipper was to keep the crane upright if a wheel broke? Or is it to prevent stray items from ending up under the wheel?
Your first assumption sounds sensible. However, these devices are only available on one side of each of the four wheels.
The anti-tip device was an unproven assumption of mine.
Apart from that, I have not been able to find any indication of what such a presumed anti-tipping device might have looked like, either in my own photos or those I found on the Internet. Only on the picture "Hamburger Hafenkran 33" the connection of the substructure with the movable crane housing can be recognized as a tube or round bar.
In addition to the centric alignment and the "actual tilt protection", the connecting tube (drawn in red) will be used to supply the power for my model.
The Münzel crane didn´t have a counterweight.

The assembly board originally shown for the crane's substructure did not prove to be practical. This meant that the outer cheeks with the cross plates and the brackets could only be soldered from above with the resistance solderer.

Drehkranz Sockel 04 (fspg2)



A pair of 3.0mm Pertinax mounting brackets now allow soldering on both sides. The 0.8mm nickel silver lateral plates were inserted at right angles into 0.85mm wide milled grooves.

Drehkranz Sockel 05 (fspg2)


Drehkranz Sockel 06 (fspg2)


Drehkranz Sockel 07 (fspg2)



One after the other, the two side panels were fixed to a base board with the help of small one-handed clamps and the soldering could begin.

Drehkranz Sockel 08 (fspg2)



Now to the power supply:
As it is a stationary model, all functions are controlled via six cables. It should also be able to rotate endlessly through 360° without the cables getting in the way.
Originally, I wanted to mill rings into a 1.5mm thick, copper-clad hard paper plate, which would be connected to the control unit from below. Similar to a printed circuit board F.C turntable from Fleischmann. This solution - installed inside the crane housing - would have been much bulkier and more complex to build.

Then I thought about building a similar solution using six wheel contact strips mounted on top of each other, which I found on the WWW. It is a much smaller, cheaper and easy-to-install alternative: a capsule slip ring with 6 grinding tracks and only 15mm diameter.

Kapsel Schleifring 01 (fspg2)


I'm curious to see whether it will actually be as inconspicuous as shown in the following animation

Kapsel Schleifring 02 (fspg2)

(In an enlargement you can see the details better without interference: 1st click on the picture, then 2nd click on the picture in the gallery  that has now appeared)

[Lawrence@NZFinescale]

The quality of your posts matches the quality of the model.

Wonderful as always!

[finescalerr]

Satisfactory. -- Russ

[Bernhard]

If I look at picture 08 correctly, the thing will be huge. You don't really realize that when you only see the individual parts. Impressive!

Bernhard

[fspg2]

Thank you all!

@Lawrence
That should be the norm 

@Bernhard
The base shown in picture 08 has the following dimensions: 263.7mm x 157.25mm x 44.45mm.
The scale of 1:22.5 is only 1.42 times larger than 1:32. After my change from 0-scale (1:43.5) to 1:22.5, it also seemed huge to me at first!  However, this is increasingly put into perspective - even now some parts seem quite small to me.

Since I have no further information about the interior of the Münzel harbor crane, I searched for old drawings on the WWW and found an interesting site with many drawings of old harbor cranes:

https://www.kran-info.ch/technik.htm


Antriebszahnrad 11 (fspg2)

Detail of a drawing from 1900 - found at: https://www.kran-info.ch/technik.htm


I based the assembly of the drive gear on the drawing above.

Antriebszahnrad 01 (fspg2)


Antriebszahnrad 05 (fspg2)



The 3.0 mm thick silver steel axle is ball-bearing mounted in a profiled brass tube.

Antriebszahnrad 07 (fspg2)


Antriebszahnrad 08 (fspg2)



I turned the profile part from a 14.0 mm MS58 bar.

Antriebszahnrad 09 (fspg2)


Antriebszahnrad 10 (fspg2)



As soon as the ordered spur gear (module 0.5 with 15 teeth) arrives, the holes for the 5.0 mm center hole and the six 0.8 mm fastening screws in the base plate of the crane housing can be drilled.


In the meantime, the capsule slip ring has already been positioned in the crane housing on a trial basi

Kapsel Schleifring 03 (fspg2)



The upper part, which is only 12.5 mm x 12.5 mm thick (instead of 15.0 mm x 15.0 mm in the description), is later screwed to the base plate.
 
Kapsel-Schleifring Montageansicht 01 (fspg2)


To prevent the part of the slip ring that can rotate through 360° from twisting after the crane housing has been mounted in the slewing ring base, I divided the inner guide tube into two sections at a 45° angle.
The lower tube section (colored green) is then glued into the outer guide tube of the base (colored red) with Loctite 648.
The upper part (colored yellow) is firmly glued to the lower rotatable segment of the slip ring.
The 45° bevel of the two pipe sections prevents the lower part from twisting.
However, the upper part of the crane can still be easily dismantled for maintenance.

Kapsel-Schleifring Montageansicht 02 (fspg2)

[finescalerr]

As we have seen here many times, it is almost impossible to avoid tiny parts in model building unless the scale is almost 1:1. -- Russ